John M. Murkin, MD, FRCPC

• Professor of Anesthesiology (Senate)
• Director of Cardiac Anesthesiology Research
• Schulich School of Medicine
• University of Western Ontario
• London, Ontario, Canada

The result is an increase in blood flow to the vulnerable areas of bone muscle relaxant 5859 generic carbamazepine 200 mg without prescription, preventing cell death and reducing the likelihood of osteonecrosis spasms constipation cheap carbamazepine 100 mg with visa. Because of the small number of patients involved spasms shoulder buy generic carbamazepine, further studies are necessary to confirm these results muscle relaxant drugs cyclobenzaprine discount carbamazepine 400 mg online. Twenty-eight patients with 44 necrotic hips were treated with percutaneous decompression and autologous bone marrow mononuclear cell infusion muscle relaxant name brands order 100 mg carbamazepine mastercard. Patients were followed up for a minimum of 2 years and evaluated for clinical and radiographic progression of the disease. In 2014, Houdek and colleagues189 reviewed the literature and published a report in which they concluded that using core decompression in conjunction with mesenchymal stem cell infusion in the form of bone marrow leads to improved pain and functionality and halts progression of osteonecrosis of the femoral head, potentially obviating the need for future invasive procedures such as total hip replacement. Corticosteroid use is the most common cause of osteonecrosis, and corticosteroid-induced osteonecrosis can be reproduced in animal models. The pathogenesis of osteonecrosis is multifaceted and is still not completely understood. Why is it that corticosteroid-induced osteonecrosis is more common in patients with certain underlying diseases and not in others Does osteonecrosis have a genetic or epigenetic basis, and is there a familial predisposition Common pathogenic mechanisms known to be involved in osteonecrosis include osteoblast/osteoclast survival and apoptosis, lipid metabolism, and coagulation abnormalities. To better appreciate the risk factors involved in osteonecrosis, a more complete understanding of the pathogenesis is necessary. Until then, the physician should always maintain a high index of suspicion for osteonecrosis whenever known risk factors are present, especially use of corticosteroids and alcohol. Mesenchymal Stem Cells Corticosteroids interfere with the balance of adipogenesis and osteogenesis in the differentiation of mesenchymal stem cells. Corticosteroids shunt uncommitted osteoprogenitor cells in the bone marrow into the adipocytic pathway, leading to reduced osteoblast formation. The balance between adipogenesis and osteogenesis has been targeted as a potential site for the treatment of osteonecrosis. The mesenchymal stem cells can be differentiated into osteocytic lineage in vitro. A pilot study evaluating the effectiveness of implantation of autologous bone marrow cells in the treatment of osteonecrosis used core decompression to implant stem cells into the necrotic lesions of the femoral head. The patients were divided into two groups-one that received core decompression alone as treatment for osteonecrosis (the control group) and one that received autologous bone marrow cell implantation along with core decompression (the treatment group). The patients were followed up for 24 months, and at that time, 5 of 8 hips in the control group, but only 1 of 10 in the treatment group, advanced to stage 3 osteonecrosis. Pelaz A, et al: Epidemiology, pharmacology and clinical characterization of bisphosphonate-related osteonecrosis of the jaw. Otto S, et al: Osteoporosis and bisphosphonates-related osteonecrosis of the jaw: not just a sporadic coincidence-a multi-centre study. Matsuo K, Hirohata T, Sugioka Y, et al: Influence of alcohol intake, cigarette smoking, and occupational status on idiopathic osteonecrosis of the femoral head. Orlic D, Jovanovic S, Anticevic D, et al: Frequency of idiopathic aseptic necrosis in medically treated alcoholics. Hernigou P, Galacteros F, Bachir D, et al: Deformities of the hip in adults who have sickle-cell disease and had avascular necrosis in childhood. Kemnitz S, Moens P, Peerlinck K, et al: Avascular necrosis of the talus in children with haemophilia. Radke S, Wollmerstedt N, Bischoff A, et al: Knee arthroplasty for spontaneous osteonecrosis of the knee: unicompartmental vs bicompartmental knee arthroplasty. Sugano N, et al: the 2001 revised criteria for diagnosis, classification, and staging of idiopathic osteonecrosis of the femoral head. The biology of osteonecrosis of the human femoral head and its clinical implications: I. Tian L, Wen Q, Dang X, et al: Immune response associated with Toll-like receptor 4 signaling pathway leads to steroid-induced femoral head osteonecrosis. Tian L, et al: Association of toll-like receptor 4 signaling pathway with steroid-induced femoral head osteonecrosis in rats. Israelite C, et al: Bilateral core decompression for osteonecrosis of the femoral head. Gangji V, et al: Abnormalities in the replicative capacity of osteoblastic cells in the proximal femur of patients with osteonecrosis of the femoral head. Miyanishi K, et al: Bone marrow fat cell enlargement and a rise in intraosseous pressure in steroid-treated rabbits with osteonecrosis. Feng Y, et al: Decreased in the number and function of circulation endothelial progenitor cells in patients with avascular necrosis of the femoral head. Saito S, Ohzono K, Ono K: Early arteriopathy and postulated pathogenesis of osteonecrosis of the femoral head. Pushalkar S, et al: Oral microbiota and host innate immune response in bisphosphonate-related osteonecrosis of the jaw. Wei X, et al: Molecular profiling of oral microbiota in jawbone samples of bisphosphonate-related osteonecrosis of the jaw. Results of core decompression and grafting with and without electrical stimulation. Hernigou P, Allain J, Bachir D, et al: Abnormalities of the adult shoulder due to sickle cell osteonecrosis during childhood. Kandzierski G, et al: Femur head necrosis in haemophilia and after prolonged steroid therapy-description of two cases. Axhausen G: Uber anamische Infarkte am Knochensystem und ihre Bedeutung fur die Lehre von den Primaren Epiphysionkrosen. Assouline-Dayan Y, Chang C, Greenspan A, et al: Pathogenesis and natural history of osteonecrosis. Sevitt S: Avascular necrosis and revascularisation of the femoral head after intracapsular fractures; a combined arteriographic and histological necropsy study. Gogas H, Fennelly D: Avascular necrosis following extensive chemotherapy and dexamethasone treatment in a patient with advanced ovarian cancer: case report and review of the literature. Haajanen J, et al: Steroid treatment and aseptic necrosis of the femoral head in renal transplant recipients. Otto S, et al: Osteonecrosis of the jaw: effect of bisphosphonate type, local concentration, and acidic milieu on the pathomechanism. Hirota Y, et al: Association of alcohol intake, cigarette smoking, and occupational status with the risk of idiopathic osteonecrosis of the femoral head. Axhausen G: Die Nekrose des proximalen Bruckstuckes beim Schenkelhals bruck und ihre Bedeutung fur das Huftgelenk. Antti-Poika I, Karaharju E, Vankka E, et al: Alcohol-associated femoral head necrosis. Murakami H, et al: A long-term follow-up study of four cases who underwent curettage and autogenous bone grafting for steroid-related osteonecrosis of the femoral condyle. Radke S, Wollmerstedt N, Bischoff A, et al: Knee arthroplasty for spontaneous osteonecrosis of the knee: unicompartimental vs bicompartmental knee arthroplasty. Hirohata S, Ito K: Aseptic necrosis of unilateral scaphoid bone in systemic lupus erythematosus. Van Poznak C: the phenomenon of osteonecrosis of the jaw in patients with metastatic breast cancer. Pathak I, Bryce G: Temporal bone necrosis: diagnosis, classification, and management. Plenk H Jr, et al: Histomorphology and bone morphometry of the bone marrow edema syndrome of the hip. Niibe K, Ouchi T, Iwasaki R, et al: Osteonecrosis of the jaw in patients with dental prostheses being treated with bisphosphonates or denosumab. Vyas S, Hameed S, Murugaraj V: Denosumab-associated osteonecrosis of the jaw-a case report. Discussion of the etiology and genesis of the pathological sequelae; comments on treatment. Ohzono K, et al: Intraosseous arterial architecture in nontraumatic avascular necrosis of the femoral head. Ichiseki T, Kaneuji A, Kitamura K, et al: Does oxidative stress play a role in steroid-induced osteonecrosis models Ichiseki T, Matsumoto T: Oxidative stress may underlie the sex differences seen in steroid-induced osteonecrosis models. Ichiseki T, et al: Oxidative stress by glutathione depletion induces osteonecrosis in rats. Tokuhara Y, et al: Low levels of steroid-metabolizing hepatic enzyme (cytochrome P450 3A) activity may elevate responsiveness to steroids and may increase risk of steroid-induced osteonecrosis even with low glucocorticoid dose. Hirata T, et al: ApoB C7623T polymorphism predicts risk for steroidinduced osteonecrosis of the femoral head after renal transplantation. Hirata T, et al: Low molecular weight phenotype of Apo(a) is a risk factor of corticosteroid-induced osteonecrosis of the femoral head after renal transplant. Kim T, et al: Promoter polymorphisms of the vascular endothelial growth factor gene is associated with an osteonecrosis of the femoral head in the Korean population. Soderman P, Malchau H: Is the Harris hip score system useful to study the outcome of total hip replacement Chiandussi S, et al: Clinical and diagnostic imaging of bisphosphonate-associated osteonecrosis of the jaws. Specchiulli F, Mele M, Capocasale N, et al: the early diagnosis of idiopathic femoral osteonecrosis. Beckmann J, et al: Precision of computer-assisted core decompression drilling of the femoral head. Zhao D, Xu D, Wang W, et al: Iliac graft vascularization for femoral head osteonecrosis. Pautke C, et al: Fluorescence-guided bone resection in bisphosphonate-associated osteonecrosis of the jaws. Trancik T, Lunceford E, Strum D: the effect of electrical stimulation on osteonecrosis of the femoral head. Kuribayashi M, et al: Vitamin E prevents steroid-induced osteonecrosis in rabbits. Biasotto M, et al: Clinical aspects and management of bisphosphonatesassociated osteonecrosis of the jaws. Graziani F, et al: Association between osteonecrosis of the jaws and chronic high-dosage intravenous bisphosphonates therapy. Kazakos K, et al: Knee osteonecrosis due to lead poisoning: case report and review of the literature. Govoni M, et al: Humeral head osteonecrosis caused by electrical injury: a case report. Vanderstraeten L, Binns M: Osteonecrosis of the femoral head following an electrical injury to the leg. Yamasaki T, Yasunaga Y, Hisatome T, et al: Bone remodeling of a femoral head after transtrochanteric rotational osteotomy for osteonecrosis associated with slipped capital femoral epiphysis: a case report. Irisa T, et al: Osteonecrosis induced by a single administration of low-dose lipopolysaccharide in rabbits. Mahachoklertwattana P: Zoledronic acid for the treatment of thalassemia-induced osteonecrosis. Strau G, Kainz L, Kienzer H: Spontaneous osteonecrosis of the knee joint in clinically suspected thrombosis of the leg veins. Yanagitani Y, Fujita M: Avascular necrosis of the femoral head associated with mucocutaneous lymph node syndrome. Seipolt B, Dinger J, Rupprecht E: Osteonecrosis after meningococcemia and disseminated intravascular coagulation. Epstein J, et al: Postradiation osteonecrosis of the mandible: a longterm follow-up study. Holler U, Petersein A, Golder W, et al: Radiation-induced osteonecrosis of the pelvic bones vs. Niewald M, et al: Risk factors and dose-effect relationship for osteoradionecrosis after hyperfractionated and conventionally fractionated radiotherapy for oral cancer. Balzer S, et al: Avascular osteonecrosis after hyperthermia in children and adolescents with pelvic malignancies: a retrospective analysis of potential risk factors. Gurkan E, Yildiz I, Ocal F: Avascular necrosis of the femoral head as the first manifestation of acute lymphoblastic leukemia. Classic clinical findings include "cauliflower ear" and "saddle nose" deformities. The disease may be primary or it may develop in association with other diseases, such as myelodysplasia, vasculitis, or other autoimmune/connective tissue disorders. Because of the multisystem nature of the disease, a broad approach to diagnosis and management is essential. Treatment is frequently empiric because of the wide variety of disease manifestations and lack of controlled trials. Peak age of onset is 40 to 50 years, but it has been described in children5 and in people older than 80 years. In healthy adults, turnover of cartilage components is slow, with incomplete repair processes. Noncartilaginous tissues may become involved, particularly those with an abundance of proteoglycans, such as the eye, inner ear, heart, blood vessels, and kidney. The severity of the inflammatory process frequently requires the use of immunosuppressive agents.

Most medical complications in these disorders result from orthopedic complications spasms perineum order genuine carbamazepine on-line, and they vary depending on the specific disorder muscle relaxant phase 2 block carbamazepine 200 mg buy amex. This causes knee or ankle pain in many individuals spasms leg carbamazepine 200 mg fast delivery, especially children muscle relaxer zoloft buy cheap carbamazepine 100 mg on line, and consideration should be made for correction by osteotomies spasms hamstring carbamazepine 400 mg order. Children and adults with skeletal dysplasias should have regular eye and hearing examinations because they are at increased risk for myopia, retinal degeneration, glaucoma, and hearing loss, depending on the disorder. Frequently, patients with these disorders have significant joint pain and, in some cases, joint limitations. Because most of these disorders result from mutations in genes critical to cartilage function, the cartilage at the joint surfaces may not provide adequate support and cushioning function. Last, weight control in adults with short stature is an ongoing issue and contributes to inactivity, loss of function, adult-onset diabetes, hypertension, and coronary disease. The majority of these individuals are of normal intelligence, have a normal life span, and lead independent and productive lives. The mean final height in achondroplasia is 130 cm for men and 125 cm for women, and specific growth charts have been developed to document and track linear growth, head circumference, and weight in these individuals. Clinically, these infants show central apnea, sleep apnea, profound hypotonia, motor delay, or excessive sweating. Other complications include upper airway obstruction, thoracolumbar kyphosis, and hydrocephalous in a small number of individuals. Craniofacial abnormalities lead to dental malocclusion, and appropriate treatment is necessary. As adults, the main potential medical complication is impingement of the spinal root canals, and this can be manifested by lower limb paresthesias, claudication, clonus, bladder, or bowel dysfunction. It is critical that these complaints are addressed because without appropriate decompression surgery, paralysis of the spinal cord can result. Biochemical and Molecular Abnormalities Based on clinical, radiographic, and histomorphologic similarities, skeletal dysplasias have been placed into bone dysplasia families. In recent years, there has been an explosion in our understanding of the basic biology of these disorders. This has resulted from advances in the human genome project that improved various methodology, including candidate gene approach, linkage analysis, positional cloning, human/mouse synteny, wholeexome and whole-genome analysis, allowing identification of the responsible disease genes (see Table 105-1). There are still skeletal dysplasias for which the disease-producing genes are unknown. Below are just some examples of the molecular mechanisms involved in the skeletal dysplasias. Both these disorders are associated with early-onset osteoarthritis, particularly of the hips and the knee, leading to joint replacements in many individuals in early adulthood. Mutations that result in a substitution for a triple-helical glycine residue appear to be the most common type of mutation. The explosion in delineating molecular defects has shown the complexity of cartilage as a tissue and the large number of cellular processes necessary for a normal skeleton. Because there is enormous clinical variability in these types, the subtypes will be discussed separately (Table 105-2). However, these disorders all share the same phenotypic finding of hypomineralization of the skeleton, although interesting bone quality is associated with overbrittleness. Individuals usually have mild short stature for their age or their unaffected family members, but are not as severe as seen in the other forms. The disorder is autosomal dominant, and in many cases, the individual is the first affected in their family. Other reported ocular defects include scleromalacia, keratoconus, and retinal hemorrhage. The enamel is normal, but the dentin is dysplastic; chipping of enamel occurs, and the teeth are subjected to erosion and breakage. During the second and third decades of life, a characteristic high-frequency sensorineural or mixed hearing loss can be detected. Mildly affected patients may not have fractures at birth, although there is occasionally a fracture of a clavicle or extremity during delivery. Radiographically, affected new- borns have wormian bones seen on lateral views of the skull, with significant osteopenia seen through the skeleton, especially the spine. In general, these patients may experience 5 to 15 major fractures before puberty, as well as several minor traumatic fractures of the digits or the small bones of the feet. Characteristically, the fracture rate falls dramatically after puberty, only to increase during later life. Osteopenia is observed in vertebral bodies and the peripheral skeleton and progresses with age. Although osteopenia with rarefaction of the medullary space and cortical thinning are observed in radiographs, many type I cases are so mild as to be missed on routine radiographic examination. Most cases result from sporadic mutations, however, recessively inherited forms of the disease has recently been documented. Radiographic features include wormian bones, multiple fractures, crumbled bones and characteristic beading of the ribs caused by healing callus formation. Molecular Pathology Most cases occur de novo as new dominant mutations; however, autosomal recessive forms have been established, as has recurrence based on germline mosaicism. Bone collagen fibers are thinner than normal, and at the intra-cellular level type I collagen in retained within dilated endoplasmic reticulum. Recessive form accounts for a small number of these cases and the involved genes are listed in Table 105-2. This modification of a single residue is thought to stabilize the collagen helix, although the mechanism of disease production is probably much more complicated, and this complex may act as a chaperone complex. The extent of growth retardation is remarkable, and in many adults the height may not surpass 3 ft (90 to 100 cm). Abnormal cranial molding occurs in utero and during infancy, producing frontal bossing and a characteristic triangular-shaped facies. Radiographically, wormian bones and delayed closure of the fontanelles may be observed well into the first decade. Pulmonary function can be diminished because of distortion of the spine and thorax and can progress with time and lead to restrictive lung disease and sleep apnea. Respiratory compromise develops in many patients with scoliosis greater than 60 degrees, creating a need for pulmonary investigations. Platybasia resulting from soft bone at the base of the skull may cause the external ear canals to slant upward while the base of the skull sinks on the cervical vertebrae. This distortion may lead to communicating or obstructive hydrocephalus, cranial nerve palsies, and upper and lower motor neuron lesions. Headache, diplopia, nystagmus, cranial nerve neuralgia, decline in motor function, urinary dysfunction, and respiratory compromise are complications of basilar invagination. Severe hearing impairment occurs in 10% of patients, although milder degrees of hearing loss are more common. The skeleton in these patients has significant osteopenia, leading to multiple fractures in the upper and lower extremities and vertebral bodies, particularly before puberty. Radiographs of the skeleton reveal marked osteopenia, thinning of cortical bone, narrowing of the diaphysis, widening of the metaphysis, which merges into a dysplastic epiphyseal zone filled with whorls of partially calcified cartilage. Many of the individuals become wheelchair bound at an early age or walk with mechanical assistance. These mutations are glycine substitutions scattered through the triple helix, as well as in-frame deletions. Fractures are rarely at birth, and some patients may not have the initial fracture until later in the first decade. Most fractures occur during childhood and may reoccur during the post-menopausal period in women or in men older than age 50 years. Radiographs of the long bones and vertebral bodies demonstrate marked osteopenia with vertebral collapse. Although there is marked cortical thinning, bowing, and coarsening of trabeculae, the overall architecture of the bone is normal. The list includes administration of mineral supplements, fluoride, androgenic steroids, ascorbic acid, and vitamin D. During the last 15 years, bisphosphonates administered parenterally to children has demonstrated favorable results. The effect is most marked in the spine, where vertebral remodeling may improve vertebral height. The currently recommended treatment regimen includes the use of a bisphosphonate with adequate calcium and vitamin D supplementation to avoid the occurrence of hypercalciuria and to maintain serum vitamin D levels within normal limits. Surgical stabilization is most advisable in the teen years or early adulthood when patients are best able to tolerate these complex reconstructions. Total joint arthroplasty is usually successful in these patients, thus referral is appropriate. Muscle-strengthening exercises are essential as primary care and after immobilization for fracture. Undermineralization and overmineralization of bone have been recognized within the same specimen. The most cardinal feature of these disorders is the presence of joint hypermobility, associated with an increase in skin elasticity and skin fragility. Thus it is critical that hyperextensibility be defined, and differentiating mild "normal" laxity from hyperextensibility can be challenging. Passive dorsiflexion of the fifth digit beyond 90 degrees = one point for each hand 2. Passive apposition of the thumbs to the flexor surface of the radius = one point for each hand 3. Flexion of the trunk forward so that the palms are placed flat on the ground = one point A score of five or more points is defined as joint hypermobility. Large-joint hyperextensibility is seen in varying degrees in the classic form and decreases with age. They may have large, lax ears, and traction on the ears or elbows reveals skin hyperextensibility. Thin, atrophic corrugated and hyperpigmented scars are found on the forehead, under the chin, and on the lower extremities (known as cigarette paper or papyraceous scars), although this is not a uniform finding. Although many patients claim to bruise easily, ecchymoses distributed on the extremities are found only in patients with the more severe forms of the disorder. Because of the extent of joint laxity affecting both large and small joints, these patients experience multiple dislocations and may require surgical repair. The shoulders, patellae, and temporomandibular joints are frequently sites of dislocation. Musculoskeletal pain may mimic that of the fibromyalgia syndrome, and patients frequently seek medical attention for symptoms consistent with chronic pain. One of the difficulties in this subtype is differentiating it from benign hypermobility syndrome. Benign hypermobility syndrome was used to describe patients with generalized joint laxity, associated musculoskeletal complaints, but normal skin. Many of these patients are seen in their twenties and thirties with rheumatologic symptoms that can pose problems in diagnosis and treatment. It is associated with arterial rupture, commonly involving iliac, splenic, renal arteries, or the aorta, and resulting in either massive hematomas or death. Patients with this disorder are also susceptible to rupture of internal viscera and may experience repeated rupture of diverticula on the antimesenteric border of the large bowel. Problems with pregnancy vary from pre-term delivery to uterine or vascular rupture, although delivery is uneventful in many instances. These patients have thin, soft, transparent skin, through which a prominent venous pattern is seen, especially on their chest walls. These individuals have characteristic thin faces, prominent eyes, and extremities that lack subcutaneous fat, giving the appearance of premature aging. Anesthetic and surgical difficulties related to intubation, spontaneous arterial bleeding during surgery, and the ligation of vessels that tear under pressure complicate surgical maneuvers. Imaging studies may reveal normalappearing aorta or other large vessels that rupture shortly after a "normal study. Optimal surveillance of these patients, particularly for vascular adverse events, has not been determined. Supportive therapy, however, is essential for preservation of normal joint function and alleviation of joint pain. Planned exercise programs and muscle-strengthening exercises are useful and do much to maintain a positive outlook in these individuals, who may have a poor prognosis if joint stability and articular surfaces are compromised by excessive activity or chronic trauma. Unfortunately, many children and young adults with large joint hypermobility are attracted to activities such as gymnastics and dance, and these activities promote hypermobility and joint damage. The presence of multiple ecchymoses raises concern about a bleeding diathesis, particularly at the time of elective surgery. In our center, we discourage pregnancy in patients with the vascular form, because the mortality rate is increased. These patients experience multiple dislocations, particularly involving large joints, including the hips, knees, and ankles. These dislocations often present in the newborn period, especially at the hips and ankles. Patients frequently need orthopedic surgery for their joint dislocation, and their tissues are highly friable, which complicates orthopedic procedures. The consequence of deficient hydroxylysine content of collagen is the effect it has on cross-linking, which helps stabilize the mature collagen molecule. Although the most impressive findings are relative to the musculoskeletal, cardiac, and ocular findings, affected individuals also suffer from pulmonary, neurologic, and psychological complications. Marfan syndrome has also become one of the few genetic disorders for which there has been advocacy for treatment to slow the progression of the disease. Physicians need to recognize the phenotype because many of the affected individuals are seen with life-threatening emergencies.

Poor prognostic factors in bacterial joint infection include old age muscle relaxant eperisone hydrochloride carbamazepine 200 mg generic, underlying rheumatoid arthritis spasms going to sleep order carbamazepine 100 mg on line, and infection in a prosthetic joint muscle relaxant wiki buy discount carbamazepine on-line. Late prosthetic joint infections require antibiotic treatment directed at the isolated microorganism and the complete removal of the infected prosthesis before reimplantation of a new prosthesis in a one-stage or two-stage operation muscle relaxant lodine carbamazepine 100 mg sale. Reducing the risk of a prosthetic joint infection involves a thorough pre-operative evaluation spasms purchase 400 mg carbamazepine otc, peri-operative use of antibiotics, and the careful use of antibiotic prophylaxis when a patient with a prosthesis is exposed to transient bacteremia. Clinical evidence does not support the use of antibiotic prophylaxis for most dental procedures. Most cases of septic arthritis result from hematogenous seeding of the synovial membrane. The abundant vascular supply of the synovium and the lack of a limiting basement membrane allow organisms to target joints during bacteremia. Table 109-1 lists the common organisms that cause joint infections according to the age of the patient and whether the joint is native or prosthetic. Since the introduction of the Haemophilus influenzae type B vaccine, the incidence of septic arthritis caused by H. Pseudomonas aeruginosa and Candida are potential pathogens in adolescent intravenous drug abusers. Patients with sickle cell anemia are prone to Salmonella arthritis, and immunocompromised children are at higher risk for infection with Gram-negative bacilli. The organisms causing nongonococcal septic arthritis in adults are 75% to 80% Gram-positive cocci and 15% to 20% Gram-negative bacilli. Staphylococcus epidermidis is common in prosthetic joint infections but is a rare cause of native joint infections. Staphylococcus lugdunensis is a unique coagulase-negative Staphylococcus that can cause infection in prosthetic and native joints (particularly following arthroscopy). Patients with non­group A streptococcal disease often have comorbidities such as immunosuppression, diabetes mellitus, malignancy, and severe genitourinary or gastrointestinal infections. Patients predisposed to Gram-negative bacillary infections include patients with a history of intravenous drug abuse, very young and very old patients, and immunocompromised patients. Predisposing factors include wound infections, joint arthroplasty, and immunocompromised hosts. Anaerobes and coagulase-negative staphylococci are more common in prosthetic joint infections. Polyarticular (two or more joints) septic arthritis is much less common than monoarticular infection. Involvement of more than one joint also can occur in certain patient populations such as neonates and patients with sickle cell anemia, or with certain organisms, such as N. Among five reported cases, the knee was affected in four cases (bilaterally in two); the elbow and wrist were affected in three cases, and the shoulder was affected in two cases. Bacteremia was present in all but one case (80%) and always involved the same organisms that were in the synovial fluids. Most bacterial species isolated were the usual organisms seen in septic arthritis. A characteristic of most cases (80%) was the extension of locally destructive processes as a result of the contiguous spread of infection from the affected joints, such as osteomyelitis, fasciitis with compartment syndrome, and abscess or sinus tract formation. Systemic complications, including septic shock, multiorgan failure, and toxic shock syndrome, were noted in 60% of cases. The mortality rate of polymicrobial, polyarticular septic arthritis in this small series was 60%. Septic arthritis after joint aspiration and injection is extremely rare, occurring in 4 cases per 10,000 injections. In rare cases of septic arthritis of the knee related to anterior cruciate ligament repair, the tissue allografts were identified as the source of the infection. Lipo-oligosaccharide is a gonococcal molecule similar to lipopolysaccharide of other Gramnegative bacteria and possesses endotoxin activity, which contributes to the joint damage seen in gonococcal arthritis. Gene knockout experiments in animal models showed that the gene coding for the protein that binds collagen is an important virulence factor for S. Disruption of the respective genes, fnbpA and fnbpB, by knockout gene experiments completely obliterates adherence of S. When the cells have attached to tissue or an orthopedic device and have passed from the exponential to stationary phase of growth, agr represses the expression of genes coding for cell surface proteins and activates genes coding for exotoxins and tissue-destroying exoenzymes. Because of this complex effect on the different stages of infection, inhibitors of agr may reduce tissue destruction but enhance tissue colonization. This effect could have implications for chronic infections such as occur with prosthetic joints. Many of the cell surface proteins are regulated by the agr locus (see text in Pathogenesis section). At low cell concentrations, agr facilitates the production of the cell surface proteins, which facilitate attachment to tissue. At higher cell concentrations, as occurs with establishment of infection, agr downregulates production of the cell surface proteins and activates genes coding for exotoxins. After adherence to the joint tissue, the bacteria activate the host immune response. Protein A interferes with binding of complement by binding to the fragment crystallizable (Fc) portion of immunoglobulin (Ig)G. Protein A has been termed a superantigen for B cells because 30% of human B cells show Fab-mediated binding of the protein A molecule. The gene coding for protein A had been experimentally disrupted, and joint infection caused by the altered strain in a mouse model resulted in less joint destruction than infection caused by the wild-type strain. The stimulated T cells initially proliferate but later disappear, likely because of apoptosis, and result in immunosuppression. A late cytokine response may amplify the destructiveness of an established infection. In adults, the knee is involved in more than 50% of cases; hip, ankle, and shoulder infections are less common. Clearance of gonococcal infection is dependent on a potent complementmediated immune response. Individuals with terminal complement (C5-8) deficiency are at greater risk for infection. Blood cultures are frequently positive, whereas synovial fluid cultures are rarely positive. Patients have purulent arthritis, most commonly of the knee, wrist, or ankle, and more than one joint can be infected simultaneously. Arthrocentesis and synovial fluid analysis should be performed in patients who are seen with an inflamed joint for which alternative explanations are not immediately apparent. For example, a patient with a history of gout or evidence of a generalized flare of rheumatoid arthritis might not require arthrocentesis. However, the clinician should follow up carefully and reassess for an infectious process if the decision is made to treat for a diagnosis other than infection. For joints that are deep and more difficult to aspirate, ultrasound-guided or fluoroscopy-guided needle aspiration should be done. The protein concentration is approximately onethird that of plasma, and the glucose concentration is similar to that of plasma. Synovial fluid levels of glucose, lactate dehydrogenase, and total protein have limited value in the diagnosis of septic arthritis. Although a low synovial fluid glucose (<40 mg/dL or less than half the serum glucose concentration) and an elevated lactate dehydrogenase suggest bacterial infection, they are not sufficiently sensitive or specific for the diagnosis. In patients not previously treated with antibiotics, synovial fluid cultures are positive in 70% to 90% of cases of nongonococcal bacterial arthritis. In children, septic arthritis usually is accompanied by fever, malaise, poor appetite, irritability, and progressive reluctance to use the affected limb. Physical examination typically reveals warmth and tenderness of the affected joint, joint effusion, and limited active and passive range of motion. Women are more commonly affected because they are more likely to have asymptomatic and untreated primary infections. Bacterial dissemination has been associated with intrauterine devices and has occurred during menstruation, pregnancy, and pelvic operation. Septic arthritis is less likely but still possible Pigmented villonodular synovitis Hemarthrosis Neuropathic arthropathy synovitis after injection of hylan *Extremely inflammatory synovitis with negative culture is referred to as pseudoseptic arthritis. Crystals using polarized light microscopy ­ + Inflammatory arthritis not due to crystals Gout or pseudogout Gram stain and/or culture positive Gram-positive cocci are identified in 50% to 75% of synovial fluid Gramstained smears, but Gram-negative bacilli are identified less than 50% of the time in culture-proven cases. It is postulated that cytokines and endotoxins released from bacteria inhibit conversion of procalcitonin to calcitonin. Therefore procalcitonin elevations may occur in post-thyroidectomy patients who have a bacterial infection. A meta-analysis of studies on the use of procalcitonin for the diagnosis of septic arthritis recommended that procalcitonin be used as a rule-in test at the cutoff value of 0. The organism can often be easily recovered from other sites, such as urethral, cervical, rectal, or pharyngeal specimens. Inoculating blood culture bottles with 5 to 10 mL of joint fluid or smaller volumes into isolator tubes may increase the yield of positive cultures beyond that of standard techniques. Radiographs often show nonspecific changes of inflammatory arthritis, including periarticular osteopenia, joint effusion, soft tissue swelling, and joint space loss. In more advanced infection, periosteal reaction, marginal or central erosions, and destruction of subchondral bone may be seen. Dislocation or subluxation of the femoral head is unique to hip infection of neonates. Ultrasound can be similarly used in other joints, such as the popliteal cyst of the knee, shoulder, acromioclavicular, or sternoclavicular joints. Triple-phase bone scan using technetium 99m is often done in children to identify an associated metaphyseal osteomyelitis or avascular necrosis of the femoral head. Whole-body bone scan is preferred in young children because, despite focal symptoms, septic arthritis and osteomyelitis may be multifocal in this age group. Bone scans provide only nonspecific information, however, and cannot differentiate septic from noninfectious causes of joint inflammation. Bone scans are more sensitive than standard radiography in the diagnosis of arthritis because radionuclide uptake precedes morphologic bone changes that are seen on radiograph. A suggestive bone scan must be interpreted in the proper clinical context and supported by microbiologic data for a definitive diagnosis of joint or bone infection. These images can show early bone erosion, reveal soft tissue extension, and facilitate arthrocentesis of joints such as shoulders, hips, acromioclavicular,64 sternoclavicular, sacroiliac, and facet joints of the spine. When multiple joint involvement is suspected, triple-phase bone scintigraphy is the preferred modality of investigation. A serious clinical suspicion of a joint infection warrants the initiation of empiric antibiotic therapy before culture confirmation is available. Delays in treatment allow the infection to become more established in the joint and permanently damage the articular cartilage. Untreated, there is the opportunity for the joint infection to spread to other body sites via the hematogenous route and become more widespread and more difficult to cure. The principles of treatment of an infected joint, whether natural or prosthetic, follow those of treatment of an infected body cavity in which antibiotics must be used in conjunction with adequate drainage of the infected closed space. The clinical circumstances and the preliminary laboratory data aid the selection of antibiotic agents. Host factors, any extra-articular sites of infection, and the Gramstained smear of the synovial fluid are the best early guides for the antibiotic agents with which to start. Table 109-5 lists current antibiotic agents for adults,53 and Table 109-6 lists agents for children. Appropriate monotherapy in this case may be a penicillinase-resistant penicillin or vancomycin if methicillin resistance is likely. If Gram-negative bacilli are noted in the synovial fluid, and the patient has a kidney infection, specific agents. In healthy, young, sexually active individuals with community-acquired septic arthritis and a negative synovial fluid Gram-stained smear, ceftriaxone is a reasonable option to cover N. If synovial fluid Gram stain shows Gram-positive cocci, vancomycin should be the empiric therapeutic option, considering the fact that a significant proportion of community-acquired S. If patient is penicillin allergic, alternatives include vancomycin (40 mg/kg/day divided into four doses) or clindamycin (20-40 mg/kg/day divided into four doses). In elderly debilitated patients or adults with low risk for sexually transmitted disease as well as a negative Gramstained smear of synovial fluid, broad antibiotic coverage against a wide variety of organisms, including S. When the identity and the sensitivities of the organism are known, antibiotic therapy should continue with the most efficacious agent that has the best safety profile and narrowest spectrum. The parenteral route of antibiotic administration is the preferred initial treatment. Continued antibiotic therapy may be switched to oral agents if adequate blood levels can be achieved and maintained by this route. There is no evidence that the direct intra-articular instillation of drugs is necessary or preferable in septic arthritis because there is no barrier against the free diffusion of antibiotic agents from the blood to the synovial fluid. In cases in which uncertainty exists, serum and synovial fluid levels of antibiotic drugs can be measured to ensure that therapeutic levels are reached. Most penicillins, cephalosporins (excluding ceftriaxone), and carbapenems (excluding ertapenem) have short half-lives necessitating frequent dosing. These drugs, because of high protein binding, may not be appropriate for morbidly obese patients.

Local kidney spasms after stent removal cheap carbamazepine 400 mg with amex, state muscle spasms 9 weeks pregnant generic carbamazepine 200 mg amex, and national data are extremely expensive to collect and even more expensive to ensure they are reliable and accurate muscle relaxant 503 purchase carbamazepine 100 mg amex. As a result muscle relaxant natural remedies generic carbamazepine 400 mg on-line, funding for registry or database initiatives is often hard to come by muscle relaxer kidney pain purchase carbamazepine 400 mg on-line, and those resources supported by federal dollars are ever at risk for budget cuts. However, these data are incredibly important, forming the cornerstone for injury prevention, identifying areas in which additional research is needed, and pointing out where advocacy efforts are necessary. In summary, injury imposes a heavy burden on society in terms of both mortality and morbidity along with its sizable economic burden on the health care system and society. Largely unrecognized is the fact that many fatal and nonfatal injuries are preventable using specific strategies guided by the analysis of injury epidemiology. Yet, these diseases contribute much less to the burden of public health disease than do injuries. The majority of injury deaths are unintentional, with elderly people at a particularly high risk of death from unintentional injuries. Considering intentional injuries, overall, suicide greatly exceeds homicides, but rates again vary by age, gender, and urban or rural residence. In total, injury deaths declined slightly during the 2002­2010 period with significant variation by mechanism of injury. All causes are declining with the exception of fallrelated deaths, which are increasing significantly. Injury morbidity rates have demonstrated declining trends among all age groups except the elderly. Although certain assumptions or "profiling" may arise from the association of injury and certain mechanisms thereof, a number of confounding factors unrelated to racial origin have been outlined, which should dissuade broad generalizations that are unfounded. Alcohol and other drugs continue to be intimately associated with all types and mechanisms of injury. In conclusion, although significant strides have been made in reducing the rate at which injury occurs, trauma remains Chapter 2 Injuries in the United States, 2004 1. More efficient ways of treating injuries as they occur, or tertiary prevention, should and will continue to be the major thrust of clinical care providers and researchers. However, it is equally and perhaps more important that efforts to develop appropriate programs and policies that will prevent them from occurring also be prioritized. Education of policy makers and the public that this public health epidemic can and must be controlled is an essential component of this effort. Accurate, easily obtainable and understandable data is a key first step in this process. Studying the epidemiology of injuries provides the opportunity for understanding how, when, and with whom to intervene. The sickness impact profile as a tool to evaluate functional outcome in trauma patients. Epidemic increases in cocaine and opiate use by trauma center patients: documentation with a large clinical toxicology database. Healthcare Cost and Utilization Project, Agency for Healthcare Research and Quality. National Highway Traffic Safety Administration Crash Injury Research and Engineering Network. The National Violent Death Reporting System: an exciting new tool for public health surveillance. National Violent Death Reporting System, Centers for Disease Control and Prevention. Department of Transportation, National Highway Traffic Safety Administration; 1996. The changing approach to epidemiology, prevention, and amelioration of trauma: the transition to approaches etiologically rather than descriptively based. The epidemiology of trauma-related mortality in the United States from 2002 to 2010. Trauma deaths in a mature urban trauma system: is "trimodal" distribution a valid concept San Francisco: Institute for Health and Aging, University of California and the Injury Prevention Center, the Johns Hopkins University; 1989. Manual for the International Statistical Classification of Diseases, Injuries, and Causes of Death, Based on the Recommendations of the Tenth Revision Conference, 1975. Trends in alcohol and other drugs detected in fatally injured drivers in the United States, 1999­2010. The Barell Injury Diagnosis Matrix, Classification by Body Region and Nature of the Injury. The Global Burden of Disease Study, which creates a unique framework by which to assess national trends in all-cause and cause-specific mortality and morbidity, has shed light on the burden of injury relative to the denominator of all morbidity and mortality. Injury has begun to gain recognition as a prominent public health issue as thought leaders, researchers, and clinicians are vigorously studying the issues within a framework by which prevention efforts, trauma systems, and advocacy strategies can be developed and maintained. As a consequence of inadequate surveillance in many parts of the world, that number is likely to be much higher. The impact is projected to increase over time relative to other leading causes of death (Table 3-1). In several ways the burden and demographics of injury in the United States provide an example of the patterns seen worldwide; that is, injury is most prevalent in communities of lower socioeconomic status, rates of injury are higher in men than women, and young people are disproportionately affected by injury. According to the Centers of Disease Control and Prevention, unintentional injury remained the leading cause of death in the United States from age 1 to 44 years in 2013. Unintentional injury, suicide, and homicide are the first, second and third leading causes of death in the age group 15­34 years, respectively. Homicide remains the leading cause of death in the United States in African-Americans 15­34 years old and second in Hispanics of the same age. Unintentional injury is the third leading cause of death of all Americans with motor vehicle crashes and falls, particularly in the elderly, having a significant impact. To round out the picture of the impact of injury, cost should be taken into consideration. Indirect costs, including the psychological impact, loss of productivity affecting entire families, and societal costs of injury are more difficult to calculate, but we have a growing understanding of their magnitude. Road traffic injuries alone cost most countries 1­2% of their gross national product. In the United States, hospitalization alone for injury exceeded $80 billion in direct costs and $150 billion in lost wages in 2010. Understanding the global, national, and local impact of injury by mechanism and demographics is a critical start to launching into a strategy of targeted injury prevention appropriate for a particular location and population. In addition, understanding the public health impact of injury allows targeted advocacy for legislation and financial resources necessary to initiate many prevention plans. Understanding the direct and indirect costs of injury creates opportunities to conduct studies in cost-effectiveness, a compelling tool when advocating for prevention measures in an environment of limited resources. One-third to one-half of trauma deaths still occur in the field before any possibility of treatment even by the most advanced trauma treatment system. In terms of severely injured persons who survive long enough to be treated by prehospital personnel, very few "preventable deaths" occur in a modern trauma system with a well-run emergency medical system and designated trauma centers. Even among those who survive to reach the hospital, a significant portion of in-hospital deaths are directly related to injuries to the brain and occur despite optimal use of currently available therapy. In one study, out of 753 consecutive deaths, over 50% were deemed possibly preventable only by prevention efforts, with only 13% due to pulmonary embolus, multiorgan failure, and sepsis. Moreover, prevention efforts can also decrease the severity of injuries and thus the likelihood of disability that arises after trauma. This chapter provides the historic and scientific framework by which prevention efforts are implemented today. Although the list is not comprehensive, topics that cover both unintentional and intentional injury and site strategies that represent best practices and some newer promising practices in the United States are discussed. Many of these practices have evaluation and cost-effectiveness built in from program inception and stand as examples of the scientific principles presented in the chapter. This includes injury as it affects low and middle-income countries and developing strategies in surveillance, prevention and injury control necessary to make a difference amongst populations at greatest risk. This limited perspective resulted in an unaggressive approach to injury prevention of restricted scope that had little effect. Over the last 100 years, several visionary individuals had successive insights that established the public health basis for injury prevention. These frameworks resulted in a rational approach that now guides effective injury prevention. In 1916, a volunteer pilot in the Canadian Royal Flying Corps named Hugh DeHaven was on his final training flight when his plane collided with another and fell 500 ft to the ground. By applying engineering principles to injury events, DeHaven created the biomechanical foundation for injury that ultimately led to the development of automotive safety belts. Just like any other condition affecting human health, Gordon explained that injuries were not random, but occurred with recognizable patterns across time and populations. This would allow injuries to be studied from several perspectives and opportunities for prevention identified. An example of a host factor in the pre-injury phase would be alcohol impairment, agent factors could include brakes or maintenance, while an environmental factor could be road condition. Prevent the creation of the hazard; pre vent the development of the energy that would lead to a harmful transfer 2. Modify the rate or spatial distribution of the release of the hazard from its source 5. Separate in time or space the hazard being released from the people to be protected 6. Modify the basic structure or quality of the hazard to reduce the energy load per unit area 8. Make what is to be protected (both living and nonliving) more resistant to damage from the hazard Post-event 9. Stabilize, repair, and rehabilitate the damaged object Emergency medical care Acute care, reconstructive surgery, physical therapy Seatbelts, airbags Separation of vehicular traffic and pedestrian walkways Protective helments Breakway roadside poles, rounding sharp edges of a household table Fire and earthquake resistant buildings, prevention of osteoporosis. Prevent manufacture of certain poisons, fireworks, or handguns Reduce speed of vehicles Placing a trigger lock on a gun Strategy Example the probability that the event (ie, car crash) will result in an injury, and if so, to what extent. A host factor during the event could be seatbelt use, an agent factor might be crush resistance of the car, and an environmental factor could be the presence or absence of dividers that would keep the car from ricocheting into ongoing traffic. In the post-event phase, these three components (host, agent, and environment) can be evaluated for factors that influence the ultimate consequences of injury. This conceptual framework was further leveraged by Haddon to develop 10 strategies that formed the foundation of most current injury prevention and control efforts (Table 3-4). Principles of Injury Prevention Most interventions can be thought of as either being active or passive on the part of the person being protected. Active interventions involve a behavior change and require people to perform an act such as putting on a helmet, fastening a seatbelt, or using a trigger lock for a handgun. Passive interventions require no action on the part of those being protected and are built into the design of the agent or the environment, such as airbags or separation of vehicle routes and pedestrian walkways. Passive interventions are generally considered more reliable than active ones19,20; however, many interventions that are considered passive still inherently carry an active component, even if it is at the societal or political level, such as passing legislation to require certain safety features in automobiles. The number of times an active intervention needs to be performed to be effective is also a consideration in terms of efficacy. For example, a seatbelt must be used each time to be effective, while a vaccine usually only requires active participation for a limited time interval for it to have long-term effectiveness. If applied uncritically without a strong framework and thorough evaluation, behavior change through educational interventions in isolation can be difficult to achieve. A comprehensive report has suggested that the most effective interventions are engineering/environment, followed by enforcement, and lastly by education. An example is the child safety seat, an engineering solution for injury prevention, which was only successfully implemented Chapter 3 Injury Prevention 39 through successful education campaigns and careful law enforcement. Adaptability is the ability of a program to be modified so that it is applicable in a specific context. An effective injury control program needs to strike an appropriate balance between fidelity to established, evidence-based methodology, while being adaptable enough to maintain relevance to the specific population being served. Often, the fidelity and adaptability of a specific program will influence its prioritization among potential injury control interventions. Prioritization of targets in injury control for intervention depends on multiple factors. Certain injuries may occur frequently, but if the consequences of that injury in terms of severity are minimal, there may be a more important target for injury prevention or control. The cost of injuries in terms of direct health care costs and indirect societal and economic effects must also be considered. Effective arguments for implementing an injury control program can be made if savings in terms of averted injury-associated costs are demonstrated. Awareness of the importance of cost-effectiveness analyses and their potential as a tool for advocacy is steadily increasing. Finally, less easily quantifiable but equally important are the acceptability and feasibility (including political) of a program in the community. Obviously, the most effective strategy proposed should be prioritized; however, often, a mixed strategy is most effective and should be used, if resources allow. An "institutionalized" program is one that achieves ongoing support and commitment from the agency, organization, or community in which it is based. These include a multidisciplinary approach and community involvement and should involve ongoing evaluation of both the process and outcome of the program. Depending on the targeted injury type, a program might involve contributions from the following: health care professionals, public health practitioners, epidemiologists, psychologists, manufacturers, traffic safety and law enforcement officials, experts in biomechanics, educators, and individuals associated with the media, advertising, and public relations as previously noted.

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