Data Trace Editor, Author at Wheeless' Textbook of Orthopaedics : Page 77 of 424

Steel

– Discussion: – involves Salter osteotomy + osteotomy of both rami which results in placing articular cartilage over femoral head; – indicaitons: – older children w/ residual dysplasia & subluxation in whom there is minimal potential for remodeling; – older children w/ DDH since … Read more

Statistics for Orthopaedists

– Accuracy of a Test: – percentage of patients in which the test gives a correct answer; – the following equation is used to calculate accuracy: (true positives + true negatives) / (true positives + true negatives + false positives and false negatives); – Sensitivity: – refers to the ability … Read more

State of Calcium in Body Fluids

– See: – Physical Properties of Calcium – Discussion: – the concentration of ionic calcium in blood must be kept below solubilityproduct of Ca phosphate salt, & it is also important that additional calcium is reversibly complexed with plasma proteins; – total calcium concentration in plasma is … Read more

Staph aureus: Nasal Carriage

– See: – S. epidermidis – S. aureus – Discussion: – about 20 % of people almost always carry a strain of staph aureus, and approximately 60 % harbor S. aureus on an intermittent basis; – in the study by von Eiff C, et al, … Read more

Staph epidermidis

– Discussion: – is a coagulase negative, gram positive organism; – has emerged as one of the most common organisms in total joint infections (and in other implanted devices); – it is often minimally toxic (as compared to other bacterial infections), and many patients will have minimal symptoms of infection; … Read more

Stance Phase of Gait

– See: – Gait Menu: – Orthotics for the Foot – Discussion: – stance phase represents about 60% of the gait cycle, swing 40%; – normal gait is symmetric & thus, relationship between swing and stance phases of each leg are consistent; … Read more

Staph aureus

– Discussion: – is a coagulase positive, gram positive organism (as opposed to coag neg s. epidermidis) – has a strong propensity to invade traumatized tissue; – often responsible for toxic shock syndrome and necrotizing fascitis; – serious infection that spreads rapidly along fascial planes and … Read more

Staging of Impingement Syndromes

– Stage I: – edema and hemorrhage: – reversible lesion usually seen in the second and third decade; – exam: – palpable tenderness over the greater tuberosity at supraspinitus insertion – palpalble tenderness along the anterior edge of the acromion; … Read more

Stages of Rheumatoid Arthritis

– Stage I: – represents synovitis: – synovial membrane becomes hyperemic and edematous with foci of infiltrating small lymphocytes; – joint effussions w/ high cell count (5,000 to 60,000 per mm3) – x-rays will as yet show no destructive changes, but soft tissue swelling or osteoporosis may be … Read more

Staged Revision for Infected Total Knee Joint

– see 2 stage hip spacer – Discussion: – staged revision w/ antibiotic spacer: (see antibiotics in cement and local antibiotic delivery for septic joints) – debridement of components is followed by 6 weeks of IV antibiotics; – it is essential that all foreign material including cement be … Read more