Ortho Oracle - orthopaedic operative atlas

Bacteriology of Orthopaedic Infections in Neonates

– See:       – Osteomyelitis in New Born       – Septic Hip – Bacteriology:     – in hospital-acquired cases, staphylococci are the predominant isolates (about 60%), followed by Group B streptococcus, candida & gram-negative bacilli;           – these infections often stem from invasive procedures such as … Read more

Baker’s Cyst / Popliteal Cysts

– Discussion:     – a type of cyst which results from egress of fluid through a normal communication of a bursa (semimembranosus or medial             gastrocnemius bursa) or may be caused by herniation of the synovial membrane through the joint capsule;     – symptoms develope most often in bursa beneath the medial head of gastrocnemius … Read more

Azathioprine

– Discussion:  – prevents conversion of purine bases by suppressing synthesis of guanine and adenosine; – RA Doses: 1-2.5 mg/kg/day;  – onset of action is usually 12 to 24 weeks;  – discontinuation of the drug is marked by a return in disease activity;  – Toxicity:  – most common toxicity is gastrointestinal including nausea, anorexia, and, … Read more

Axillary Approach to the Shoulder

– Indications:     – most often used for anterior shoulder reconstructions – Positioning:     – beach chair w/ full access to posterior aspect of shoulder;     – holding shoulder in flexion, will relax shoulder & facilitate exposure;     – consider the Mconnel Shoulder Positioner;     – references:       … Read more

AVN: Pathogenesis

– Discussion: (See: Blood Supply to Femoral Head)     – there are certain areas of bone in which vascular supply is precarious;     – these areas are subject to infarction and avascular necrosis;     – three such regions are head of femur, body of talus, & scaphoid;     – they have the … Read more

Atlantooccipital disassociation

– See:      – Occipital-Atlanto-Axial Anomalies:      – Anatomy of C1 / C2 – Discussion:     – more common children, since the pediatric occipital condyles are small and almost horizontal & lack inherent stability;     – this injury is usually but not invariably fatal 2nd to respiratory arrest caused by injury … Read more

Cultures and Gm Staining of Synovial Fluid

– Discussion:     – Cx & Gram’s staining are obligatory when infection is suspected.     – Definitive diagnostic test is either the demonstration of bacteria by Gram’s stain, usually best seen on a concentrated sediment of centrifuged synovial fluid, or the               recovery of bacteria from the synovial-fluid culture;     – Gram’s stains are positive … Read more

Crystal Examination of Synovial Fluid

– Discussion:       – careful exam to identify crystals in synovial fluid can establish a dx early and avoid unnecessary hospital admissions for treatment of suspected infectious arthritis.       – presence of crystals does not exclude infection, esp since abnormalities such as Gout may increase likelihood of septic arthritis;               – cultures … Read more