Ortho Oracle - orthopaedic operative atlas

Sliding Hip Screws: Low Plate Angle

– Discussion:     – device that is placed at lower angle has less force working parallel to sliding axis & more force working perpendicular to sliding axis.             – this perpendicular force acts to jam or bend the device, thereby preventing impaction.     – device that is placed at lower … Read more

Sinus Tarsi

– Discussion:     – sinus tarsi is the depression found on the lateral side of the tarsus and is distal to and on the same level as the lateral malleolus;     – on incision of the structures overlying the sinus tarsi – namely, lateral portion of the inferior extensor retinaculum, interosseous talocalcaneal             ligament and reflection … Read more

Sizing and Seating of the Tibial Tray

– Sizing of the Tibial Component:     – generally, the tibial component is either larger or at least the same size as the femoral component;            – femoral overhang is a significant source of postoperative TKR pain;            – ref:  Overhang of the Femoral Component in Total Knee Arthroplasty: Risk Factors and Clinical Consequences     – … Read more

Skew Foot

– Discussion:     – a type of flat foot described as a z foot or serpentine foot;     – pathoanatomy:            – forefoot:                   – first metatarsal lies adducted and plantar flexed on the medial cuneiform, w/ resultant marked adductus deformity … Read more

Skin Grafts: for Hand Defects

– Full Thickness Skin Grafts:     – skin can be taken from the hypothenar area or from the instep of the foot, but forthese grafts to provide truly critical sensibility,             they must be full thickness grafts;            – full thickness grafts will transfer Meissner’s corpuscles (required for     … Read more

Skin Preparation Agents

– See: Methods to Prevent Infection – Skin Preparation Agents:    – alcohol:         – rapid significant reduction in skin microbial counts is major effect desired;    – techni-care:    – iodophors:     – ioban draping: (3M™ Ioban™)          – Risk for infection after anterior cervical fusion: prevention with iodophor-impregnated incision drapes.          … Read more

Singh Index for Osteoporosis

– See: Osteoporosis and Hip Fractures – Bony Trabeculae of the Proximal Femur:      – Ward’s Triangle      – Greater Trochanteric Group      – Secondary Compressive Group      – Secondary Tensile Group      – Principal Tensile Group      – Principal Compressive Group              Changes in trabecular pattern of the upper end of … Read more

Single Limb Stance

– See: Stance Phase: – Discussion:     – single limb stance comprimises 38% of gait cycle;     – during single limb stance, the ankle begins to dorsiflex by motion of tibia over the fixed foot;     – early phase:            – subtalar joint is pronated inorder to absorbe … Read more