Trethowan sign is used in radiological diagnosis of?: (A) TB Hip, (B) Pehes Disease, (C) Slipped Capital Femoral Epiphysis, (D) Avascular Necrosis of head of femur
Answer is C. TRETHOWAN'S SIGN In normal hip a line drawn tangential to superior femoral neck (Klein's line) intersects small poion of lateral capital epiphyseal. In posterior displacement of epiphyses the line doesn't intersect.