<prompt> Trethowan sign is used in radiological diagnosis of?TB HipPehes DiseaseSlipped Capital Femoral EpiphysisAvascular Necrosis of head of femur  <response>: TRETHOWANS SIGN In normal hip a line drawn tangential to superior femoral neck Kleins line intersects small poion of lateral capital epiphyseal. In posterior displacement of epiphyses the line doesnt intersect. 