<prompt> Slipped capital femoral epiphysis is seen most commonly in which age group -InfantsAdolescentsOld ageChildhood  <response>: Slipped capital femoral epiphysis SCFE occurs during adolescent rapid growth period when epiphysis plate is weak the capital epiphysis is displaced down back. Etiology : age - 10-17years of age Sex- male : female - 5:2 Location: left hip is involved in 58 of the cases stages 1. Preslipping stage 2.chronic slipping stage 3.stage of fixed deformity Radiographic changes - early change : marginal blurring of the proximal metaphysis , lower margin of metaphysis is included within the acetabulum normally but excluded in the early epiphyseal slip, Trethovan ;s line : line drawn along the superior margin of the neck , transects the epiphysis normally , but will be above it in slip, depth of epiphysis is reduced , there is a step between metaphysis epiphysis. Late changes : trethovan;s sign is present , head is atrophic , neck shaft angle is less than 90 degree , new bone formation is seen at the anterior superior pa of neck , joint space is clear , shenton;s line is broken. CT scan is very useful in assessing degree of slips. Classification of slipping - mild51, moderate22, severe slipping 17 REF:Essential ohopedics, John Ebenezer, 4th edition, pg.no.416 