Embryology of the Hip

- Discussion: (see limb development);
            - at 4 to 6 gestational weeks, the hip joint develops from the cartilaginous anlage;
            - by 7 weeks a cleft develops between precartilagenous cells which are programmed to form the femoral head and acetabulum;
            - by 11 weeks, the hip joint formation is largely complete;
                    - femoral head is completely encircled by the acetabular cartilage;
            - at late gestation, femoral head grows more rapidly than the acetabular cartilage,
                    so that at birth the femoral head is less than 50% covered;
            - at birth, acetabulum is at its most shallow and most lax inorder to maximize hip ROM which facilitates the delivery process;
                    - hip is uncontained in extension and adduction reflecting hip shallowness;
            - after several weeks, acetabular cartilage develops faster than the femoral head, which allows progressively more coverage;
            - normal occurance of hip shallowness and capsular laxity in the neonatal period are inital factors factors involved in DDH



Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Wednesday, January 9, 2013 12:02 pm