Developmental dislocation of hip joint is a kind of disease which leads to unilateral or bilateral hip instability and poor alignment between femoral head and acetabulum due to heredity, breech delivery and leg binding. Symptoms of congenital dislocation of hip in infants The complications after treatment of congenital dislocation of hip are mostly caused by rough operation, insufficient traction, unclear surgical indications, unclear factors hindering reduction and improper fixation. Congenital dislocation of hip joint itself will not cause necrosis of femoral head. However, both manual reduction and open reduction are prone to femoral head necrosis. The reason for this complication is that the femoral head blood vessels are damaged to varying degrees during reduction. Recommended reading: Revealing the Three Behind-the-scenes Hands of Femoral Head Necrosis (Video) Another reason for femoral head necrosis is the need for external fixation after reduction. When the hip joint is fixed in the over-flexed external position or over-rotated internal position, the medial femoral circumflex artery will be squeezed, which will affect the blood supply of the femoral head and neck. Keeping this posture for a long time will also increase the internal pressure of the joint, causing venous reflux disorder, internal venous stagnation, internal bone pressure increase, blood transfusion reduction, and even ischemic necrosis due to blood flow interruption.