Developmental Dysplasia of the Hip (DDH) includes a group of related disorders: hip instability, subluxation, dislocation, and acetabular dysplasia. Many patients perform normally in childhood and gradually develop subluxation as they grow older. At this time, if left untreated, some patients are prone to develop complete subluxation, often secondary to osteoarthritis of the hip (OAH) in middle and young adulthood, manifesting as pain and claudication after exertion and distance travel, and patients often begin to experience pain at the age of 30 Around the age of 30, young, painful symptoms can still be tolerated. How to treat this is more problematic, many patients are misdiagnosed as femoral head necrosis for treatment. The disease progresses quickly and painfully, and serious patients lose their ability to work, so conservative treatment is often ineffective at this time. The diseased joint in patients with hip dysplasia can manifest itself in many forms of anatomical abnormalities. From mild subluxation to total dislocation with upward migration of the femoral head, surgery is difficult. If the problem is detected in time at a young age and various osteotomies of the pelvis and proximal femur are used early, the onset of late osteoarthritis can be avoided or delayed in some patients.