I just returned home from surgery, had a quick dinner and answered some questions from my patients. Now to talk about hip dysplasia. Childhood hip dysplasia, with a male:female ratio of 6:1, is called congenital dislocation of the hip (CDH) in the orthopedic profession, and for this condition, the main emphasis is on early detection and early intervention. It is relatively simple to treat if it is detected during the infant’s physical examination after birth. In the early stages, a pantyhose or a frog position cast can be worn. At older ages, periacetabular osteotomy and rotational osteotomy of the upper femur are required. (For treatment in this period, please see our clinic with Dr. Chen Bochang and Dr. Bao Kun. Developmental dysplasia of the hip (DDH) in adults, if the onset is unilateral, due to the unequal length of the lower limbs and the tilted pelvis, is detected earlier and the patient is seen earlier; if the onset is bilateral, the claudication is usually later. Hip dysplasia mostly occurs due to weight gain (e.g., after pregnancy and childbirth) and hip pain symptoms. Patients seek medical treatment because of the need to work or to talk to friends. Hip dysplasia is classified into 4 degrees according to the degree of dislocation. The difficulty of treatment varies.