The clinical symptoms and signs of soft tissue lesions in the hip joint lack specificity and are difficult to assess by traditional methods. In the past, the diagnosis of hip pain in young people was mostly generalized as “early arthritis”, but the damage and lesions of soft tissues in the hip joint could not be recognized. With the development of MRI and other diagnostic techniques, the advancement of operation techniques, and the development of new techniques and equipment, the clinical application of hip arthroscopy has been greatly improved. 1, indications and contraindications The main indications for hip arthroscopy include: glenoid labral tear, hip impingement, cartilage injury, round ligament injury, free body, and elastic hip. Other relative indications include management of femoral head necrosis, synovial chondromatosis and other synovial abnormalities, crystalline hip arthropathy (gout and pseudogout), intra-articular infection, cleaning of intra-articular debris after trauma, and management of mild to moderate hip osteoarthritis with mechanical symptoms. In addition, hip arthroscopy is beneficial in patients with prolonged unrelieved hip pain and positive physical examinations. Contraindications to hip arthroscopy include: hip fusion, progressive arthritis, open wounds, cellulitis, obesity, femoral neck stress fractures, severe hip dysplasia and stable ischemic necrosis. 2, glenoid labrum injury Glenoid labrum injury is the most common cause of hip pain that can be identified by arthroscopy, and is associated with limitation of motion and daily life in addition to triggering hip pain. A labral tear is similar to a meniscal injury of the knee, in that the patient often exhibits mechanical symptoms (interlocking and painful popping), which can be accompanied by limited mobility. Sometimes the presentation is more insidious, with vague symptoms that worsen with activity and pain that does not resolve with rest in specific positions. Hip arthroscopy should be considered for those with hip pain symptoms lasting greater than 4 weeks and clinical signs and imaging consistent with glenoid labral tears. Although a history of specific trauma, such as sprains, bruises or other lower extremity loading injuries, can precede the onset of symptoms, glenoid labral tears caused by a single trauma are relatively rare and are mainly seen in athletes with strenuous antagonistic sports or high-energy injuries to the hip joint. Laxity of the joint capsule and hypermobility of the hip joint are common in dancers, gymnasts, etc. and in those with generalized ligamentous laxity. Patients with acetabular dysplasia often have a large glenoid labrum to compensate for the lack of bony coverage, so those with acetabular dysplasia are prone to glenoid labral tears. The last factor that predisposes to glenoid labral tears is degeneration of the entire hip joint. 3, hip impingement Ganz et al. described two types of femoral acetabular impingement, “impingement” due to excessive coverage of the anterior acetabular rim or retroversion of the acetabulum, and “cam-type impingement” due to non-spherical femoral head, flexion of the hip position and the anterior acetabular rim impingement. Non-spherical femoral head impingement is due to an abnormal proximal femoral head and neck offset, usually described as a “pistol shank deformity” of the femoral neck, mostly due to a mild or subclinical slipped upper femoral epiphysis. Femoral acetabular impingement in the extreme position of hip movement causes repetitive acetabular glenoid lip microtrauma, resulting in damage to the glenoid lip and cartilage, thus initiating the development of osteoarthritis of the hip joint. 4, popping hip The popping hip is characterized by an audible or perceptible popping sound during hip joint activities, mostly seen during physical activities and often accompanied by pain. Three types of snapping hips have been recognized: lateral snapping, medial snapping and intra-articular snapping, of which lateral snapping is the most common. The lateral snapping is caused by the posterior edge of the iliotibial bundle or the anterior edge of the gluteus maximus rubbing against the greater trochanter during hip extension activities. Medial popping is often caused by painful friction of the iliopsoas tendon on the iliopubic crest or femoral head. In contrast, intra-articular popping is mostly due to intra-articular free bodies, such as fracture fragments, torn glenoid labral fragments, cartilage flaps or synovial chondromatosis.