Diagnosis and surgical treatment of various joint diseases: 1. shoulder periarthritis, rotator cuff injury, shoulder instability and shoulder dislocation, biceps tendon rupture, etc.; 2. orthopedic elbow inversion deformity due to trauma and various causes, nerve entrapment syndrome, humeral epicondylitis (tennis elbow), elbow dislocation, etc.; 3. periarticular ossifying myositis; 4. septic infection of bone and joint, atopic infection, etc. Diagnosis and treatment of bone and soft tissue tumors, limb preservation treatment of malignant bone tumors, surgical treatment of benign and malignant bone tumors; 3. Surgical treatment of ischemic necrosis of the femoral head, including local decompression by drilling, bone graft with vascular tip, artificial femoral head replacement, artificial total hip replacement, etc.; 4. Surgical treatment of femoral neck fracture and intertrochanteric fracture; 5. Surgical treatment of intra-articular fracture and ligament injury. periarticular fractures, floating knees, tibial plateau fractures and other injuries; vi. surgical treatment of osteoarthritis, including joint cleanup and artificial joint replacement; vii. surgical treatment of hip and knee lesions of rheumatoid arthritis and ankylosing spondylitis, including orthopedic treatment of severe ankylosing deformities of the joints; viii. artificial joint replacement of the hip, knee, shoulder, elbow and other joints and revision of the joints after joint replacement surgery for various reasons Diagnosis and treatment of congenital hip dislocation, various pediatric extremity osteoarthrosis; X. Various congenital and traumatic deformities of bone and joint, including eccentric rotational osteotomy for pediatric and adult hip dysplasia, total hip replacement, etc.; XI. Surgical treatment of lower limb fractures, pelvic fractures, acetabular fractures, treatment of delayed fracture healing and non-healing; XII. Minimally invasive diagnosis and treatment of arthroscopic joint sports injuries; xiii. various bone diseases of the extremities, including acute and chronic osteomyelitis, bone and joint tuberculosis, bone and joint deformities; xiv. various difficult cases of bone and joint of the extremities; xv. diagnosis and treatment of osteoporosis and various bone diseases and injuries caused by osteoporosis, and various bone and joint diseases combined with osteoporosis.