Diagnosis and management of hip injuries has advanced significantly in the past few years with the improvement of arthroscopic techniques of the hip. Many of pathologic conditions previously unrecognized and untreated have been diagnosed and treated correctly under hip arthroscopy . Current application for hip arthroscopy include management of labral tears,osteoplasty for femoroacetabular impingement, thermal capsulorrhaphy and capsular plication for subtle rotational instability and capsular laxity, lateral impact injury and chondral lesions, osteochondritis dissecans, ligamentum teres injuries, internal and external snapping hip, removal of loose bodies, synovial biopsy, subtotal synovectomy, synovial chondromatosis, infection, and certain cases of mild to moderate osteoarthritis with associated mechanical symptoms. In addition,patients with long-standing, unresolved hip joint pain may benefit from arthroscopy. Patients with reproducible symptoms and physical findings that reveal limited functioning, and who have failed an adequate trial of conservative treatment will have the greatest likelihood of success after arthroscopic intervention. Prescise attention to thorough physical examination, detailed imaging,and adherence to safe and reproducible surgical techniques are essential for the success of this procedure.

To investigate the feasibility of using poly-beta-hydroxybutyrate as scaffolds for bone tissue engineering. Marrow stromal cells were harvested from New Zealand rabbit′s iliac bone. After being cultured and multiplied in vitro,with the use of dexamethasone to promote the osteoblastic phenotype of the cells, the cells were seeded into poly-beta-hydroxybutyrate. The cells/ poly-beta-hydroxybutyrate construction was implanted subcutaneously in nude mice. In control animals, poly-beta-hydroxybutyrate alone was implanted. Osteogenesis was assessed by histological and roentgenographic analysis. Four weeks after implantation, osteoid tissue had been observed in the specimens of the composite; 8 weeks after implantation, large amount of new bone had been found, and lamellar bone had been observed also. In the control, only fibrous tissue had been found. It suggested that poly-beta-hydroxybutyrate can be used as a scaffold material for bone tissue engineering.