ccording to the characteristics of periosteum which have a copacity for regrowth of cartilage,free autogenous osteoperiosteal grafts taken from the medial side of the metaphsis of the tibia had beenused to reconstruct the osteochondral defects of the articular surface of the knee joint. The mothod wasillustrated by five cases which included of osteochondritis dissecans, subchondral osteonecrosis and oldfracture of the patella. By the period of 16-26 monthes follow up, using knee function...