Osteochondritis dissecans is a condition in which part of the articular surface of a joint separates, due to a plane of cleavage through the subchondral bone. It is found most commonly in the knee although other joint can be affected, notably the elbow, ankle and hip. The etiology remains unclear, and treatment still provokes controversy in the orthopedic community. This review is confined to osteochondritis dissecans of the knee and reports the result of different methods of treatment including arthroscopic drilling. The authors experienced 7 cases of osteochondritis dissecans with received treatment at C.A.F.G.H. from May 1982 to November 1984. The results were obtained as follows: 1. Common symptoms and signs were pain, limitation of motion, quadriceps atrophy and weakness. 2. Five of six cases had histories of trauma. 3. The methods of treatment were as follows: Curettage and drilling................................................... 2 Excision ...................................................................... 2 Curettage and bone graft .............................................2 Arthroscopic drilling .................................................... 1