Abstract
1. In sixty mature rabbits osteochondral fractures of various types were made in the medial femoral condyle.
2. The fractures or fragments which remained stable united but those in which movement occurred progressed to non-union.
3. An ununited osteochondral fragment resembled osteochondritis dissecans in the human both radiologically and histologically.
4. Experiments in the cadaveric knee show that the patella articulates with the classical site on the intercondylar aspect of the medial femoral condyle in full flexion of the joint and here an osteochondral fracture could be sustained.
5. It is concluded that the fragment in osteochondritis dissecans follows an osteochondral fracture which remains ununited.
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