Osteochondral lesions or osteochondritis dissecans is an idiopathic disease which affects the subchondral bone and its overlying articular cartilage due to loss of blood flow; this leads to loose bodies within the joint.
It occurs can occur when there already is an injury to the joint, for example a badly twisted knee, and results in separation and instability of a segment of cartilage and free movement of osteochondral segments within the joint space; in several reasons the development is idiopathic (Edmonds and Polousky, 2013).
two main places in the knee where it occurs:
- Femoral condyles, especially the medial condyle on the lateral joint surface (80%)
- Patella: in 10% on the kneecap
For a stable OCD, first treatment should be non-operative management; giving 3-6 months for improvement; only then and when loose parts are in the joint, surgery should be the option (Edmonds and Polousky, 2013)
Edmonds E.W. and Polousky J., 2013, A review of knowledge in osteochondritis dissecans: 123 year of minimal evolution from Koenig to the ROCK Study Group, Clinical Orthopaedics and Related Research, 471(4), pp: 1118-1126