Osteochondritis dissecans can be classified at surgery into 4 stages:
- lesion in continuity with the host bone
- covered by intact cartilage
- stable on probing
- partial discontinuity of the lesion from the host bone
- unstable on probing
- fragment not dislocated
- complete discontinuity of the "dead in situ" lesion
- dislocated fragment
Classification according to International Cartilage Repair Society.
Of course distinguishing stage II from III can be difficult on MRI.
- 1. Boutin Robert D., Jennifer A. Januario, Arthur H. Newberg et al. “MR Imaging Features of Osteochondritis Dissecans of the Femoral Sulcus.” Am. J. Roentgenol. 180, no. 3 (March 1, 2003): 641-645. [Link].