Figure 1
![Figure 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Far2971/MediaObjects/13075_2010_Article_2806_Fig1_HTML.jpg)
(a) Grade 2 medial femoral bone marrow lesions. (b) Lateral femoral subchondral bone cyst at baseline. (c) Regression of lateral femoral subchondral bone cyst at follow-up.
(a) Grade 2 medial femoral bone marrow lesions. (b) Lateral femoral subchondral bone cyst at baseline. (c) Regression of lateral femoral subchondral bone cyst at follow-up.