Please explain there is an ostechondral lesin involving the medial facet of the patella adjacent to the patellar ridge with bone marrow edema.

Osteochondral lesion: Is a focal injury of the cartilage and underlying bone along the articular surface, due to trauma, repetitive micro trauma, instability, or abnormal joint loading. If left untreated, can lead to accelerated development of osteoarthritis. Treatment depends on patient factors and lesion characteristics. Best to see an orthopedic surgeon.