Osteochondritis Dissecans of the Medial Femoral Condyle With Intra-Articular Meniscal Calcification: A Rare Case and Literature Review.

Osteochondritis dissecans (OCD) is a joint disorder characterized by subchondral bone necrosis and potential fragment detachment; although intra-articular loose bodies are common, a meniscal-fixed calcified body associated with OCD is exceedingly rare. This case reports a 56-year-old male with a Stage 4B OCD lesion on the medial femoral condyle and a concomitant calcified body fixed to the posterior horn of the medial meniscus, which was identified via MRI as a primary driver of chronic mechanical stress and lesion progression. Following arthroscopic excision and microfracture, the patient demonstrated significant clinical recovery at 6 months, with VAS scores decreasing from 7 to 3 and KOOS improving from 15 to 75. This rare association suggests that localized mechanical impingement from meniscal-fixed calcifications may play a critical role in OCD pathogenesis, emphasizing the necessity of comprehensive imaging to identify such contributing factors for optimized surgical outcomes.