안정성과 불안정성 박리성 골연골염의 감별에서 자기공명 양상소견 : 자기공명영상 기준의 재평가 = MR Findings for Differentiating Stable & Unstable Osteochondritis Dissecans-Reappraise the MRI Criteria

다국어 초록 (Multilingual Abstract)

Objective: To assess the radiographic and MR features of osteochondritis dissecans(OCD) in the knee, ankle and elbow and reappraise the criteria for differentiating stable and unstable OCD by using MRI.
Materials and Method: The author retrospectively reviewed 16 cases of OCD who had correlative arthroscopy or arthrotomy. There were 15 patients with an average age of 18 years(12-41 years). The author analysed age, location, shape, signal intensity, articular cartilage, subchondral bone, abnormal fluid collection and displacement of OCD if any.
Results: 12 cases in femoral condyle(7 in MFC and 5 in LFC), 2 cases in medial talar dome and 2 cases in capitulum. Stable OCD were present in 4(25%) and ubstable OCD in 12(75%)of 16 cases. Radiography showed poor correlation with arthrography and 7 cases were understaged. MRI proved accurate in discriminating stable(4 of 4 cases) versus unstab1e(12 of 12 cases) OCD.
Conclusion: The author conclude that high signal intensity line between OCD and underlying bone, defect of articular cartilage and subchondral bone cyst, displacement of fragment(if any) on T2WI of MRI are strongly suggestive findings of unstable OCD. MRI is very sensitive method of detecting instability of OCD and can predict arthroscopic findings accurately.