目的分析膝关节剥脱性骨软骨炎(ocd)的X线平片与MRI表现，比较各序列对病变的检出价值。

Objective to investigate the X-ray and MRI manifestations of osteochondritis dissecans (OCD) and to compare the sensitivity of detection among different sequences.

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问题： 在患有膝关节剥脱性骨软骨炎（OCD）的患者中，自体骨软骨移植（OAT）是否比微骨折术更有效？

Question: In children with osteochondritis dissecans (OCD) injuries of the knee, is osteochondral autologous transplantation (OAT) more effective than microfracture?

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