患者男,13岁,右膝关节疼痛并活动障碍4月。查体:右膝关节屈伸受限(屈曲120°,伸直170°),右股骨下段内侧略肿胀,未触及包块,无压痛,叩击痛(+)。外院曾按“右膝关节炎”治疗效果不明显。X线片:右股骨下端骨骺可见一大小约1.3 cm×1.5 cm类圆形骨质破坏区,密度不均匀,周围可见环 Patient Male, 13 years old, with right knee pain and mobility disorder in April. Physical examination: right knee flexion and extension limited (buckling 120 °, 170 ° straight), the right femoral medial slightly swelling, no mass, no tenderness, percussion pain (+). Outside the hospital had according to “right knee arthritis” treatment effect is not obvious. X-ray film: the right femur epiphyseal shows a size of about 1.3 cm × 1.5 cm class circular bone destruction area, uneven density, around the ring can be seen