1 临床资料 患者,男性,年龄为38岁,轰-5飞行教员,飞行时间1280h。本次健康疗养入院时,主诉偶有左膝关节隐痛3年余。查体:左膝关节无畸形,局部无红肿及压痛,侧压试验、抽屉试验、麦氏试验及研磨试验均阴性,关节活动未见异常。X线片示:左股骨下端骨骺外侧有局限的囊性改变,呈溶骨性破坏,局部骨皮质变薄,轻度膨胀,未穿破骨皮质,未破入膝关节,肿瘤范围较清楚,局限,无骨膜反应及病理性骨折。胸片检查未发 1 Clinical data Patients, men, aged 38, H-5 flight instructors, flight time 1280h. The health care admission, the main complaint occasional left knee joint pain more than 3 years. Physical examination: left knee without deformity, no local swelling and tenderness, lateral pressure test, drawer test, Maxwell test and grinding test were negative, no abnormal joint activity. X-ray showed: the left femoral epiphyseal lateral limited slender cystic changes were osteolytic destruction of local cortical thinning, mild swelling, did not wear broken cortical, did not break into the knee, the tumor range more clearly, Limitations, no periosteal reaction and pathological fractures. Chest radiography failed