患者,男性,28岁,已婚,因右膝下酸痛不适4个月余,近2月来加重,于1984年10月10日住院。检查:右膝关节下软组织肿胀,表面不红,浅静脉不怒张,关节下胫骨结节处有压痛,局部呈弹性感,关节活动正常。x 线片表现胫骨上干骺端处以髓腔为中心 The patient, male, 28 years old, was married. He suffered discomfort under his right knee for more than 4 months and he was severed in the past 2 months. He was hospitalized on October 10, 1984. Examination: Swelling of the soft tissue under the right knee joint, the surface is not reddened, the superficial veins are not engorged, there is tenderness at the lower tibial tubercle of the joint, local elasticity, and normal joint activity. The x-ray film shows the medullary cavity centered on the metaphysis of the sacrum.