软骨母细胞瘤发生于膑骨及跟骨者罕见,本文报告2例。例1,男,21岁。右膝酸痛1年8个月,起病时先觉右膝隐痛,劳累后加重,无外伤史,无体温增高或局部红肿,关节活动自如。近8个月,发现该膝前 Chondroblastomas occur rarely in the sacrum and calcaneus. Two cases have been reported in this paper. Example 1, male, 21 years old. Right knee pain for 1 year and 8 months. When the onset of the disease, the patient feels pain in the right knee, aggravates after exertion, no history of trauma, no increased body temperature or localized swelling, and joint movement. Nearly 8 months ago, the knee was found