背景　骨旁骨肉瘤是一种低度恶性骨肿瘤 ,起源于长骨干骺端的表面 ,骨旁骨肉瘤分化较好 ,转移较慢 ,广泛切除骨旁骨肉瘤提供了一种相对无风险预防局部复发的方法。我们采用一种新方法即在股骨远端月国窝骨旁间隙来局部切除骨旁骨肉瘤 ,这种方法通过内外侧双切口切除肿瘤便于软? Background Parosteal osteosarcoma is a kind of low-grade bone tumor, which originated from the surface of the metaphysis of long bone. Osteosarcoma of bone is well differentiated and metastasized slowly. Extensive resection of paraskeletal osteosarcoma provides a relatively risk-free prevention of local recurrence. Methods. We have adopted a new method to locally resect parasellar osteosarcoma in the peri-furrow space of the femur in the distal femur. This method makes it easier to soften the tumor through a double lateral incision.