髌骨爪具有“动力性张力带作用”可以复位及固定髌骨骨折，髌囊环扎可保证粉碎性骨折的稳定性。
Patella has a "dynamic tension band effect" can be reset and fixed patellar fracture, patellar fracture capsule cerclage can guarantee stability.
结论：治疗老年背伸型粉碎性桡骨远端骨折，宜采用外固定器固定，可减少复位丢失，有利于功能恢复。
Conclusion: the external fixator can be adopted to treat comminuted distal radius fractures in senile, which is able to decrease the reduction loss and helpful to functional recovery.
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