摘要
目的 为头状骨短缩术治疗月骨无菌性坏死提供生物力学依据。方法 对 10侧新鲜上肢标本 ,应用背侧粘贴电阻应变片的方法 ,通过电子万能实验机加载 ,在头状骨短缩前后 ,分别测量头状骨、舟骨、月骨和三角骨的应力变化。结果 完整的腕关节在承受轴向压缩负荷时 ,月骨及舟骨背侧的贴片点表现为拉伸应变 ,而头状骨及三角骨则表现为压缩应变。头状骨短缩术后 ,月骨表现为压缩应变 ,而头状骨的压缩应变则明显减小 ,舟骨拉伸应变明显增加 ,三角骨压缩应变无明显变化。结论 头状骨短缩术可通过桡腕关节使应力重新分布 ,使月骨承受由头状骨传递来的轴向负荷明显减小 ,有利于月骨的血运重建。
Objective To provide biomechanical basis for capitate shortening in treatment of Kienbock's disease. Methods The study was carried out on 10 fresh cadaveric upper limbs.Using dorsally mounted gauge, the stress changes of capitate, lunate, scaphoid and triangular bone under load were measured pre and post operatively by electric testing apparatus. Results When intact wrist was loaded,tensile strain was detected in lunate and scaphoid. On the contrary, capitate and triangular bone sustained compressive strain. After capitate was shortened, lunate bone compressive strain.The compressive stress of capitate and the tensile stress of scaphoid increased significantly, whereas stress on the triangular bone didn't change much. Conclusions Capitate shortening redistributes stress of the wrist and decreases the longitudinal compressive load on the lunate,which in turn facilitates revascularization of the lunate.
出处
《中华手外科杂志》
CSCD
1999年第3期146-148,共3页
Chinese Journal of Hand Surgery
基金
吉林省科研基金!资助项目 (编号 970 569)
关键词
月骨
骨坏死
腕骨
应力物理
治疗
Semilunar bone Osteonecrosis Carpal bones Stress, Mechanical
