点接触锁定加压接骨板固定骨质疏松粉碎性桡骨骨折的生物力学特性

Biomechanical research on new type point contact locking compression plate with osteoporotic comminuted radial fracture model

目的对比研究新型点接触锁定加压接骨板(point contact locking compression plate,PC-LCP)和动力加压接骨板(DCP)固定老年骨质疏松粉碎性桡骨骨折的生物力学特性。方法选取12对老年骨质疏松性尸体桡骨制成横断骨折,骨折间隙为1cm,模拟粉碎性骨折模型。每对随机选取,其中一根用PC-LCP固定,另一根用DCP固定。进行前后四点弯曲、内外四点弯曲及扭转实验,得到相应的弯曲刚度和扭转刚度。结果PC-LCP固定骨质疏松粉碎性桡骨骨折后的弯曲刚度及扭转刚度均高于DCP,但两者没有统计学差异(P>0.05)。结论新型接骨板PC-LCP固定骨质疏松粉碎性桡骨骨折的生物力学特性优于DCP。

Objective Biomechanical comparison between a new type of point contact locking compression plate and dynamical compression plate was made with an osteoporotic comminuted radial fracture model. Method Twelve pairs of aged osteoporotic cadaveric radial transverse fracture with lcm clearance were created to simulate comminuted fracture and each pair was fixed with PC-LCP,DCP, respectively. Then the anteroposterior four point bending,mediolateral four point bending and torsion tests was conducted to determine the bending and torsion compress stiffness of the PC-LCP and DCP. Result Both the bending and torsion stiffness of PC-LCP are higher than that of DCP, but there are no significant differences （P 〉0.05）. Condusions The new PC-LCP has a tendencyto osteoporotic comminuted radial fracture.