髋周肌肉对髋臼骨折的影响

Influence of periacetabular muscle contraction on acetabular fractures

目的探讨髋周肌肉收缩合力对髋臼骨折的影响。方法选20具经防腐处理的成人完整骨盆(含40个髋关节),包括双侧近1/2股骨干。随机分成两组,每组20个髋关节。将标本适当修整后安装至RMT-150B岩石力学测试系统及特制的加力系统。对照组加力3500N,实验组加力4500N,以特制打击器打击制成髋臼骨折模型,记录两组打击力的大小。结果制成40个髋臼骨折模型。预加力与打击力(打击器加的暴力)Pearson相关指数为-0．923,P＜0．01。对照组打击力445～550N,实验组打击力290～400N,t=14．727,P＜0．01。结论髋周肌肉收缩力增加可降低髋臼应力、应变能力,显著影响暴力损伤结果,对髋臼骨折的发生也具有重要的,甚至决定性的作用。

Objective To study the influence of periacetabular muscle contraction on acetabular fractures. Methods Twenty intact adult cadaveric pelvis （40 hip joints） treated antiseptically with bilateral 1/2 femoral shafts were selected and divided randomly into two groups （20 hip joints in each group）. Then, the specimens were trimmed to fit the RMT-150B reck mechanics measuring system and the special increasing pressure system. After pressure of 3 500 N was pressed to the control group and pressure of 4 500 N to the experimental group, acetabular fracture model was made by beatening with special striking machine, when striking force was recorded. Results We made forty acetabular fracture models from 40 cadaveric hips. Pearson correlation coefficient of pressing force and striking force was -0. 923 （ P 〈 0.01 ）. The striking force of the control group and the experimental group was 445-550 N and 290-400 N, respectively （ t = 14.727,P 〈0.01 ）. Conclusion The increase of contraction force of the periacetabular muscles can decrease acetabular stress and strain, influence the result of violent injury and play a vital role in inducing acetabular fractures.