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首页> 外文期刊>Journal of shoulder and elbow surgery >Influence of radial head prosthetic design on radiocapitellar joint contact mechanics
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Influence of radial head prosthetic design on radiocapitellar joint contact mechanics

机译：head骨头假体设计对放射性小it关节接触力学的影响

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Hypothesis: Our aim was to test whether anatomically designed metallic radial head implants could better reproduce native radiocapitellar contact pressure and areas than nonanatomic implants. Methods: The distal humerus and proximal radius from 6 cadaveric upper extremities were serially tested in supination with 100 N of compression force at 4 angles of flexion (0°, 30°, 60°, and 90°). By use of a thin flexible pressure transducer, contact pressures and areas were measured for the native radial head, an anatomic implant, a nonanatomic circular monopolar implant, and a bipolar nonanatomic implant. The data (mean contact pressure and mean contact area) were modeled using a 2-factor repeated-measures analysis of variance with P ≤ .05 considered to be significant. Results: The mean contact areas for the prosthetic radial heads were significantly less than those seen with the intact radial heads at every angle tested (P < .01). The mean contact pressures increased significantly with all prosthetic radial head types as compared with the native head. The mean contact pressures increased by 29% with the anatomic prosthesis, 230% with the monopolar prosthesis, and 220% with the bipolar prosthesis. Peak pressures of more than 5 MPa were more commonly observed with both the monopolar and bipolar prostheses than with the anatomic or native radial heads. Conclusions: The geometry of radial head implants strongly influences their contact characteristics. In a direct radius-to-capitellum axial loading experiment, an anatomically designed radial head prosthesis had lower and more evenly distributed contact pressures than the nonanatomic implants that were tested.
机译：假设：我们的目的是测试解剖设计的金属radial骨头植入物是否比非解剖植入物能更好地重现天然放射性小囊的接触压力和面积。方法：连续测试了6个尸体上肢的肱骨远端和近端radius骨，在4个屈曲角度（0°，30°，60°和90°）上以100 N的压缩力进行旋后测试。通过使用薄的柔性压力传感器，测量了自然radial骨头，解剖植入物，非解剖圆形单极植入物和双极非解剖植入物的接触压力和面积。数据（平均接触压力和平均接触面积）使用2因子重复测量方差分析建模，P≤0.05被认为是有效的。结果：在每个测试角度，假体radial骨头的平均接触面积均显着小于完整with骨头的平均接触面积（P <.01）。与天然头相比，所有假体radial骨头类型的平均接触压力均显着增加。解剖假体的平均接触压力增加29％，单极假体的平均接触压力增加230％，双极假体的平均接触压力增加220％。单极和双极假体比解剖或天然radial骨头更常见峰值压力超过5 MPa。结论：radial骨头植入物的几何形状强烈影响其接触特性。在直接进行的径向至体外的轴向载荷实验中，解剖学设计的radial骨头假体比被测试的非解剖学植入物具有更低，更均匀分布的接触压力。

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