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首页> 外文期刊>Journal of Biomechanics >Influence of glenohumeral mismatch on bone strains and implant displacements in implanted glenoids. An in vitro experimental study on cadaveric scapulae.
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Influence of glenohumeral mismatch on bone strains and implant displacements in implanted glenoids. An in vitro experimental study on cadaveric scapulae.

机译：盂肱错配对植入的关节盂中的骨应变和植入物移位的影响。尸体肩cap骨的体外实验研究。

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In shoulder arthroplasty, there is no consensus about the ideal mismatch between a prosthetic humeral head and a glenoid component. Thus, investigations into mismatch effects from a biomechanical point of view can be useful. The aim of this in vitro study was to help us understand mismatch influence on bone strains, translational forces in the joint and implant/bone displacements in implanted scapulae. Five fresh cadaveric scapulae were implanted with a cemented keeled polyethylene implant. The lower part of the scapulae was embedded and the loadings were carried out using five metallic spheres simulating mismatches of 0, 2, 4, 5 and 6 mm. Loadings included a constant compressive preload of 392N and an anterior, posterior, inferior and superior translation of 2.5 mm. We measured the transversal force necessary to produce the imposed translation, the strains at six locations around the peripheral cortex of the glenoid using strain gages and the relative implant/bone displacements using CCD cameras. Generally, the increase of mismatch reduced the translational forces, the strains around the glenoid and, except for the anterior loading, the relative implant/bone displacements. Few and even no significant differences were observed when the mismatch varied from 0 to 2 mm; the number of significant differences increased when the mismatch varied from 0 to 4mm and from 0 to 5 mm; the results obtained for a 0-6 mm variation in mismatch were comparable to those obtained for a 0-5 mm variation. This study underlines that the mismatch has a significant effect on bone strains, relative implant/bone displacements and induced translational forces when a compressive preload and imposed translations were applied on implanted scapulae.
机译：在肩关节置换术中，关于假体肱骨头与盂盂成分之间的理想失配尚无共识。因此，从生物力学的角度研究失配效应可能是有用的。这项体外研究的目的是帮助我们了解错配对骨应变，关节中的平移力以及植入的肩骨中的植入物/骨移位的影响。用胶合龙骨聚乙烯植入物植入五个新鲜的尸体肩骨。嵌入肩s骨的下部，并使用五个金属球模拟0、2、4、5和6 mm的不匹配进行加载。载荷包括恒定的392N压缩预载荷和2.5mm的前，后，下，上平移。我们测量了产生强制平移所必需的横向力，使用应变计测量了关节盂周围皮质周围六个位置的应变，并使用CCD相机测量了相对植入物/骨骼的位移。通常，失配的增加会降低平移力，关节盂周围的应变以及除前部载荷外的相对植入物/骨位移。当不匹配从0到2 mm变化时，几乎没有观察到显着差异。当不匹配度从0到4mm和从0到5 mm变化时，显着差异的数量增加;失配0-6 mm变化获得的结果与0-5 mm变化获得的结果相当。这项研究强调，当在植入的肩骨上施加压缩预紧力和强行平移时，失配对骨应变，相对的植入物/骨位移和诱发的平移力有重大影响。

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