An in vitro study of glenoid implant peripheral peg interface mechanics during eccentric loading and lift-off

IF 2.1 3区 医学 Q2 ORTHOPEDICS
Jakub Targosinski, Jonathan Kusins, George Athwal, Andrew Nelson, Louis Ferreira
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Abstract

Glenoid implants used in anatomic total shoulder arthroplasties typically incorporate peripheral pegs as a design feature to support eccentric loads. These peripheral pegs and the implant-cement-bone interface undergo substantial cyclic tensile-compressive loads during normal activity. Therefore, these pegs are of interest in translating the micromechanics of local implant fixation failure to the biomechanics of gross anatomic failure of the glenoid implant after total shoulder arthroplasty. This study used an in vitro peg-cement-bone construct which incorporated bone tissue acquired from osteoarthritic patients undergoing total shoulder arthroplasty. Strain distributions in the peripheral peg-cement-bone interfaces were analyzed under loading conditions emulating glenoid implant edge displacements. It was found that tensile strains in the interfaces were highest near the backside-peg junction and were greater in magnitude than compressive strains. Notably, strains near the peg's fixation channels were relatively low. These results suggest that cracks may initiate around the peg near the backside and travel downward to cause broader fixation failure.

Abstract Image

偏心加载和抬起时髋臼假体外周钉界面力学的体外研究。
解剖型全肩关节假体中使用的盂成形假体一般都带有外周钉,作为承受偏心负荷的设计特征。在正常活动中,这些外围钉和植入物-水泥-骨界面会承受巨大的周期性拉伸-压缩负荷。因此,在将局部假体固定失效的微观力学转化为全肩关节置换术后盂成形假体整体解剖失效的生物力学方面,这些钉子具有重要意义。这项研究使用了一种体外桩-水泥-骨结构,其中包含了从接受全肩关节置换术的骨关节炎患者身上获取的骨组织。在模拟盂兰盆假体边缘位移的加载条件下,分析了周边钉-水泥-骨界面的应变分布。结果发现,界面上的拉伸应变在背面与骨钉交界处附近最高,且幅度大于压缩应变。值得注意的是,钉固定通道附近的应变相对较低。这些结果表明,裂纹可能在靠近背面的钉子周围产生,并向下延伸,导致更广泛的固定失效。
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来源期刊
Journal of Orthopaedic Research®
Journal of Orthopaedic Research® 医学-整形外科
CiteScore
6.10
自引率
3.60%
发文量
261
审稿时长
3-6 weeks
期刊介绍: The Journal of Orthopaedic Research is the forum for the rapid publication of high quality reports of new information on the full spectrum of orthopaedic research, including life sciences, engineering, translational, and clinical studies.
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