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首页> 外文期刊>Journal of orthopaedic research >An experimental glenoid rim strain analysis for an improved reverse anatomy shoulder implant fixation
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An experimental glenoid rim strain analysis for an improved reverse anatomy shoulder implant fixation

机译：实验性盂盂缘应变分析，用于改进反向解剖肩关节植入物的固定

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摘要

Loosening of glenoid components in TSA is a main cause of failure. In reverse anatomy TSA designs used for unstable joints, fixation is particularly demanding. Strains developed around the glenoid rim of biomechanical sawbone scapulae implanted with (a) the original fixed-fulcrum Bayley-Walker glenoid prosthesis in current clinical use, and (b) a revised version with conical crosssection, were compared. The conical shape of the revised design was hypothesized to produce greater strains in the glenoid rim than the original tapered screw design. The 2D strain field at three accessible locations around the rim of each scapula was measured with three-element rosette strain gauges for two types of simulated cancellous bone fill under applied physiologically relevant loads. The average strain energy densities around the rim for the conical design were greater than for the original design by a factor of 1.55-2.25 for all loading conditions. Results indicate that a significantly greater proportion of load was directed toward cortical bone in the conical design, thus promoting cortical bone loading.
机译：TSA中关节盂部件松动是故障的主要原因。在用于不稳定关节的反向解剖TSA设计中，固定要求特别高。比较了在生物力学锯齿肩cap骨盂缘周围生长的应变，该应变植入了（a）当前临床使用的原始固定支点Bayley-Walker盂盂假体，以及（b）具有圆锥形横截面的修订版本。假设修改后的设计的圆锥形会比原始的锥形螺丝设计在盂状缘产生更大的应变。使用三元玫瑰花形应变仪在施加的生理相关载荷下，针对两种类型的模拟松质骨填充物，测量了每个肩骨边缘周围三个可及位置的2D应变场。在所有载荷条件下，圆锥形设计的轮辋周围的平均应变能密度比原始设计大1.55-2.25倍。结果表明，在圆锥形设计中，显着更大比例的载荷指向皮质骨，从而促进了皮质骨载荷。

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