Orthopaedic and Rheumatologic Institute, Cleveland Clinic, Cleveland, OH, USA.
J Shoulder Elbow Surg. 2013 Nov;22(11):1530-6. doi: 10.1016/j.jse.2013.01.018. Epub 2013 Mar 22.
Posterior glenoid bone loss is found in a majority of patients with advanced osteoarthritis of the shoulder. In total shoulder arthroplasty, several methods currently exist for management of this bone loss, including the use of an augmented glenoid component. Different augmented glenoid designs would be expected to vary in their resistance to loosening during mechanical bench-top testing. Our hypothesis is that a stepped augmented glenoid component will have less mechanical liftoff than augmented components of varying designs without a step.
Four glenoid prototypes articulated with a humeral head were loaded with a 170-lb compressive load and with 4 mm of posterior-superior translation of the humeral head to 100,000 cycles. Anterior glenoid liftoff was measured.
The stepped glenoid component had significantly lower liftoff values (P < .05) compared with several other designs at many of the test intervals.
A stepped design for an augmented glenoid component has superior fixation and less anterior glenoid liftoff in the presence of eccentric loading and may have better long-term clinical results.
在后盂骨损失的发现，在大多数患者的晚期骨关节炎的肩膀。在全肩关节置换术，目前有几种方法来管理这种骨丢失，包括使用增强的盂骨组件。不同的增强盂骨设计预计会有所不同，其阻力松动在机械板凳测试。我们的假设是，一个阶梯式增强盂骨组件将有较少的机械架空比增强组件不同的设计没有一步。
四个盂骨原型与肱骨头关节加载与 170 磅的压缩负荷和与 4 毫米的后上部翻译的肱骨头 100000 个周期。前盂骨架空测量。
阶梯式盂骨组件有明显较低架空值（P <.05）相比，其他几个设计在许多测试间隔。
一个阶梯式设计的增强盂骨组件有优越的固定和少前盂骨架空偏心负载的存在，可能有更好的长期临床结果。
