刚度
植入
肩关节
扭矩
关节置换术
偏转(物理)
生物医学工程
肩关节假体
生物力学
口腔正畸科
接头(建筑物)
材料科学
结构工程
外科
工程类
医学
复合材料
物理
生理学
光学
热力学
作者
Nikolas Förstl,Franz Süß,Carsten Englert,Sebastian Dendorfer
标识
DOI:10.1016/j.medengphy.2023.104059
摘要
To avoid dislocation of the shoulder joint after reverse total shoulder arthroplasty, it is important to achieve sufficient shoulder stability when placing the implant components during surgery. One parameter for assessing shoulder stability can be shoulder stiffness. The aim of this research was to develop a temporary reverse shoulder implant prototype that would allow intraoperative measurement of shoulder stiffness while varying the position of the implant components. Joint angle and torque measurement techniques were developed to determine shoulder stiffness. Hall sensors were used to measure the joint angles by converting the magnetic flux densities into angles. The accuracy of the joint angle measurements was tested using a test bench. Torques were determined by using thin-film pressure sensors. Various mechanical mechanisms for variable positioning of the implant components were integrated into the prototype. The results of the joint angle measurements showed measurement errors of less than 5° in a deflection range of ±15° adduction/abduction combined with ±45° flexion/extension. The proposed design provides a first approach for intra-operative assessment of shoulder stiffness. The findings can be used as a technological basis for further developments.
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