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    • Intraoperative Sensor Technology Quantifies Inter-Prosthesis Pressure for Predicting Lower Limb Alignment after Oxford Unicompartmental Knee Arthroplasty.

    Juncheng Ge,Xiaowei Sun,Changquan Liu,Qidong Zhang,Bailiang Wang,Wanshou Guo

    Frontiers in Bioengineering and Biotechnology（2023）SCI 3区SCI 2区

    Peking Univ | China Japan Friendship Hosp

    Cited 1|Views22
    Abstract
    Purpose: The aim of this study is to quantify inter-prosthetic pressures at different knee angles in Oxford unicompartmental knee arthroplasty (OUKA) and its correlation with postoperative lower limb alignment. Methods: This study included 101 patients (122 knees) who underwent OUKA from March 2022 to July 2022. The previously designed matrix flexible force sensor was used to measure the inter-prosthesis pressure of different knee joint angles during the UKA operation, and the force variation trend and gap balance difference were obtained. The correlation between inter-prosthesis pressure and postoperative lower limb alignment index including hip-knee-ankle angle (HKAA) and posterior tibial slope (PTS) was analyzed. The effect of PTS change (ΔPTS) on the inter-prosthesis pressure and the range of motion (ROM) of the knee joint was analyzed. Radiographic and short-term clinical outcomes of included patients were assessed. Results: The inter-prosthesis pressure of the different knee joint angles during the operation was not consistent. The mean inter-prosthesis pressure and gap balance difference were 73.68.28 ± 41.65N and 36.48 ± 20.58N. The inter-prosthesis pressure at 0° and 20° was positively correlated with postoperative HKAA (p < 0.001). ΔPTS was positively correlated with the pressure at the end of knee extension and negatively correlated with the pressure at the end of knee flexion (p < 0.001). The HKAA, ROM, degree of fixed knee flexion deformity, and knee society score of the included patients were significantly improved compared with those before the operation (p < 0.001). Conclusion: The inter-prosthesis pressure measured at the knee extension position can predict postoperative HKAA to some degree. Changes in PTS will affect the inter-prosthesis pressure at the end of flexion and end of knee extension, but this change is not related to the range of motion of the knee joint.
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    Oxford unicompartmental knee arthroplasty (UKA),limb alignment,posterior tibial slope (PTS),pressure sensor,hip-knee-ankle angle (HKAA)
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    【要点】：本研究通过术中传感器技术量化了牛津单间室膝关节置换术中不同膝关节角度间的假体压力，并探讨了其与术后下肢对线关系的关联性，为预测术后膝关节对线提供了一种新方法。
    

    【方法】：使用自定义的柔性力矩阵传感器测量101位患者在牛津单间室膝关节置换手术中不同膝关节角度的假体间压力，并分析这些压力与术后下肢对线指标如髋膝踝角（HKAA）和胫骨后倾角（PTS）的关系。
    

    【实验】：患者在2022年3月至2022年7月期间接受了手术，实验中收集的数据包括不同膝关节角度的假体压力和间隙平衡差异，并通过影像学评估和短期临床结果来评估手术效果。结果显示，术中不同膝关节角度的假体压力存在差异，且与术后的HKAA和PTS有显著相关性。胫骨后倾角变化（ΔPTS）与膝关节伸展末的压力呈正相关，与膝关节屈曲末的压力呈负相关。患者的HKAA、活动范围（ROM）、固定膝关节屈曲畸形程度和膝关节社会评分术后均有显著改善。
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