膝关节力学平衡无线测量装置的研制

Development of a force-balance telemetry device for total knee arthroplasty

目的为更好的测量股骨-胫骨接触面的压力平衡状况,本研究开发一种新的膝关节力学平衡无线测量系统。方法本装置根据人工膝关节胫骨假体的外形和结构进行设计,将力学传感器和无线测量电路嵌入其中,在全膝关节置换(TKA)手术过程中替代胫骨假体试样,测量膝关节各个屈伸角度下股骨与胫骨间的作用力大小,帮助医生通过松解膝关节周围软组织来调节张力的平衡。结果测试结果表明,本装置具有较好的测量精度(r>0.98,RMS=65g),能满足临床测量精度的要求。结论利用本装置测量股骨-胫骨接触面的压力平衡状况对确定假体安装位置以及选择合适膝关节的假体垫片具有指导意义。

Objective A new type of tibial-femoral force-balancing telemetry device was developed for measuring force balance on the tibial-femoral contact surface in knee joint. Method The force-balance telemetry device was designed imitating the configuration of tibial part of total knee prosthesis,in which force sensors and telemetry circuit were embedded. During total knee arthroplasty（TKA）,this device was implanted as a tibial prosthesis to measure tibial-femoral force while the knee joint was being placed at different angles. The tension balance was adjusted by releasing soft tissue around knee joint. Results The results indicat that this device has advantage of high accuracy for force measurement （r〉0.98,RMS= 65 g）,which is sufficient to meet clinical demand. Conclusions The measurement of force balance on the tibial-femoral contact surface with telemetry device can provide new insight into the estimation of optimal knee prosthesis position and selection of appropriate polyethylene insert.