Abstract：Objective To expound the development process of a portable knee joint rehabilitation detection system for clinical
application. Methods The system was composed of brace, signal acquisition module and human-computer interaction module.
According to the design requirements,the characteristics of flexibility, resistance variability, range and accuracy were determined,and
the system variable resistance measurement mode was set to measure key functional data such as range of motion (ROM) and
muscle strength of the knee joint. Four healthy subjects were selected to participate in the system performance test experiment and
calculate the system accuracy. Results The simulation test results showed that typically within 3 cycles, ROM was obtained. The
system performance test results indicated that the Rmae measured by ROM of knee joint for 4 subjects was ≤0.6°, and the Rme <1.5°.
Tmae <0.15 Nm, and the Tme <0.4 Nm. The retest reliability within the subject group within 3 d was between 0.8988 and 0.9511.
The measuring range of ROM was 95°and the measuring range of muscle strength was 28.4 Nm. The spring stiffness of the
system was 0.2989 Nm/°, and the system included three resistance modes with corresponding ranges of 16.89, 24.38 and 28.40 Nm
respectively. Conclusion The proposed test plan in this study has an effective ROM test effect. The portable knee joint rehabilitation
assessment system can provide a safe and comfortable measurement environment for early postoperative knee joint rehabilitation
of patients. It effectively reduces the measurement errors caused by random constraints between the lower limbs and brace, meeting
the requirements for postoperative knee joint rehabilitation assessment. It also meets the clinical needs for tracking rehabilitation
progress and evaluating rehabilitation programs.
陈敬伟1，贾真2，张翼1，王靖2，邓华1，刘杨3. 面向临床的便携式膝关节
康复检测系统设计[J]. 中国医疗设备, 2023, 38(10): 20-26.
CHEN Jingwei1, JIA Zhen2, ZHANG Yi1, WANG Jing22, DENG Hua1, LIU Yang3. Design of Portable Knee Rehabilitation Testing System for Clinical Practice. China Medical Devices, 2023, 38(10): 20-26.
