Abstract
With the aging of population, the number of total hip replacement (THR) surgeries increases year by year. To improve the success rate of THR operation, the measurement of acetabular prosthesis angles should be precise during the surgery. We design an inertial measurement unit based real-time measurement system, which measures the initial attitude of the pelvis coordinate, and traces the real-time attitude of the pelvis coordinate and prosthesis axis. By collecting real-time data of diff- erent pelvic and prosthesis attitudes in quaternion representation through accelerometers and gyroscopes, the relative position between pelvis and prosthesis is calculated in real time. An optimized algorithm is proposed to obtain prosthesis implant angles accurately from the data. The experimental results show that the measured implant angles agree with that calculated by radiographic value, the root mean square errors (RMSE) are less than 3.52 degrees, which is within the safe range of THR requirement. Furthermore, no matter how the implant angles change, the measured values agree with reference values, the RMSE is less than 3.27 degrees. The experimental results show that our system can trace the real-time dislocation of the prosthesis during the THR surgeries.
Highlights
W ITH the aging of society, there is a trend that the number of people suffering from hip joint diseases is increasing year by year
This paper proposes a magnetometer-free inertial measurement unit (IMU)-based system with a quaternion-based algorithm for real-time measurement of the acetabular prosthesis implant angle during total hip replacement (THR) surgery
The system consists of 3 parts: initial attitude measurement instrument (IAMI), real-time attitude measurement instrument (RAMI), and prosthesis attitude measurement instrument (PAMI)
Summary
W ITH the aging of society, there is a trend that the number of people suffering from hip joint diseases is increasing year by year. According to the national institute of health (NIH), about 208,600 total hip replacement (THR) surgeries were performed in the United States in 2005, and the Manuscript received April 26, 2021; revised June 15, 2021; accepted June 18, 2021. Date of publication June 22, 2021; date of current version August 31, 2021.
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