Accuracy amidst errors: Evaluating a commercially available wearable sensor system and its associated calibration procedures for monitoring sagittal knee motion in patients undergoing total knee arthroplasty

IF 1.6 4区医学 Q3 ORTHOPEDICS

Knee Pub Date : 2025-04-01 DOI:10.1016/j.knee.2025.03.001

Ryan M. Chapman , Kelly B. Taylor , Emily Kaczynski , Shayan Khodabakhsh , Skye Richards , Jayson B. Hutchinson , Robert C. Marchand

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引用次数: 0

Abstract

Background

Commercially available wearable sensors monitoring knee range of motion (ROM) are gaining traction in orthopaedics, but few studies validate against optical motion capture (MOCAP) in total knee arthroplasty (TKA) patients. Furthermore, wearable calibration is essential for accurate measurements, yet few investigations evaluate calibration and ROM accuracy. This study assessed one commercial wearable sensor system’s calibration (goniometric versus MOCAP) and sagittal knee angle computation accuracy in TKA patients during activities.

Methods

Twenty TKA patients were recruited (5 lost to follow-up). Following a sensor tutorial (MotionSense, Stryker, Mahwah, NJ), participants self-applied sensors for pre-TKA data capture. TKA was then performed by one surgeon followed by identical post-TKA data captures. MOCAP and wearable sensor data were collected during activities. MOCAP sagittal knee angles (θ_MOCAP) were compared to two wearable sensor knee angles: 1) θ_CalGoni = goniometric calibration, 2) θ_CalMOCAP = MOCAP calibration. Two-way ANOVAs evaluated the impact of time (pre-TKA vs. post-TKA) and calibration type (goniometry vs. MOCAP) on calibration angles and wearable sensor error. Variance equality tests compared pre-TKA vs. post-TKA and goniometric vs. MOCAP calibration.

Results

No significant differences were noted pre-TKA vs. post-TKA. Calibration angles differed significantly with goniometry yielding significantly more error than MOCAP. MOCAP calibration reduced error below clinically acceptable levels (<5°) during activities and with significantly less error variance.

Conclusion

MOCAP calibration significant improved accuracy of knee angle computations to acceptable levels (<5°). Accordingly, these wearables are suitable for continuous knee ROM monitoring after calibrating with correct angles, Future studies should investigate specific activities and sensor misplacement on angle measurements.

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误差中的准确性：评估市售可穿戴传感器系统及其相关的校准程序，用于监测全膝关节置换术患者矢状面膝关节运动

商用可穿戴传感器监测膝关节运动范围（ROM）在骨科领域越来越受欢迎，但很少有研究证实光学运动捕捉（MOCAP）在全膝关节置换术（TKA）患者中的应用。此外，可穿戴式校准对于精确测量至关重要，但很少有研究评估校准和ROM精度。本研究评估了一种商用可穿戴传感器系统的校准（角度测量与MOCAP对比）和TKA患者在活动期间矢状膝关节角度计算的准确性。方法招募20例TKA患者，其中5例失访。在传感器教程（MotionSense, Stryker, Mahwah， NJ）之后，参与者自行应用传感器进行tka前数据捕获。然后由一名外科医生进行TKA，随后进行相同的TKA后数据采集。在活动期间收集MOCAP和可穿戴传感器数据。将MOCAP矢状膝关节角度（θMOCAP）与两个可穿戴传感器膝关节角度进行比较：1)θCalGoni =角度标定，2)θCalMOCAP = MOCAP标定。双向方差分析评估了时间（tka前与tka后）和校准类型（测角法与MOCAP）对校准角度和可穿戴传感器误差的影响。方差相等检验比较了tka前与tka后以及角形与MOCAP校准。结果tka前与tka后无显著差异。校正角度因几何角度不同而有显著差异，产生的误差明显大于MOCAP。在活动期间，MOCAP校准将误差降低到临床可接受水平（<5°）以下，并且误差方差显著减小。结论mocap校正将膝关节角度计算精度提高到可接受的水平（<5°）。因此，这些可穿戴设备在校准正确的角度后适用于持续的膝关节ROM监测，未来的研究应调查特定的活动和传感器在角度测量中的错位。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Knee 医学-外科

CiteScore

3.80

自引率

5.30%

发文量

171

审稿时长

6 months

期刊介绍： The Knee is an international journal publishing studies on the clinical treatment and fundamental biomechanical characteristics of this joint. The aim of the journal is to provide a vehicle relevant to surgeons, biomedical engineers, imaging specialists, materials scientists, rehabilitation personnel and all those with an interest in the knee. The topics covered include, but are not limited to: • Anatomy, physiology, morphology and biochemistry; • Biomechanical studies; • Advances in the development of prosthetic, orthotic and augmentation devices; • Imaging and diagnostic techniques; • Pathology; • Trauma; • Surgery; • Rehabilitation.