Design and Preliminary Evaluation of a Gait Control Strategy for Hip-Knee-Ankle-Foot Prostheses With Motorized Hip Joint

IF 5.2 2区 医学 Q2 ENGINEERING, BIOMEDICAL
Farshad Golshan;Edward Lemaire;Hossein Gholizadeh;David Nielen;Natalie Baddour
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Abstract

Hip disarticulation (HD) amputees face mobility challenges due to the loss of hip, knee, and ankle joints. Current hip-knee-ankle-foot (HKAF) prostheses are entirely passive and require excessive compensatory movements to operate, leading to fatigue and long-term complications. Seeking to address these limitations, this study developed a HD user-centric, walking speed adaptable control strategy paired with a hip-motorized HKAF to emulate gait characteristics of transfemoral amputees. A prototype “Power Hip” was instrumented with internal sensors (IMUs, load cells, joint encoders) to create a prosthetic unit that could be worn without the need for external sensors. A hierarchical gait control strategy was developed to utilize these sensors to calculate the desired hip states and actuate the joint. To evaluate capabilities of the control strategy, an HD amputee participant was recruited to undergo training with Power Hip. Once training was complete, motion captured kinematics and onboard sensor data were analyzed across slow, self-paced, and fast walking speed trials. The Power Hip enabled walking speeds of 0.69–1.01 m/s, with stride parameters aligning with transfemoral amputee outcome measures. Hip extension velocities (60.2–104.9°/s) matched transfemoral kinematics, though swing-phase knee flexion magnitude and velocity were reduced compared to transfemoral benchmarks. The prototype demonstrated a 52° hip range of motion, surpassing conventional passive hip joints, and adapted to speed changes automatically. This research paves the way for advanced prosthetic solutions to improve quality of life for people with hip-level amputations.
机动髋关节髋关节-膝关节-踝-足假肢步态控制策略设计与初步评价。
髋关节脱臼(HD)截肢者由于髋关节、膝关节和踝关节的丧失而面临行动困难。目前的髋关节-膝关节-踝关节-足(HKAF)假体是完全被动的,需要过度的代偿运动来操作,导致疲劳和长期并发症。为了解决这些局限性,本研究开发了一种以HD用户为中心的步行速度自适应控制策略,并与髋关节机动HKAF配对,以模拟经股截肢者的步态特征。一个原型“动力髋关节”配备了内部传感器(imu,称重传感器,关节编码器),以创建一个无需外部传感器即可佩戴的假肢单元。开发了一种分层步态控制策略,利用这些传感器计算所需的髋关节状态并驱动关节。为了评估控制策略的能力,我们招募了一名HD截肢者接受Power Hip的训练。一旦训练完成,运动捕获的运动学和机载传感器数据将在慢速、自定节奏和快速步行试验中进行分析。Power Hip使步行速度达到0.69-1.01 m/s,步幅参数与经股骨截肢者的预后指标一致。髋关节伸展速度(60.2-104.9°/s)与经股运动相匹配,但与经股基准相比,摆动阶段膝关节屈曲幅度和速度有所降低。该原型展示了52°的髋关节运动范围,超越了传统的被动髋关节,并能自动适应速度变化。这项研究为先进的假肢解决方案铺平了道路,以改善髋部截肢患者的生活质量。
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
CiteScore
8.60
自引率
8.20%
发文量
479
审稿时长
6-12 weeks
期刊介绍: Rehabilitative and neural aspects of biomedical engineering, including functional electrical stimulation, acoustic dynamics, human performance measurement and analysis, nerve stimulation, electromyography, motor control and stimulation; and hardware and software applications for rehabilitation engineering and assistive devices.
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