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A Lightweight Multi-Articular Passive Exoskeleton Using a Single Elastic Band to Improve Crouch Gait Pattern: A Pilot
Insights
A new lightweight, passive exoskeleton helps children with cerebral palsy (CP) achieve a more upright gait by assisting hip, knee, and ankle movement. This innovative device shows promise for improving mobility and reducing energy expenditure in children with crouch gait.
Area of Science:
- Biomedical Engineering
- Rehabilitation Technology
- Pediatric Orthopedics
Background:
- Crouch gait in children with cerebral palsy (CP) leads to reduced mobility and increased energy use.
- Existing interventions like surgery and orthotics require ongoing support and practice.
- Current powered exoskeletons are often too heavy and complex for practical application.
Purpose of the Study:
- To develop and evaluate a novel, lightweight, passive exoskeleton for assisting children with CP and crouch gait.
- To investigate the biomechanical effects of a single-elastic-band, multi-joint passive exoskeleton on gait parameters.
Main Methods:
- A lightweight, passive exoskeleton was designed with a garment-like waist belt and carbon-fiber components.
- The device provides self-adjusting, posture-dependent torque without sensors or active control.
- Biomechanical effects were assessed in four children with CP (GMFCS I-III) during overground walking, comparing baseline and exoskeleton conditions.
Main Results:
- The exoskeleton tended to increase hip extension by 3.5° and knee extension by 3.3° during the stance phase.
- Ankle plantarflexion increased by 1.4°, indicating a more extended gait posture.
- Joint range of motion increased: hip by 1.7°, knee by 4.2°, and ankle by 8.5°, suggesting no restriction of dynamic movement.
Conclusions:
- The developed passive exoskeleton is mechanically feasible for assisting a more upright gait in children with crouch gait.
- Passive, multi-joint assistance strategies show potential for improving gait patterns in pediatric CP.
- The lightweight, user-centric design enhances wearability and practicality for rehabilitation.
Abstract:
Crouch gait, characterized by excessive flexion of the lower-limb joints, is a common gait disorder among children with cerebral palsy (CP) that compromises mobility and increases energy expenditure. Although surgical and orthotic interventions can improve alignment, maintaining these benefits requires continued postural support and gait practice. While powered exoskeletons have been developed to support upright and coordinated movement, they are often too heavy and complex for practical use. To address this, we developed a lightweight passive exoskeleton that assists the hip, knee, and ankle simultaneously using a single elastic band. The device is designed to provide self-adjusting torque dependent on posture without the need for sensors or active control. It also features user-centric design components to ensure wearability and lightness through a garment-like waist belt and carbon-fiber knee-ankle exoskeleton. We evaluated the biomechanical effects of the exoskeleton in four children with crouch gait (GMFCS levels I-III) by comparing baseline and exoskeleton conditions during overground walking. The preliminary results showed that the exoskeleton tended to increase the mean hip and knee extension angles during the stance phase by 3.5° and 3.3°, respectively, and increased ankle plantarflexion by 1.4°, indicating the mechanical feasibility of assisting a more extended gait posture. Furthermore, the range of motion of the joints increased by 1.7° in the hip, 4.2° in the knee, and 8.5° in the ankle, suggesting that the passive assistance does not restrict motion and may allow for dynamic joint movement. These preliminary findings suggest the feasibility of passive, multi-joint assistance strategies to facilitate more upright gait patterns in children with crouch gait.
