A Lightweight Multi-Articular Passive Exoskeleton Using a Single Elastic Band to Improve Crouch Gait Pattern: A Pilot...

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.