Hybrid Assistive Limb Intervention for Hemiplegic Shoulder Dysfunction Due to Stroke

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Robotics

Background:

• Upper limb dysfunction is a common and severe consequence of stroke, often leading to incomplete functional recovery.
• Current rehabilitation strategies for upper limb motor deficits face challenges due to shoulder joint instability and pain during active exercises.
• Exploring novel assistive technologies is crucial for enhancing active rehabilitation efficacy in stroke survivors.

Observation:

• A 54-year-old female with right hemiplegia post-stroke underwent seated, single-joint hybrid assistive limb (HAL) training for right shoulder elevation.
• The patient demonstrated significant improvements in passive and active range of motion (ROM) for shoulder flexion.
• Manual Muscle Test (MMT), Box and Block Test, grip strength, and Action Research Arm Test (ARAT) scores all showed notable gains.

Findings:

• Post-stroke upper limb function significantly improved following HAL-assisted shoulder elevation training.
• Key functional metrics including ROM, muscle strength, dexterity, and overall arm function showed marked enhancement.
• No adverse events, such as shoulder pain, were reported during the intervention period.

Implications:

• The hybrid assistive limb (HAL) shows potential as an effective tool for upper limb rehabilitation in stroke patients.
• This pilot study supports the use of robotic assistance for safe and effective active training of shoulder elevation post-stroke.
• Further research with larger cohorts is warranted to validate HAL's efficacy in diverse stroke populations.