Intermanual Transfer Effects in Below-Elbow Myoelectric Prosthesis Users

Area of Science:

• Rehabilitation medicine
• Prosthetics and orthotics
• Neuroscience

Background:

• Intermanual transfer (IMT) is the phenomenon where training one limb improves performance in the contralateral limb.
• Understanding IMT in individuals with limb loss is crucial for optimizing rehabilitation strategies.
• Myoelectric prostheses offer advanced functionality for individuals with upper limb amputations.

Purpose of the Study:

• To investigate intermanual transfer effects in patients with below-elbow amputation using a myoelectric prosthesis.
• To determine if limb laterality influences these intermanual transfer effects.

Main Methods:

• A case-control study involving 44 participants (22 experienced myoelectric prosthesis users and 22 matched controls).
• Participants performed tasks using a prosthesis simulator attached to their nonaffected arm.
• Outcome measures included movement time, force control, Box and Block test (BBT) scores, and hand opening duration.

Main Results:

• Experienced myoelectric prosthesis users demonstrated shorter movement times and hand opening durations compared to controls.
• Myoelectric prosthesis users achieved significantly higher Box and Block test scores.
• No significant intermanual transfer effects were observed for force control, and no laterality effects were found.

Conclusions:

• Intermanual transfer effects are present in experienced myoelectric prosthesis users with below-elbow amputation, irrespective of limb laterality.
• These findings underscore the clinical value of intermanual transfer training.
• Early initiation of intermanual transfer training post-amputation may enhance functional recovery for individuals with upper limb loss.