The reversible adjustable coupling: A lightweight and low-cost alignment component for the lower limb prosthesis

Area of Science:

• Biomedical Engineering
• Prosthetics and Orthotics

Background:

• Lower limb prosthesis alignment is crucial for optimal patient gait and function.
• Current alignment components are prohibitively expensive for low-income countries.
• There is a need for affordable prosthetic alignment solutions.

Purpose of the Study:

• To develop a lightweight and low-cost alignment coupler for lower limb prostheses.
• To create an accessible prosthetic fitting solution for resource-limited settings.

Main Methods:

• Designed and manufactured a reversible adjustable coupling.
• Recorded measurements of anterior/posterior, medial/lateral, and rotational adjustments.
• Performed mechanical testing, including repetitive loading, static, and strength tests.
• Assessed ease of use.

Main Results:

• The coupler allowed acceptable anterior/posterior and medial/lateral translation.
• It provided 30° of internal and external rotation.
• Mechanical tests, including 2000 cycles of repetitive loading, were successful.
• The component weighed 166g and cost $55.00 USD.

Conclusions:

• The reversible adjustable coupling offers adequate adjustment ranges for prosthesis alignment.
• It is suitable for both exoskeletal and endoskeletal prostheses.
• The low cost and weight make it an affordable option for low-income countries in clinical and educational settings.