Mapping Lower-Limb Prosthesis Load Distributions Using a Low-Cost Pressure Measurement System.

Area of Science:

• Biomedical Engineering
• Rehabilitation Technology
• Prosthetics and Orthotics

Background:

• Major limb amputation affects 55,000 people in the UK.
• Prosthetic socket discomfort and poor fit are common issues, leading to skin problems.
• Improved socket design is crucial for user comfort and prosthesis acceptance.

Purpose of the Study:

• To evaluate a prototype low-cost system for assessing in-socket loading distribution.
• To understand how loading profiles relate to prosthetic socket design and fit.
• To determine the system's ability to assess loading during walking in amputees.

Main Methods:

• A system combining pressure sensors and an inertial measurement unit was developed.
• The prototype was tested on four transtibial amputee participants.
• Sensors were embedded in sockets, and measurements were taken during level walking.

Main Results:

• The system dynamically collected data on in-socket loading profiles.
• Results aligned with expected loading patterns for patellar-tendon-bearing and total-surface-bearing sockets.
• Identified specific pressure regions and a case of socket-foot misalignment.

Conclusions:

• The sensors provide objective, accurate data on prosthetic socket pressure distributions.
• This technology can assist in fitting complex residual limbs and for users with reduced sensation.
• Objective pressure data complements subjective user feedback for improved prosthetic care.