A novel, low-cost transradial socket fabrication method using mass-producible components and expanding rigid foam.

Abstract

Millions of people in low- and middle-income countries lack access to prosthetic care. A well-fitting, durable socket is important for prosthesis comfort and function, but conventional fabrication techniques require highly trained clinicians and specialized equipment. To increase access to prosthetic care by developing a simple, low-cost socket fabrication method that does not require specialized equipment or electricity, and can be performed by persons with minimal prosthetic training. Socket fabrication methods and socket function were evaluated in a pilot feasibility study. We describe a rapid method for fabricating a rigid foam socket directly over the residual limb, with a mass producible, strong, cosmetically appealing plastic outer shell. We fabricated sockets for four individuals with unilateral transradial amputations and evaluated socket function. An individual with no formal prosthetic training was able to fabricate sockets and assemble a functional, comfortable prosthesis system within 90 min. All necessary supplies can be provided in a kit for under US$100. Further work is required to determine durability, assess comfort, refine suspension methods, and to develop instructional materials. We developed a simplified, inexpensive method to fabricate sockets on the residual limb using expandable foam with an integrated cosmetic/structural covering (i.e. an exoskeletal system), for persons with transradial amputation. A transradial prosthesis socket can be fabricated in around 90 min. and all necessary materials, tools, and written instructions for fabrication and fitting can be provided in a kit. Specialized equipment and electricity are not required. Instructions for fabrication and fitting can be provided in multiple languages using online videos.