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

BACKGROUND: 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. OBJECTIVES: 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. STUDY DESIGN: Socket fabrication methods and socket function were evaluated in a pilot feasibility study. TECHNIQUE: 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. RESULTS: 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. DISCUSSION: Further work is required to determine durability, assess comfort, refine suspension methods, and to develop instructional materials. CONCLUSIONS: 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.

Perceptions of the risks and benefits of upper limb transplantation among individuals with upper limb amputations.

BACKGROUND: Upper limb transplantation is a life-enhancing rather than life-saving procedure. Little research has investigated how individuals with upper limb amputations perceive the benefits and risks of this complex procedure. To address this knowledge gap, the authors conducted qualitative research with individuals with upper limb amputations to understand their perspectives. METHODS: Twenty-two individuals with upper limb amputations (age range, 24 to 73 years) participated in a focus group (n=5) or semistructured interview (n=17) about the benefits and risks of upper limb transplantation. Data were analyzed by means of constant comparative methods and a two-phase analysis process. RESULTS: Participants identified enhanced functional performance and improved appearance as the greatest potential benefits. Over half of participants indicated that function was a more important consideration than appearance. Enhanced function performance was a relative concept strongly influenced by individual expectations, which varied widely. Increased sensation, psychological well-being, and social acceptability were also described as potential benefits. Identified risks included health risks and the demands of transplantation and recovery, decreased functional performance, and uncertainty over outcomes from upper limb transplantation as an experimental procedure. Participants also expressed concerns regarding the psychological impact of negative outcomes and adverse events. CONCLUSIONS: Participants had a large variation in their perceived importance of the many risks and benefits of upper limb transplantation. These findings elucidate how potential upper limb transplantation candidates evaluate the benefits and risks of the procedure. The findings can also inform important issues to address and outcomes to assess in the pretransplant and posttransplant settings.

Neural machine interfaces for controlling multifunctional powered upper-limb prostheses.

This article investigates various neural machine interfaces for voluntary control of externally powered upper-limb prostheses. Epidemiology of upper limb amputation, as well as prescription and follow-up studies of externally powered upper-limb prostheses are discussed. The use of electromyographic interfaces and peripheral nerve interfaces for prosthetic control, as well as brain machine interfaces suitable for prosthetic control, are examined in detail along with available clinical results. In addition, studies on interfaces using muscle acoustic and mechanical properties and the problem of interfacing sensory information to the nervous system are discussed.