NIH Release/Relock Socket

This study is evaluating a new prosthetic socket system — called the NIH Release/Relock Socket — designed for people who have had a below-knee (trans-tibial) amputation. The socket is the part of a prosthetic limb that connects to the residual limb. Traditional sockets can be hard to put on and take off and may not provide optimal comfort or stability. This new design aims to make it easier to don and doff (put on and remove) the prosthesis while maintaining secure attachment during walking. Participants will test the new socket design in both in-person and remote (virtual) settings. Researchers will assess comfort, security, ease of use, and walking performance compared to standard sockets. Both in-person and remote participation options are available. You may be eligible if you: - Had a below-knee (trans-tibial) amputation at least 18 months ago - Regularly wear a prosthesis for at least 7 hours per week - Have a residual limb at least 9 cm in length - Are classified as K2 mobility level or higher (capable of limited or unlimited community ambulation) - Can walk continuously with a prosthesis for at least 2 minutes and can sit, stand, and step up 5 cm For remote participation, you also need to: - Have a spare prosthesis available - Have no cognitive issues - Have adequate hand dexterity and strength - Be able to participate via video call (Zoom) You may NOT be eligible if you: - Currently have skin breakdown on your residual limb - Cannot meet the inclusion criteria above Talk to your doctor to see if this trial is right for you.