Transfemoral Amputation

This prospective randomized controlled trial aims to investigate the effect of dual-task training on balance and fall risk in individuals with unilateral transfemoral amputation using a prosthesis. Forty participants aged 18-60 years will be randomly allocated to either an experimental group receiving dual-task training in addition to conventional therapy or a control group receiving conventional therapy alone. The intervention will be conducted for 8 weeks, 3 sessions per week. Balance and fall risk will be evaluated before and after the intervention using the Biodex Stability System, Berg Balance Scale, and Timed Up and Go Test.

Patients with vascular and metabolic transfemoral amputations experience substantial functional limitations and high rates of prosthetic abandonment. Although multidisciplinary inpatient rehabilitation programs have been associated with improved outcomes, evidence regarding their effectiveness in low- and middle-income countries remains limited. This study aims to evaluate the effectiveness of an inpatient rehabilitation and prosthetic training model implemented at the National Institute of Rehabilitation "Luis Guillermo Ibarra Ibarra" (INRLGII), Mexico. An ambispective cohort design will be used, including a retrospective review of patients treated between 2013 and 2025 and a prospective cohort enrolled between 2026 and 2029. The primary objective is to determine the proportion of patients who achieve functional prosthesis use after hospital discharge. Secondary objectives include identifying clinical, metabolic, functional, and psychosocial factors associated with successful prosthetic use, adherence, and abandonment.

The goal of this clinical trial is to understand the feasibility and effectiveness of using reinforcement learning to personalize robotic prosthetic legs (an experimental prototype) for unilateral transfemoral amputees. The main questions it aims to answer are: * With the developed RL-based Recommendation Interfacing System (RISE), clinicians are able to personalize prosthetic legs faster compared with existing manual personalization procedures. * With the developed RL-based Recommendation Interfacing System (RISE), clinicians are able to personalize prosthetic legs without detailed knowledge about how the prosthetic legs are controlled. * Patients perform better when the prosthetic legs are personalized with RISE system compared with the ones personalized manually Researchers will compare two arms (RISE guided personalization and manual personalization) to see if the tuning speed will increase and if patients can perform better. Participants will go through the standard prosthetic fitting procedures, such as alignment adjustment, then they will experience repeated prosthesis personalization procedures conducted by tuning specialists without RISE, tuning specialists with RISE, and prosthetists (without tuning expertise) with RISE on different types of terrains. In the end, the participants will go through a testing trial, in which they will experience the prototype personalized through the three different approaches without knowing how the control parameters are decided. Their walking performance will be recorded. It is expected that the participants will visit the testing site 8 times, which including alignment (1 visit), three personalization procedures (twice for each), and one testing trial (1-2 visits).

Microprocessor-controlled knees (MPKs) automatically adjust resistance or damping in the joint to improve swing- and/or stance-phase control as appropriate for the prosthesis user during gait. The purpose of this proposed investigation is to determine if there are substantial physical and psychological benefits to fitting lower functioning Veteran ambulators having transfemoral amputations with an MPK compared with a nonmicroprocessor-controlled knee (NMPK). Using a repeated-measures, cross-sectional experimental design, approximately 20 Veterans with unilateral, transfemoral amputations will be evaluated on two separate occasions at the Jesse Brown VA Medical Center or the Edward Hines, Jr. VA Hospital, first with their conventional NMPK and then again after a 2-month accommodation period with the College Park Icon MPK.

The investigators do not yet know how a prosthetic socket with adjustable panels affects the performance of people with a lower limb amputation compared to a conventional prosthetic socket. The primary objective of this study is to compare an adjustable and conventional prosthetic socket and use this information to determine the optimal socket that would improve rehabilitation and function in people with lower limb amputation.

The purpose of this industry-initiated research study is to test that a powered microprocessor controlled knee improves metabolic function during walking in level and sloped conditions as compared to the subject's physician prescribed prosthesis.

The purpose of this study is to evaluate the performance and adaptability of a neural-controlled powered knee or ankle prosthesis across diverse real-world mobility tasks. This research aims to assess how compare the sense of embodiment with the device, symmetry, and stability of a person with an lower-extremity amputation walking with a bionic prosthesis and their prescribed prosthesis. Findings from this study will inform future developments in bionic prosthesis design with optimal integration with the human body, with the goal of improving prosthetic integration into daily life.

Microprocessor-controlled knees (MPKs) do not typically utilize motors to power joint rotation, but they automatically adjust resistance or damping in the joint to improve swing- and/or stance-phase control as appropriate for the prosthesis user during gait. The Ossur Power Knee is the only commercially-available MPK that uses a motor to provide active power generation during walking and other activities. The purpose of this proposed investigation is to perform and compare biomechanical evaluations of the Power Knee and Ossur Rheo XC, a passive MPK, during walking and other activities by prosthesis users. Furthermore, mobility between male and female subjects will be compared to determine if there are differences in prosthetic knee usage on the basis of sex.

The goal of this observational study is to learn how muscle strength, balance, and functional ability are affected in people with above-knee (transfemoral) amputations. The main questions it aims to answer are: How does the length of the lost part of the leg, compared to the intact leg, affect muscle strength, balance, and functional capacity? Is muscle strength at specific lower limb joints related to balance and performance ? Participants will: Have muscle strength measured at all intact lower limb joints using an isokinetic dynamometer Complete balance assessments using force platform technology that measures weight distribution and evaluates both static and dynamic balance Perform a six-minute walk test to evaluate endurance and functional capacity The study will help improve understanding of how limb length and joint-specific muscle strength impact mobility, supporting the development of better rehabilitation programs for amputees.