View clinical trials related to Amputation.
Filter by:The goal of this study is to understand how providing power at the knee or ankle individually, or providing power at both the knee and ankle, impacts ambulation for K2 level transfemoral amputees. Aim 1: measure functional performance of K2 level ambulators when using a commercially available passive microprocessor knee prosthesis (Ottobock Cleg/Ottobock foot) or a powered knee and ankle prosthesis (SRALab Hybrid Knee and SRAlab Polycentric Powered Ankle. Aim 2: Participants will be evaluated on the contribution of adding power at the knee only or the ankle only. Aim 3: The investigators will evaluate the functional performance after intensive clinical gait training on the powered knee and ankle prosthesis (SRALab Hybrid Knee and SRALab Polycentric Powered Ankle). Our hypothesis is that providing powered componentry will improve function and that intensive training will magnify those improvements.
The goal of this study is to utilize the Gaze and Movement Assessment (GaMA) metric to assess the effect of different prosthetic components on compensatory movements used to complete activities of daily living.
This study investigates prosthetic users´ report of passive microprocessor-controlled knees (pMPK) vs. active microprocessor-controlled knees (aMPK). Outcome measurements are assessed at baseline with the pMPK and after 4 weeks of continuous use of aMPK. Measurements consists of functional outcomes, as well as patient-reported outcomes.
The aim of our study is; To evaluate the functionality of lower extremity unilateral amputees, to ensure that the results of the Medicare Functional K Classification System, which provides subjective data for the evaluator, become an objective evaluation method and to determine the functional levels of unilateral amputees; To create an objective data set by applying one-leg standing test, ten meter walking test, L test, figure-8 walking test, joint range of motion, amputee mobility estimator scale, houghton scale and joint position sense evaluation tests.
Individuals with an above-knee lower limb amputation are known to walk more slowly, expend more energy, have a greater risk of falling, and have reduced quality of life compared to individuals without amputation and those with below knee amputation. One of the driving factors behind these deficits is the lack of active function provided by above-knee prostheses with prosthetic knees and ankles. While many prosthetic devices have been developed for functional restoration after major lower extremity amputation, there remains no stable interface to facilitate reliable, long-term volitional control of an advanced robotic limb capable moving multiple joints. Moreover, there is no existing interface that provides useful sensory feedback that in turn enhances the functional capabilities of the prosthesis. To achieve both greater signal specificity and long-term signal stability, we have developed a biologic interface known as the Regenerative Peripheral Nerve Interface (RPNI). An RPNI consists of a peripheral nerve that is implanted into a free muscle graft that would otherwise go unused in the residual limb. As the nerve grows, it reinnervates the free muscle graft which undergoes a predictable sequence of revascularization and regeneration. The main questions it aims to answer are: 1. Can the amplitude, movement specificity and stability of sciatic nerve RPNI electromyography (EMG) signals be detected up to one year post RPNI surgery? 2. Do RPNIs contain information to enable control of a physical motorized prosthetic leg with multiple degrees of freedom? 3. Does stimulation of sciatic nerve RPNIs provides meaningful sensory feedback? Consenting participants with unilateral transfemoral amputation (TFA) will: 1. Undergo RPNI surgery and electrode implantation in the residual limb. 2. Attend regular follow-up visits following surgery to assess the health and signal strength of the RPNIs and their ability to use a prescribed prosthesis between 3- and 12-months following implantation. 3. Undergo explantation of electrodes following the conclusion of data collection.
The goal of this observational study is to compare thermographic values in the knee region of the healthy extremity and the amputated extremity and learn about the relationship between thermographic value and pain in the knee region of the amputated extremity. The main questions it aims to answer are: 1. Do thermal values in the knee region of the amputated extremity and the intact extremity differ in individuals with transtibial amputation? 2. Is there a relationship between the pain felt in the knee region of the amputated limb and the difference in thermal values between the extremities in individuals with transtibial amputation?
People with lower extremity amputation (LEA) have persistent problems with balance, falls, residual limb pain, functional mobility, cognitive attention during gait, and satisfaction with participation in daily activities, despite using prostheses. The purpose of this randomized clinical trial is to advance understanding of how dynamic foot design features may help people with LEA This study will include people with above-knee amputations, or with bilateral amputations, or with below-knee amputations and lower levels of mobility. The main study questions/goals are: 1a) To determine if frontal plane adaptation in a foot prosthesis impacts performance, comfort, activities of daily living, and community mobility in the study populations. To answer this question, we will compare a locked and unlocked version of the novel prosthesis. 1b) To determine how the unlocked investigational foot condition compares to the person's usual foot using the outcomes listed above. 2) To examine the participants' lived experience during community activities. The study will use performance tests, questionnaires, logbooks, and interviews to monitor person-centered outcomes and perceptions of personal functioning during the use of the investigational foot (locked and unlocked) compared to the person's usual foot.
A national, multi-center registry of patients using lower-limb prosthesis, their profiles and devices, and their long-term follow-up and clinical outcomes.
The goal of this proposed project is to gather community-based data from the K2-level Transfemoral Amputee (TFA) population to aid in evidence-based prescription of powered prosthetic knees (i.e., choosing the right device to maximize the benefit for each patient). The investigators intend to use this trial data along with a concurrent study being conducted within the K3-K4 level population to guide the implementation of effective prescriptions towards those that can benefit most from a given device and limit prescription to those who would not see benefit in order to ensure the most judicious use of Department of Defense (DoD) and Veteran's Affairs healthcare dollars. The findings will also be shared with the research community to help drive the design of future devices by identifying what features and functions are most beneficial to which patient populations when the devices are used outside of the laboratory. In summary, more community-based data on how powered prosthetic knees compare with the current standard in TFA populations is needed to allow for improved clinical decision making and clinical outcomes.
Lower limb amputees rely on their prosthetic to remain active and lead an independent life. In recent years, measuring residual muscle activity has been used to interpret a user's intent and thereby modulate prosthesis control. However, little knowledge is held on how residual muscle activity differs from non-amputated muscle. The research team will analyze and compare neuromuscular physiology in non-amputee individuals and amputees' non-amputated and residual muscles across functional tasks to better understand how amputees control their muscles. Such information will inform design of modern prosthesis controllers.