View clinical trials related to Prostheses and Implants.
Filter by: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.
Lower limb amputation is an emerging global health concern. Currently, there are over 1.6 million amputees in the U.S. and around 6000 new amputations are recorded per annum in the UK. These numbers are expected to double by 2050 due to the increasing aging population and the adverse health issues such as diabetes, representing a significant, growing problem in western society. A lower limb amputation results in the loss of the biological joint structures such as the ankle and knee, along with the associated musculature. In order to overcome these physical losses, many lower limb amputees are provided with a prosthetic limb that enable them to participate in activities of daily living. The design and function of these prosthetic limbs varies widely, with some being very basic, non-articulating, semi-rigid structures while other more advanced components are computer controlled or incorporate robotic function. Lower limb amputees have been shown to fall more often when compared to age matched individuals without lower limb amputation. This has been reported to be partly a result of a less stable walking pattern. Given that the prosthetic limb provided and it's functional capability is a large component of how well a lower limb amputee is able to walk, it is important to understand what the effects of and potential benefits are from using more advanced prosthetic devices, such as micro-processor controlled knee joints and articulating ankle joints. Therefore, the aim of the current study is to investigate the effects of combining more advanced prosthetic ankle-foot and knee components on the biomechanics of activities of daily living in individuals with above knee amputation.
The study evaluates the relation between the rotational alignment of the talar component (phi angle) and the antero-medial ankle pain in patients underwent total ankle replacement, at least one year after surgery. Moreover, the study aims to define a range of the phi angle associated with a lower frequency of antero-medial pain.
Mechanical heart valves (MHV) demand lifelong anticoagulation with vitamin K antagonists (VKA) due to the high thrombogenicity of the prosthesis. Rivaroxaban has previously been tested in experimental and animal models with encouraging results. The investigators recently sent for publication an experiment with 7 patients who used rivaroxaban in metallic prosthesis with encouraging results. In this way it was decided to do a randomized non-inferiority clinical trial comparing rivaroxaban with warfarin in patients with metallic prosthesis.
Patients with craniofacial defects caused by oncologic resection, traumatic events or congenital etiologies suffer from esthetic, functional and psychological problems. Auricular, nasal and orbital defects can be reconstructed with implant retained extra-oral prosthesis. The goal of this study is to evaluate implant survival in temporal, maxillary and orbital bone, and peri-implant tissue reactions using a new implant system developed by BioComp Industries.
Symptomatic and asymptomatic patients wearing Metal on Metal hip prosthesis will be enrolled in the study and periimplant pseudotumors will be searched by means of NMR (Nuclear Magnetic Resonance).
At the department of Cranio-Maxillofacial Surgery, Maastricht University Medical Center (MUMC) the routine procedure after ablation of the nose, ear or eye is reconstruction with an episthesis. Retention can be achieved using adhesives, undercuts or bone implants. Implant based episthesis are now commonly used because of the good retention and episthesis stability. This results in a better patient quality of life. Today we use machined surface implants in the craniofacial region of different brands. Each system has its own instruments and application method. To enhance the clinical usability, we are searching for one system for all extra-oral implant regions. Furthermore, implant patients may be compromised by aging, diseases, smoking, medication and radiation therapy, which can affect the bone healing process. In these cases, implants are known to have higher failure rates compared to the application in healthy cases. Therefore implants with biomechanical surface modifications, such as the HAVD implants of BioComp, may have a positive effect on osseointegration, resulting in higher success rates in the compromised patient. The aim of this pilot study is to collect information about the functionality and safety of a surface treated implant system (HAVD, BioComp) for episthetic reconstruction after ablative surgery in the nasal, orbital and auricular region for a potential future RCT.