Dual Mobility Cups Clinical Trial
Official title:
In Vivo Study of the Dual Mobility Cup Stability and Mobility Using Ultrasound Imaging
The concept of dual mobility cup (DMC), developed in the 1970s by Gilles Bousquet, allows a greater motion and a better stability of the implants, reducing the prosthetic dislocations frequency in at-risk populations. This type of prosthesis has a small-diameter head that ensures a low wear rate and a large-diameter head, with a polyethylene liner, to increase prosthetic stability. This prosthesis has survival rates comparable to those found with conventional prostheses. However, actually, its in vivo behaviour has not yet been established, leading orthopaedic surgeons to keep this concept for patients with a high risk of dislocation (elderly subjects, neurological pathologies, spinal pathologies, falls, etc.). To date, no in vivo studies have been carried out - non-invasively and dynamically - to understand the biomechanical behaviour and the stability properties of the dual mobility cup implanted in patients. The objective of this study is to visualize and quantify the in vivo movement of the polyethylene liner using 3D ultrasound imaging. The second objective is to obtain in vivo data (using the motion analysis system and the force platform) allowing the use of a musculoskeletal model to improve the understanding of the prosthetic dislocation phenomenon. Participants will carry out daily life activities (walk, chair up, etc.). During this study, liner ultrasound acquisitions and motion analysis of the lower limb will be performed, thanks to a movement analysis system composed of cameras coupled to a force platform. Hip kinematics will be obtained from the motion analysis data and will be based on the model of Leardini et al. 2007. The position of the liner and liner plane will be determined using 3D ultrasound data. The abduction and anteversion motion of the liner plane will be measured relative to the pelvic landmark.
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