Aseptic Loosening Clinical Trial
Official title:
Fluoroscopic and RSA Evaluation of the Triathlon Total Knee Prosthetic Design
The goal of this study is to compare the fixed bearing (FB) Triathlon knee (Stryker, USA) and the mobile bearing (MB) Triathlon knee (Stryker, USA) and study the effect of implant design on kinematics and micromotion. During two tasks the kinematics measured with fluoroscopy (kinematics and movement of the polyethylene bearing). Roentgen Stereophotogrammetric Analysis (RSA) will be used to evaluate micromotion between prosthesis and the bone for the MB and FB Triathlon knee.
The goal of this study is to perform a kinematic evaluation of a MB and FB knee prosthesis
designs (Triathlon, Stryker, USA), by means of fluoroscopy and RSA and compare the different
designs. The findings of this study will contribute to improve total knee designs and improve
rehabilitation strategies.
Objectives:
1. To evaluate if there is micromotion of the prosthesis with respect to the bone and if
there is a different migration pattern between the designs.
2. To assess and compare the in vivo kinematic patterns of the knee designs by means of
fluoroscopy. This will be done on a subset of the patients (the first 20 patients able
to perform step-up and lunge motions 6 months post-operatively in a controlled manner
without the use of bars and walk more than 1 km)
3. To evaluate if the polyethylene bearing in the mobile bearing is rotating and if this
changes over time.
4. Results of the RSA study will be used to correlate the kinematic parameters
(fluoroscopy) with the migration results in order to identify factors of risk for the
survival of total knee prostheses.
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