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Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_9 | Pages 20 - 20
1 May 2016
Marega L Gregor V
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Introduction

Although total knee arthroplasty (TKA) has become a successful routine procedure in clinical orthopaedics, up to 20% of patients are not satisfied with the outcome of their surgery. Dissatisfaction in high-demand patients has been associated with the functional limitations of conventional TKA implants, as they do not recreate the natural biomechanics of the knee.

A novel knee prosthesis has been designed to replicate the natural rolling & gliding mechanism of the knee joint, aiming to restore a physiological movement whilst improving implant stability and pain-free function.

This TKR system includes 3 versions (CR, PS, KR); the KR (Kinematic Retaining) preserves the posterior cruciate ligament (PCL); the femoral component incorporates a thin anterior flange and a deep, broad trochlear groove to reduce anterior knee pain and to reproduce physiological patellar tracking without constraining the patella. The sagittal plane multiple radii of the femoral condyles (J-curve) allows the carefully designed femur to physiologically tension the collateral ligaments during the entire flexion/extension cycle. Tibial liners are also asymmetrical, presenting a concave medial shape with a saddle-like lateral shape. These asymmetric articulating surfaces have been designed to reproduce a more natural physiological roll-back and rotation of the femur over the tibia, thus reducing the sliding friction in the early phases of knee flexion. Furthermore, the roll-back motion relieves the stress from the patella and restores the physiological function of the quadriceps.

Objectives

Aim of this retrospective study was to assess the first clinical and radiographic outcomes after TKA with the Physica Kinematic Retaining (KR) knee system.