IN VIVO KNEE KINEMATICS AND JOINT CENTRE OF ROTATION IN TOTAL KNEE ARTHROPLASTY GAIT QUANTIFIED BY MOBILE BIPLANE X-RAY IMAGING
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INTRODUCTION Accurate knowledge of knee joint kinematics following total knee arthroplasty (TKA) is critical for evaluating the functional performance of specific implant designs. Biplane fluorosco...Keywords:
Biplane
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Total Knee Arthroplasty (TKA) using standard artificial knee implant has a limitation in restriction in the range of motion and freedom of movements'. This study was worked out to compare the kinematics of a reconstructed 3D knee with standard and high flexion artificial knee designs. A CT bone model reconstructed with MIMICS for a 3D normal knee joint and the simulation was done for normal knee, standard version of artificial knee as well as the high flexion knee designs. The results of the analyses, provides us an insight that high flexion designs were most suited and gives increased range of motion and also provides an additional degree of freedom so that it almost mimics the normal knee movement. The high flexion design when tested under simulated environment provided a better functionality and increased movements. It was concluded that the normal knee has 6 degrees of freedom (DOF); the standard version has 1 rotation and 1 translation. The high flexion design provides 2 rotations and 1 translation.
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Functional outcome after total knee arthroplasty is determined by strength, stability and range of motion. Flexion in the replaced knee is suboptimal for many patients and kinematics after total knee arthroplasty is abnormal. The relation between kinematics of the replaced knee and postoperative exion is analysed and compared to normal knee kinematics. Specic characteristics that relate to better exion are dened: posterior condylar offset, femoral rollback and external femoral rotation during exion relate to a better post-operative range of motion. A rationale for a guided motion knee arthroplasty is developed and positioned within the current state of the art knowledge on total knee arthroplasty.
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Understanding the long-term effects of total knee arthroplasty (TKA) on joint kinematics is vital to assess the success of the implant design and surgical procedure. However, while in vitro cadaver...
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