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Knee laxity after unicompartmental joint replacement: A planar mathematical analysis
Published in Institute of Electrical and Electronics Engineers (IEEE)
2011
Pages: 424 - 427
Abstract
Passive knee laxity is an important clinical measure to assess function after joint replacement. Clinical observations suggest that the use of minimally invasive surgical techniques in knee arthroplasty may affect the surgeon's ability to orient and position the prosthetic components accurately. Further, recent studies suggest that malplaced prosthetic components in unicompartmental knee replacement (UKR) can affect the ligament forces and, hence, the knee laxity. In the present study, a sagittal plane mathematical model of the knee with unicompartmental replacement is used to analyze the passive antero-posterior (A-P) laxity during flexion using different force levels. Also, the effects of errors in component position are evaluated. The results show that for all force levels, the A-P laxity first increases from 0 to about 30 flexion, remains nearly constant for another 10 and then decreases somewhat linearly for higher flexion angles. Changes in the position of the femoral component by 1mm can affect the knee laxity by 2mm or more in some flexion positions. The analysis has clinical relevance and suggests that the UKR requires close attention to component placement. © 2011 IEEE.
About the journal
JournalData powered by Typeset2011 1st Middle East Conference on Biomedical Engineering, MECBME 2011
PublisherData powered by TypesetInstitute of Electrical and Electronics Engineers (IEEE)
Open AccessNo
Concepts (7)
  •  related image
    Knee
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    Ligaments
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    Joints
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    Prosthetics
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    Force
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    Mathematical model
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    Surgery