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Differences in component and limb alignment between computer-assisted and conventional surgery total knee

Tsan-Wen Huang1, Kuo-Ti Peng, Kuo-Chin Huang

  • 1Division of Joint Reconstruction, Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, Chiayi, No. 6, West Section, Chia-Pu Road, Putz, 613, Chia-Yi, Taiwan.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|October 22, 2014
PubMed
Summary

Computer-assisted surgery for total knee arthroplasty (CAS-TKA) improved femoral component alignment in knees with significant coronal bowing. While functional scores showed no short-term difference, CAS-TKA offers better mechanical axis reconstruction.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Radiology

Background:

  • Marked coronal femoral bowing presents challenges for achieving optimal alignment in total knee arthroplasty (TKA) using conventional instrumentation.
  • Mal-alignment of the femoral component and reconstructed mechanical axis (MA) can lead to suboptimal outcomes.

Purpose of the Study:

  • To evaluate the efficacy of computer-assisted surgery-total knee arthroplasty (CAS-TKA) in patients with marked coronal femoral bowing.
  • To compare CAS-TKA with conventional techniques for achieving accurate femoral component and mechanical axis alignment.

Main Methods:

  • Retrospective comparative study involving 65 patients with osteoarthritic knees and marked coronal femoral bowing undergoing TKA.
  • Comparison of CAS-TKA (n=28) and conventional techniques (n=37) based on radiographic parameters (coronal, sagittal, axial planes) and CT scans for rotational alignment.
  • Functional outcomes assessed using Hospital for Special Surgery (HSS) and International Knee Society (IKS) scores.

Main Results:

  • CAS-TKA demonstrated greater consistency in achieving proper postoperative MA and ideal femoral component alignment in coronal and sagittal planes compared to conventional methods.
  • No significant difference was observed in the axial plane alignment of the femoral component between CAS-TKA and conventional TKA.
  • At a mean follow-up of 43 months, no significant difference in HSS and IKS scores was found between the two groups.

Conclusions:

  • CAS-TKA effectively achieves proper coronal and sagittal alignment of the femoral component and postoperative MA in patients with marked coronal femoral bowing.
  • While short-term functional outcomes were similar, CAS-TKA shows potential benefits for alignment accuracy in challenging cases.
  • Long-term follow-up is necessary to determine the ultimate clinical benefits of CAS-TKA in this patient population.