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Difference between Mechanical Alignment in Navigation and Scanogram during Total Knee Arthroplasty.

Rohan Bhimani1, Fardeen Bhimani2, Preeti Singh3

  • 1Department of Orthopaedics, Hinduja Healthcare Surgical, 11 Road, Khar West, Mumbai 400052, India.

Advances in Orthopedics
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PubMed
Summary
This summary is machine-generated.

Postoperative knee alignment measurements differ between computer navigation and scanograms. Computer navigation shows lower alignment values, indicating potential discrepancies in assessing total knee arthroplasty outcomes.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Radiology

Background:

  • Implant malpositioning in total knee arthroplasty (TKA) can lead to polyethylene wear and loosening.
  • Limb alignment is crucial for TKA success, with scanograms traditionally used for measurement.
  • Computer navigation offers real-time intraoperative measurements, potentially improving accuracy.

Purpose of the Study:

  • To investigate the association between pre- and postoperative coronal alignments measured by scanogram and computer navigation in TKA.
  • To compare the accuracy of scanogram versus computer navigation in assessing limb alignment after TKA.

Main Methods:

  • Prospective data collection from 200 patients undergoing primary TKA with computer navigation.
  • Comparison of pre- and postoperative scanogram findings with intraoperative computer navigation measurements.
  • Analysis of coronal alignments, including the Hip-Knee Ankle Axis (HKA).

Main Results:

  • Preoperatively, no significant difference was found between mechanical axis measurements on navigation (10.65°) and scanogram (10.38°).
  • Postoperatively, navigation showed a mean mechanical axis of 0.69°, while scanogram showed 2.73°.
  • A significant difference (p < 0.0001) and no correlation were observed between postoperative HKA and intraoperative mechanical axis.

Conclusions:

  • Postoperative mechanical alignment values in TKA are lower when measured by computer navigation compared to standing full-length hip-to-ankle scanograms.
  • Discrepancies in postoperative alignment measurements highlight the need for careful interpretation of both methods.
  • Further research may be warranted to refine alignment assessment techniques in TKA.