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How useful is templating for total knee replacement component sizing?

A C Peek1, B Bloch, J Auld

  • 1Northampton General Hospital, UK. annapeek@doctors.org.uk

The Knee
|May 13, 2011
PubMed
Summary
This summary is machine-generated.

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Digital templating for total knee replacement improves accuracy by ensuring component sizes are closer to the ideal fit. This preoperative planning tool helps surgeons achieve better radiographic outcomes and patient satisfaction.

Area of Science:

  • Orthopaedic surgery
  • Medical imaging analysis
  • Surgical planning technology

Background:

  • Accurate component sizing is crucial for successful total knee arthroplasty (TKA).
  • Previous studies have assessed templating accuracy, but few have correlated preoperative digital templating with postoperative radiographic outcomes.
  • Evaluating the discrepancy between templated and implanted sizes is essential for refining surgical techniques.

Purpose of the Study:

  • To evaluate the accuracy of digital templating in TKA at our institution.
  • To compare templated component sizes with actual implanted sizes.
  • To determine the impact of preoperative digital templating on radiographic outcomes and identify preferable templated sizes in cases of mismatch.

Main Methods:

  • Analysis of 90 sequential PFC Sigma total knee replacements.

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  • Digital templating applied to 45 cases using a calibrating ball and Agfa Orthopaedic Tools software.
  • Independent grading of postoperative radiographs for correct component sizing.

    • Main Results:

    • All digital templates were within one size of the implanted prosthesis.
    • Femoral components were more frequently oversized in the non-templated group.
    • Tibial trays found to be too small were often templated larger, and those templated too large were often templated smaller, indicating a trend towards improved accuracy with templating.

    Conclusions:

    • Digital templating, when used with a calibrating device, is a valuable tool in preoperative planning for total knee arthroplasty.
    • Templating demonstrates a positive impact on achieving accurate component sizing, potentially reducing errors like oversizing.
    • Further refinement of digital templating may lead to even greater precision in TKA component selection.