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Related Experiment Video

Updated: May 27, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

Adjustable cutting blocks improve alignment and surgical time in computer-assisted total knee replacement.

Eduardo M Suero1, Christopher Plaskos, Peter L Dixon

  • 1Department of Orthopaedic Surgery, Hospital for Special Surgery, 535 E 70th St., New York, NY 10021, USA. SueroE@hss.edu

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|November 26, 2011
PubMed
Summary

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Adjustable cutting blocks (ACB) in computer-navigated total knee arthroplasty (TKA) significantly improve mechanical leg alignment and reduce surgical time compared to conventional cutting blocks (CCB). This study confirms ACB

Area of Science:

  • Orthopedic surgery
  • Surgical navigation technology
  • Biomechanical analysis

Background:

  • Computer navigation in total knee arthroplasty (TKA) enhances accuracy but can increase operative time.
  • Previous cadaver studies suggested adjustable cutting blocks (ACB) improve precision and reduce procedure length in navigated TKA.
  • Conventional cutting blocks (CCB) are standard in navigated TKA, with potential for longer surgical durations.

Purpose of the Study:

  • To evaluate the in vivo efficacy of adjustable cutting blocks (ACB) in computer-navigated total knee arthroplasty (TKA).
  • To compare component alignment and mechanical leg alignment between ACB and conventional cutting blocks (CCB) in TKA.
  • To assess the impact of ACB on surgical time during navigated TKA.

Main Methods:

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Last Updated: May 27, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

  • A radiographic comparison of component and mechanical leg alignment was performed.
  • Tourniquet time was recorded for all patients.
  • Ninety-four patients undergoing TKA were analyzed, with 30 using ACB and 64 using CCB.

    • Main Results:

    • Mechanical alignment variability was significantly lower in the ACB group (SD = 1.7°) versus the CCB group (SD = 2.7°).
    • Tourniquet time was reduced by an average of 14.8 minutes in the ACB group compared to the CCB group.
    • No significant differences in component alignment were observed between the two groups.

    Conclusions:

    • Adjustable cutting blocks (ACB) significantly decrease postoperative mechanical alignment variability in TKA compared to conventional navigated instrumentation.
    • ACB use in TKA leads to a significant reduction in tourniquet time.
    • ACB provide comparable or superior component alignment while improving efficiency in navigated TKA.