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Gap Balancing versus Measured Resection Technique for Total Knee Arthroplasty

  • Douglas A. DennisEmail author
  • Richard D. Komistek
  • Raymond H. Kim
  • Adrija Sharma
Symposium: Papers Presented at the Annual Meetings of the Knee Society

Abstract

Multiple differing surgical techniques are currently utilized to perform total knee arthroplasty (TKA). We compared knee arthroplasties performed using either a measured resection or gap balancing technique to determine if either operative technique provides superior coronal plane stability as measured by assessment of the incidence and magnitude of femoral condylar lift-off. We performed 40 TKA using a measured resection technique (20 PCL-retaining and 20 PCL-substituting) and 20 PCL-substituting TKA were implanted using gap balancing. All subjects were analyzed fluoroscopically while performing a deep knee bend. The incidence of coronal instability (femoral condylar lift-off) was then determined using a 3-D model fitting technique. The incidence of lift-off greater than 0.75 mm was 80% (maximum, 2.9 mm) and 70% (maximum, 2.5 mm) for the PCL-retaining and substituting TKA groups performed using measured resection versus 35% (maximum, 0.88 mm) for the gap-balanced group. Lift-off greater than 1 mm occurred in 60% and 45% of the PCL-retaining and -substituting TKA using measured resection versus none in the gap-balanced group. Rotation of the femoral component using a gap balancing technique resulted in better coronal stability which we suggest will improve functional performance and reduce polyethylene wear.

Keywords

Total Knee Arthroplasty Femoral Component Bony Landmark Transepicondylar Axis Posterior Condylar Axis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We thank Kendall Slutzky for her assistance in manuscript preparation and numerous engineering students at the Center for Musculoskeletal Research (University of Tennessee) for their assistance in patient fluoroscopy testing and three dimensional kinematic analysis.

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Copyright information

© The Association of Bone and Joint Surgeons® 2009

Authors and Affiliations

  • Douglas A. Dennis
    • 1
    • 2
    • 3
    • 4
    Email author
  • Richard D. Komistek
    • 1
  • Raymond H. Kim
    • 3
  • Adrija Sharma
    • 1
  1. 1.Center for Musculoskeletal ResearchUniversity of TennesseeKnoxvilleUSA
  2. 2.University of Colorado Health Sciences CenterDenverUSA
  3. 3.Rocky Mountain Musculoskeletal Research LaboratoryDenverUSA
  4. 4.Colorado Joint ReplacementDenverUSA

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