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Related Experiment Videos

Flexion space configuration in total knee arthroplasty

R S Laskin1

  • 1Hospital for Special Surgery, New York, New York 10021, USA.

The Journal of Arthroplasty
|October 1, 1995
PubMed
Summary

Rectangularizing the knee flexion space by externally rotating femoral components improved range of motion and reduced pain and radiolucencies. This surgical technique enhances outcomes in total knee arthroplasty.

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Total knee arthroplasty

Background:

  • Standard knee arthroplasty involves resecting femoral condyles and tibia.
  • This often creates a trapezoidal flexion space, potentially limiting motion and causing complications.
  • Optimizing the joint space geometry is crucial for functional outcomes.

Purpose of the Study:

  • To evaluate the impact of rectangularizing the knee flexion space on range of motion and postoperative complications.
  • To determine the optimal degree of external rotation for femoral components.

Main Methods:

  • Two groups of patients undergoing total knee arthroplasty were studied.
  • Group 1: Trapezoidal flexion space maintained.
  • Group 2: Femoral components externally rotated to achieve a rectangular flexion space.

Main Results:

  • The group with a rectangularized flexion space demonstrated an increased range of flexion.
  • This group also showed a decreased incidence of medial tibial pain.
  • Furthermore, a reduction in Zone I radiolucencies was observed in the rectangularized group.
  • The mean external rotation required was 3 degrees, except in cases of pre-operative hypervalgus knees.

Conclusions:

  • External rotation of femoral components to rectangularize the knee flexion space improves range of motion post-total knee arthroplasty.
  • This technique effectively reduces medial tibial pain and Zone I radiolucencies.
  • A mean of 3 degrees external rotation is generally sufficient for achieving these benefits.

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