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Related Experiment Video

Updated: Dec 26, 2025

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Factors Influencing Graft Function following MPFL Reconstruction: A Dynamic Simulation Study.

Miho J Tanaka1, Andrew J Cosgarea2, Jared M Forman2

  • 1Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts.

The Journal of Knee Surgery
|March 7, 2020
PubMed
Summary

Medial patellofemoral ligament (MPFL) reconstruction improves patellar tracking by reducing lateral shift. Graft tension is influenced by tibial tuberosity position and peaks at low knee flexion angles.

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Area of Science:

  • Orthopedic Surgery
  • Biomechanics
  • Sports Medicine

Background:

  • Recurrent lateral patellar instability is commonly treated with medial patellofemoral ligament (MPFL) reconstruction.
  • Previous studies on graft function often used normal knee models, limiting understanding in patients with pathologic anatomy.

Purpose of the Study:

  • To analyze medial patellofemoral ligament (MPFL) graft function after reconstruction.
  • To investigate the impact of patient-specific anatomy on graft tension and patellar tracking during knee flexion.

Main Methods:

  • Utilized 15 multibody dynamic simulation models of knees with recurrent lateral patellar instability.
  • Simulated knee squatting pre- and post-MPFL reconstruction using hamstring tendon grafts.
  • Analyzed graft tension and patellar tracking (bisect offset index) at 5-degree increments of knee flexion.

Main Results:

  • Maximum graft tension significantly correlated with lateral tibial tuberosity position (r²=0.73, p<0.001).
  • Graft tension peaked at low flexion angles, diminishing by 30 degrees.
  • MPFL reconstruction reduced lateral patellar shift across most flexion angles (0-50 degrees), except 45 degrees.

Conclusions:

  • Tibial tuberosity position is a key factor influencing MPFL graft tension.
  • MPFL reconstruction effectively decreases lateral patellar maltracking, particularly at lower flexion angles.
  • Understanding anatomical influences is crucial for optimizing MPFL graft function and preventing complications.