Resection of Grade III Cranial Horn Tears of the Equine Medial Meniscus Alter the Contact Forces on Medial Tibial Condyle at Full Extension: An In-vitro Cadaveric Study

Authors

  • Jennifer Fowlie DVM, MSc,

    Corresponding author
    • Department of Large Animal Clinical Studies, College of Veterinary Medicine, Michigan State University, East Lansing, MI
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  • Steven Arnoczky DVM, Diplomate ACVS & ACVSMR,

    1. Laboratory for Comparative Orthopaedic Research, College of Veterinary Medicine, Michigan State University, East Lansing, MI
    2. Department of Small Animal Clinical Studies, College of Veterinary Medicine, Michigan State University, East Lansing, MI
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  • Michael Lavagnino PhD,

    1. Laboratory for Comparative Orthopaedic Research, College of Veterinary Medicine, Michigan State University, East Lansing, MI
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  • Tristan Maerz B Eng,

    1. Department of Orthopaedic Research, William Beaumont Hospital Research Institute, Royal Oak, MI
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  • John Stick DVM, Diplomate ACVS

    1. Department of Large Animal Clinical Studies, College of Veterinary Medicine, Michigan State University, East Lansing, MI
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  • Work completed in The Laboratory for Comparative Orthopaedic Research at Michigan State University. Equipment and expertise from the Department of Orthopaedic Research at William Beaumont Hospital were also used.

    Funding: Freeman Funds Grant, Michigan State University.

    Presented in part at the 2011 ACVS Symposium, Chicago, IL.

Corresponding Author

Jennifer Fowlie, DVM, D-202 Department of Large Animal Clinical Studies, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824-1314

E-mail: jenniferfowlie@gmail.com

Abstract

Objective

To evaluate the magnitude and distribution of joint contact pressure on the medial tibial condyle after grade III cranial horn tears of the medial meniscus.

Study Design

Experimental study.

Animals

Cadaveric equine stifles (n = 6).

Methods

Cadaveric stifles were mounted in a materials testing system and electronic pressure sensors were placed between the medial tibial condyle and medial meniscus. Specimens were loaded parallel to the longitudinal axis of the tibia to 1800 N at 130°, 140°, 150°, and 160° stifle angle. Peak pressure and contact area were recorded from the contact maps. Testing was repeated after surgical creation of a grade III cranial horn tear of the medial meniscus, and after resection of the simulated tear.

Results

In the intact specimens, a significantly smaller contact area was observed at 160° compared with the other angles (P < .05). Creation of a grade III cranial horn tear in the medial meniscus did not significantly alter the pressure or contact area measurements at any stifle angle compared with intact specimens (P > .05). Resection of the tear resulted in significantly higher peak pressures in the central region of the medial tibial condyle at a stifle angle of 160° relative to the intact (P = .026) and torn (P = .012) specimens.

Conclusions

Resection of grade III cranial horn tears in the medial meniscus resulted in a central focal region of increased pressure on the medial tibial condyle at 160° stifle angle.

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