Biomechanical Effects of a Horizontal Medial Meniscal Tear and Subsequent Leaflet Resection

The American Journal of Sports Medicine
Matthew J BrownJohn M Marzo

Abstract

Horizontal, degenerative tears of the medial meniscus and subsequent meniscectomy can compromise the biomechanical function of the meniscus in load transmission and weightbearing, leading to the development of radiographic and symptomatic tibiofemoral arthritis. Resection of both leaflets of a horizontal medial meniscal tear will increase peak contact pressures and decrease contact areas in comparison with resection of only the inferior leaflet. Controlled laboratory study. Twelve fresh-frozen human cadaveric knees had tibiofemoral peak contact pressures and contact areas under an 1800-N axial load measured by Tekscan in the control state. A horizontal tear was created in the posterior horn of the medial meniscus, and the knees were retested. The knees were tested a third time after resection of the inferior leaflet (single leaflet) and a final time after resection of the superior leaflet (both leaflets). The Friedman test was used to test for group differences in peak pressure (psi) and contact area (mm(2)) between test conditions (native, tear, inferior leaflet resection, and resection of both leaflets). For the medial compartment, there was a statistically significant difference in peak pressure (P = .03) but not in contact ...Continue Reading

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