Tibiofemoral contact mechanics after serial medial meniscectomies in the human cadaveric knee

The American Journal of Sports Medicine
Stephen J LeeBrian J Cole

Abstract

There is no consensus regarding the extent of meniscectomy leading to deleterious effects on tibiofemoral contact mechanics. The meniscus aids in optimizing tibiofemoral contact mechanics, increasing contact area, and decreasing contact stress. Controlled laboratory study. Twelve fresh-frozen human cadaveric knees each underwent 15 separate testing conditions-5 serial 20-mm posterior medial meniscectomy conditions (intact, 50% radial width, 75% radial width, segmental, and total meniscectomy) at 3 flexion angles (0 degrees , 30 degrees , and 60 degrees )-under an 1800-N axial load. Tekscan sensors were used to measure total force and medial force, contact area, mean contact stress, and peak contact stress. All posterior medial meniscectomy conditions resulted in significantly decreased contact areas and increased mean and peak contact stresses compared with the intact state (P < .05). The changes in contact mechanics after segmental and total posterior medial meniscectomies were not statistically different (P > .05). Incremental changes in contact area and mean contact stress increased as more peripheral portions of the medial meniscus were removed, whereas peak contact stresses exhibited similar incremental changes throughout ...Continue Reading

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