The Middle and Distal Aspects of the Ulnar Footprint of the Medial Ulnar Collateral Ligament of the Elbow Do Not Provide Significant Resistance to Valgus Stress: A Biomechanical Study

Orthopaedic Journal of Sports Medicine
Brandon J EricksonJoshua S Dines

Abstract

The medial ulnar collateral ligament (UCL) insertion of the elbow has been shown to extend distally beyond the sublime tubercle. The contribution to valgus stability of the distal aspect of the footprint is unknown. The purpose of this study was to determine the contribution of each part of the UCL footprint to the elbow valgus stability provided by the UCL. It was hypothesized that the distal two-thirds of the ulnar UCL footprint would not contribute significantly to valgus stability provided by the UCL. Descriptive laboratory study. Fifteen cadaveric arms were dissected to the capsuloligamentous elbow structures and potted. A servohydraulic load frame was used to place 5 N·m of valgus stress on the intact elbow at 30°, 60°, 90°, and 120° of flexion. The UCL insertional footprint was measured and divided into thirds (proximal, middle, and distal). One-third of the UCL footprint was elevated off the bone (leaving the ligament in continuity), and the elbow was retested at the same degrees of flexion. This was repeated until the entire UCL footprint on the ulna was sectioned. Each elbow was randomized for how the UCL would be sectioned (sectioning the proximal, then middle, and then distal third or sectioning the distal, then mid...Continue Reading

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Apr 11, 2018·Orthopaedic Journal of Sports Medicine·Christopher L CampJoshua S Dines

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Citations

Oct 28, 2019·The American Journal of Sports Medicine·Pascual H DuttonMelodie F Metzger
Jan 29, 2020·Current Reviews in Musculoskeletal Medicine·Mark E CinqueSalvatore Frangiamore
Apr 24, 2020·Current Reviews in Musculoskeletal Medicine·Cort D LawtonJoshua S Dines

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Methods Mentioned

BETA
dissection
dissecting

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