期刊
JOURNAL OF SHOULDER AND ELBOW SURGERY
卷 26, 期 9, 页码 1636-1643出版社
MOSBY-ELSEVIER
DOI: 10.1016/j.jse.2017.04.011
关键词
Posteromedial rotatory instability; anteromedial coronoid fracture; lateral collateral ligament; posterior bundle of the medial collateral ligament; elbow subluxation; joint incongruity; articular contact pressure
资金
- Mayo Foundation
Background: Posteromedial rotatory instability (PMRI) of the elbow consists of an anteromedial coronoid fracture with lateral collateral ligament (LCL) and posterior bundle of the medial collateral ligament (PMCL) tears. We hypothesized that the LCL tear is required for elbow subluxation/joint incongruity and that an elbow affected by an anteromedial subtype 2 coronoid fracture and a PMCL tear exhibits contact pressures different from both an intact elbow and an elbow affected by PMRI. Materials and methods: Six cadaveric elbows were tested under gravity varus stress using a custom-made machine designed to simulate muscle loads and to passively flex the elbow from 0 degrees to 90 degrees and measure joint contact pressures. After testing of the intact specimen (INTACT-elbow), an anteromedial subtype 2 coronoid fracture with a PMCLtear (COR+ PMCL-elbow) and a PMRI injury (PMRI-elbow), after adding an LCLtear, were tested. The highest values of mean contact pressure were used for the comparison among the 3 groups. Results: Neither subluxation nor joint incongruity was observed in the COR+ PMCL-elbow. The addition of an LCL detachment consistently caused subluxation and joint incongruity. Mean contact pressures were higher in the COR+ PMCL-elbow compared with the INTACT-elbow (P < .03) but lower than in the PMRI-elbow (P < .001). Conclusions: The LCL lesion in PMRI is necessary for elbow subluxation and causes marked elevations in contact pressures. Even without subluxation, the COR+ PMCL-elbow showed higher contact pressures compared with the INTACT-elbow. Treatment of PMRI should be directed toward prevention of joint incongruity, whether by surgical or nonsurgical means, to prevent high articular contact pressures. (C) 2017 Journal of Shoulder and Elbow Surgery Board of Trustees. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据