斜格
垂直的
医学
口腔正畸科
流离失所(心理学)
固定(群体遗传学)
弯曲
断裂(地质)
材料科学
复合材料
几何学
人口
哲学
环境卫生
语言学
数学
心理治疗师
心理学
作者
Patrick Atkinson,Paul M. Charpentier,Brian P. Flanagan,Ajay Kumar Srivastava
出处
期刊:PubMed
日期:2015-01-01
卷期号:24 (2): 130-6
被引量:1
摘要
Fracture stability can be challenging for osteoporotic individuals. The end screw of nonlocked plates is subjected to the greatest loading and is typically the site of construct failure. To enhance fixation, the end screw can be angled away from the fracture. The current study biomechanically evaluated screws angled the other direction: toward the fracture using 3.5-mm dynamic compression plates in an osteoporotic bone model. Three different plate lengths (6-, 8-, 12-hole) were tested in three-point bending with an oblique, perpendicular, or reverse oblique end screw. The peak load for loss of screw fixation for the reverse oblique end screw constructs was significantly less than the other screw orientations for all plate lengths. The 12-hole peak load, energy, and displacement magnitudes for all three screw orientations were significantly greater than all 6- and 8-hole constructs. The use of a reverse oblique end screw is inferior to both perpendicular and oblique end screws.
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