https://scholars.lib.ntu.edu.tw/handle/123456789/158095
標題: | INFLUENCE OF POST-CAM DESIGN ON STRESSES ON POSTERIOR- STABILIZED TIBIAL POSTS | 作者: | HUANG, CHANG-HUNG LIAU, JIANN-JONG HUANG, CHUN-HSIUNG CHENG, CHENG-KUNG |
公開日期: | 2006 | 卷: | v.450 | 起(迄)頁: | 150-156 | 來源出版物: | CLINICAL ORTHOPAEDICS AND RELATED RESEARCH | 摘要: | Polyethylene wear and fracture at the tibial post of posterior- stabilized knee prostheses are common complications. Analyzing the stresses on various designs of tibial posts should predict the risk of damage. The post-cam of knee prostheses generally are designed either as flat-on -flat or curve-on- curve contact surfaces. We investigated stress on such tibial posts using a finite element method. We applied a 500-N anteroposterior shear force to the knee at neutral contact and 10° tibial internal rotation when the knee was flexed at 60°, 90°, 120°, and 150°. There was more stress during tibial rotation compared with during neutral contact. The greatest increments of maximum von Mises stress and contact stress in the flat-on-flat model were from 20.4 to 46.1 MPa (126.3%) and from 22.2 to 55.7 MPa (151%), respectively, whereas in the curve-on-curve design they were from 20.5 to 22.7 MPa (10.7%) and from 33.0 to 35.4 MPa (7.2%), respectively. Increased stress concentration at the tibial post occurred at increased flexion angles along with axial tibial rotation. The curve- on-curve design reduced stress concentration when the knee sustained an anteroposterior shear force with tibial rotation. |
描述: | SCI |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/64235 |
顯示於: | 物理治療學系所 |
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