全髋关节置换术后髋臼假体外倾角的临床研究

Abstract

Abstract:

Objective　To assess cup inclination of THAs by measuring the abduction angle and to find out if the abduction angle relate to polyethylene wear or not.　Methods　Cup abduction angle and polyethylene wear were measured on the X-ray with a series of 145 hips undergone THA before 2011 May. The rates of abduction angle greater than 50 degree and 55 degree were calculated. The relationship between cup abduction angle and polyethylene linear wear was evaluated.　Results　It happened in 32（22.1%, 95% CI: 15.3%~28.9%） hips that abduction angle exceeded 55 degree and 61（42.1%, 95%CI: 34.1%~50.1%） hips'abduction angle greater than 50 degree. Abduction angle that greater than 50 degree significantly caused polyethylene liner wear. In 107 unilateral THA, positive correlation between abduction angle and liner wear was revealed by a scatter diagram and then a curve estimation was taken. R square was up to 0.697 using Quadratic curve. Regression equation was ■=4.431-0.21x+0.003x2.　Conclusions　Incorrect abduction angle may cause polyethylene wear in THA. Measurement should be made to place the cup at appropriate position.

Key words: Arthroplasty,replacement, hip, Abduction, Polyethylene, Liner

CLC Number:

R687.4

LEI Wei-Jie, JIN Da-De, LI Zhi-Chen, CHEN Dong-Feng, TU Nan-Sheng. Clinical study of cup abduction angle after total hip arthroplasty[J]. Chinese Journal Of Clinical Anatomy, 2012, 30(2): 233-236.

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Clinical study of cup abduction angle after total hip arthroplasty

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