A simple mathematical standardized measurement of acetabulum anteversion after total hip arthroplasty

Chen Kun Liaw, Rong Sen Yang, Sheng Mou Hou, Tai Yin Wu, Chiou Shann Fuh

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We invented a standardization method to measure the cup's anteversion after total hip arthroplasty without the influence of patient's position. We measured 68 radiographs of 10 patients after total hip replacement (THR) and calculated the error of each measurement, defined as the difference with the average of the same measuring method on the same patient. We also calculated the repeatability standard deviation (RSD) of each method according to the American Society for Testing and Materials, ASTM E691. Mean absolute inter-examination angle error, defined as the average of the absolute deviations, was 0.75° for standardized anteversion (range 0.03-2.51°), as compared with those without standardization, 2.30° (range 0.04-13.04°). The inter-examination measurement reliability (precision), defined as one RSD, was 0.99° for standardized anteversion, as compared with those without standarization, 3.50°. There is no difference between patients four and five without (p = 0.097). There is a significant difference with standardization (p < 0.0001). Our study demonstrated that this mathematical method is a precise tool to measure the anteversion of the acetabular cup. We hope that it can be used widely in the future.

Original languageEnglish
Pages (from-to)105-119
Number of pages15
JournalComputational and Mathematical Methods in Medicine
Volume9
Issue number2
DOIs
Publication statusPublished - Jun 1 2008
Externally publishedYes

Fingerprint

Arthroplasty
Acetabulum
Standardization
Hip
Repeatability
Standard deviation
Materials Testing
Hip Replacement Arthroplasties
Range of data
Replacement
Deviation
Testing
Angle

Keywords

  • Acetabulum
  • Anteversion
  • Radiographs
  • Standardized

ASJC Scopus subject areas

  • Modelling and Simulation
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Applied Mathematics

Cite this

A simple mathematical standardized measurement of acetabulum anteversion after total hip arthroplasty. / Liaw, Chen Kun; Yang, Rong Sen; Hou, Sheng Mou; Wu, Tai Yin; Fuh, Chiou Shann.

In: Computational and Mathematical Methods in Medicine, Vol. 9, No. 2, 01.06.2008, p. 105-119.

Research output: Contribution to journalArticle

Liaw, Chen Kun ; Yang, Rong Sen ; Hou, Sheng Mou ; Wu, Tai Yin ; Fuh, Chiou Shann. / A simple mathematical standardized measurement of acetabulum anteversion after total hip arthroplasty. In: Computational and Mathematical Methods in Medicine. 2008 ; Vol. 9, No. 2. pp. 105-119.
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