Measurement of the Acetabular Cup Anteversion on Simulated Radiographs

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

doi:10.1016/j.arth.2007.10.029

Measurement of the Acetabular Cup Anteversion on Simulated Radiographs

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

Research output: Contribution to journal › Article › peer-review

41 Citations (Scopus)

Abstract

Widmer (J Arthroplasty 2004;19:387) reported a protractor for measuring the anteversion of acetabular cups on radiographs but with limited precision. We intended to improve its precision by trigonometric mathematics. We measured the anteversion of the acetabular cups on 336 simulated radiographs using aforementioned 2 methods. The anteversion measured by Widmer's protractor ranged from 7° to 41° (mean ± SD = 28.0° ± 9.8°), and our methods, 5° to 51° (27.7° ± 13.2°). The mean ± SD of error by Widmer's protractor was 5.2 ± 2.5°, and our protractor, 0.8° ± 0.8° (Student t test, P < .0001). The interobserver study showed the difference between measurements less than 2° for each method. Therefore, the smaller error of our method than that of Widmer implicated a potentially precise measurement of the anteversion (level of evidence: diagnostic study, level II).

Original language	English
Pages (from-to)	468-474
Number of pages	7
Journal	Journal of Arthroplasty
Volume	24
Issue number	3
DOIs	https://doi.org/10.1016/j.arth.2007.10.029
Publication status	Published - Apr 1 2009
Externally published	Yes

Keywords

acetabulum
anteversion
hip arthroplasty
protractor

ASJC Scopus subject areas

Orthopedics and Sports Medicine

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10.1016/j.arth.2007.10.029

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title = "Measurement of the Acetabular Cup Anteversion on Simulated Radiographs",

abstract = "Widmer (J Arthroplasty 2004;19:387) reported a protractor for measuring the anteversion of acetabular cups on radiographs but with limited precision. We intended to improve its precision by trigonometric mathematics. We measured the anteversion of the acetabular cups on 336 simulated radiographs using aforementioned 2 methods. The anteversion measured by Widmer's protractor ranged from 7° to 41° (mean ± SD = 28.0° ± 9.8°), and our methods, 5° to 51° (27.7° ± 13.2°). The mean ± SD of error by Widmer's protractor was 5.2 ± 2.5°, and our protractor, 0.8° ± 0.8° (Student t test, P < .0001). The interobserver study showed the difference between measurements less than 2° for each method. Therefore, the smaller error of our method than that of Widmer implicated a potentially precise measurement of the anteversion (level of evidence: diagnostic study, level II).",

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AU - Wu, Tai Yin

AU - Fuh, Chiou Shann

PY - 2009/4/1

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AB - Widmer (J Arthroplasty 2004;19:387) reported a protractor for measuring the anteversion of acetabular cups on radiographs but with limited precision. We intended to improve its precision by trigonometric mathematics. We measured the anteversion of the acetabular cups on 336 simulated radiographs using aforementioned 2 methods. The anteversion measured by Widmer's protractor ranged from 7° to 41° (mean ± SD = 28.0° ± 9.8°), and our methods, 5° to 51° (27.7° ± 13.2°). The mean ± SD of error by Widmer's protractor was 5.2 ± 2.5°, and our protractor, 0.8° ± 0.8° (Student t test, P < .0001). The interobserver study showed the difference between measurements less than 2° for each method. Therefore, the smaller error of our method than that of Widmer implicated a potentially precise measurement of the anteversion (level of evidence: diagnostic study, level II).

KW - acetabulum

KW - anteversion

KW - hip arthroplasty

KW - protractor

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Measurement of the Acetabular Cup Anteversion on Simulated Radiographs

Abstract

Keywords

ASJC Scopus subject areas

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