Various methods have been described for measuring acetabular component anteversion. However, accurate measurement of anteversion is difficult. We herein propose a new method using cross-table lateral (CL) radiography performed with the contralateral hip flexed to 45° (45° flexed CL radiography). The main purpose of this study was to evaluate the reliability and validity of this new method.
The study group included 93 patients who underwent total hip arthroplasty (THA). All hips were evaluated with computed tomography (CT) and both standard and 45° flexed CL radiographs to measure acetabular component anteversion the week after THA. The intraobserver and interobserver reliability of each measurement was assessed. Plain radiography measurements were compared with reference CT measurements to evaluate their validity.
All measurements had excellent intraobserver and interobserver reliability, and plain radiography measurements correlated well with CT measurements. The mean measurements were 21.9° (3°-39°) with CT, 24.9° (7°-47°; p<0.001) with standard CL radiographs, and 22.5° (7°-43°; p = 0.112) with 45° flexed CL radiographs.
The anteversion values measured with our new method were closer to the CT values used as a reference standard than those with standard CL radiographs. Our new method appears to be reliable and valid for measuring acetabular component anteversion.
Hip Int 2017; 27(3): 293 - 298
Article Type: ORIGINAL RESEARCH ARTICLE
AuthorsHajime Seo, Masatoshi Naito, Yoshinari Nakamura, Koichi Kinoshita, Tomohiro Nomura, So Minokawa, Tomohiko Minamikawa, Takuaki Yamamoto
- • Accepted on 14/08/2016
- • Available online on 31/01/2017
- • Published in print on 12/05/2017
This article is available as full text PDF.
- Seo, Hajime [PubMed] [Google Scholar] 1, * Corresponding Author (firstname.lastname@example.org)
- Naito, Masatoshi [PubMed] [Google Scholar] 2
- Nakamura, Yoshinari [PubMed] [Google Scholar] 3
- Kinoshita, Koichi [PubMed] [Google Scholar] 1
- Nomura, Tomohiro [PubMed] [Google Scholar] 4
- Minokawa, So [PubMed] [Google Scholar] 1
- Minamikawa, Tomohiko [PubMed] [Google Scholar] 1
- Yamamoto, Takuaki [PubMed] [Google Scholar] 1
Department of Orthopaedic Surgery, Fukuoka University Faculty of Medicine, Nanakuma, Fukuoka - Japan
Department of Orthopaedic Surgery, Fukuoka Sanno Hospital, Momochihama, Fukuoka - Japan
Department of Orthopaedic Surgery, Iida Hospital, Miyakonojo, Miyazaki - Japan
Department of Orthopaedic Surgery, Fukuoka University Chikushi Hospital, Chikushino, Fukuoka - Japan