| Item type: | Article | ||||
|---|---|---|---|---|---|
| Journal or Publication Title: | RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren | ||||
| Publisher: | GEORG THIEME VERLAG KG | ||||
| Place of Publication: | STUTTGART | ||||
| Volume: | 188 | ||||
| Number of Issue or Book Chapter: | 06 | ||||
| Page Range: | pp. 574-581 | ||||
| Date: | 2016 | ||||
| Institutions: | Medicine > Lehrstuhl für Orthopädie Medicine > Zentren des Universitätsklinikums Regensburg > Zentrum für Klinische Studien | ||||
| Identification Number: |
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| Keywords: | PLAIN ANTEROPOSTERIOR RADIOGRAPHS; COMPONENT POSITION; PELVIC TILT; NAVIGATION; ANTEVERSION; RELIABILITY; REPLACEMENT; VERSION; THA; total hip arthroplasty; cup orientation measurement; error analysis; pelvic tilt | ||||
| Dewey Decimal Classification: | UNSPECIFIED | ||||
| Status: | Published | ||||
| Refereed: | Yes, this version has been refereed | ||||
| Created at the University of Regensburg: | Yes | ||||
| Item ID: | 42138 |
Web of ScienceAbstract
Purpose: The aim of this prospective study is to validate a vector arithmetic method for measuring acetabular cup orientation after total hip arthroplasty (THA) and to verify the clinical practice. Materials and Methods: We measured cup anteversion and inclination of 123 patients after cementless primary THA twice by two examiners on AP pelvic radiographs with a vector arithmetic method and ...
Abstract
Purpose: The aim of this prospective study is to validate a vector arithmetic method for measuring acetabular cup orientation after total hip arthroplasty (THA) and to verify the clinical practice. Materials and Methods: We measured cup anteversion and inclination of 123 patients after cementless primary THA twice by two examiners on AP pelvic radiographs with a vector arithmetic method and compared with a 3D-CT based reconstruction model within the same radiographic coronal plane. Results: The mean difference between the radiographic and the 3D-CT measurements was - 1.4 degrees +/- 3.9 degrees for inclination and 0.8 degrees +/- 7.9 degrees for anteversion with excellent correlation for inclination (r = 0.81, p < 0.001) and moderate correlation for anteversion (r = 0.65, p < 0.001). The intraclass correlation coefficient for measurements on radiographs ranged from 0.98 (95 %-CI: 0.98; 0.99) for the first observer to 0.94 (95 %-CI: 0.92; 0.96) for the second observer. The interrater reliability was 0.96 (95 %-CI: 0.93; 0.98) for inclination and 0.93 (95 %-CI: 0.85; 0.96) for anteversion. Conclusion: The largest errors in measurements were associated with an extraordinary pelvic tilt. In order to get a valuable measurement for measuring cup position after THA on pelvic radiographs by this vector arithmetic method, there is a need for a correct postoperative ap view, with special regards to the pelvic tilt for the future. Key points: Measuring acetabular cup orientation on anteroposterior radiographs of the hip after THA is a helpful procedure in everyday clinical practice as a first-line imaging modality. CT remains the golden standard to accurately determine acetabular cup position. Future measuring on radiographs for cup orientation after THA should account for integration of the pelvic tilt in order to maximize the measurement accuracy. Citation Format: Craiovan B, Weber M, Worlicek M et al. Measuring Acetabular Cup Orientation on Antero-Posterior Radiographs of the Hip after Total Hip Arthroplasty with a Vector Arithmetic Radiological Method. Is It Valid and Verified for Daily Clinical Practice?. Fortschr Rontgenstr 2016; 188: 574-581
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