Weber, M. and Lechler, P. and von Kunow, R. and Voellner, F. and Keshmiri, A. and Hapfelmeier, A. and Grifka, J. and Renkawitz, T. (2015) The validity of a novel radiological method for measuring femoral stem version on anteroposterior radiographs of the hip after total hip arthroplasty. BONE & JOINT JOURNAL, 97B (3). pp. 306-311. ISSN 2049-4394,
Full text not available from this repository. (Request a copy)Abstract
Femoral stem version has a major influence on impingement and early post-operative stability after total hip arthroplasty (THA). The main objective of this study was to evaluate the validity of a novel radiological method for measuring stem version. Anteroposterior (AP) radiographs and three-dimensional CT scans were obtained for 115 patients (female/male 63/72, mean age 62.5 years (50 to 75)) who had undergone minimally invasive, cementless THA. Stem version was calculated from the AP hip radiograph by rotation-based change in the projected prosthetic neck-shaft (NSA*) angle using the mathematical formula ST = arcos [tan (NSA*) / tan (135)]. We used two independent observers who repeated the analysis after a six-week interval. Radiological measurements were compared with 3D-CT measurements by an independent, blinded external institute. We found a mean difference of 1.2 degrees (SD 6.2) between radiological and 3D-CT measurements of stem version. The correlation between the mean radiological and 3D-CT stem torsion was r = 0.88 (p < 0.001). The intra- (intraclass correlation coefficient >=. 0.94) and inter-observer agreement (mean concordance correlation coefficient = 0.87) for the radiological measurements were excellent. We found that femoral tilt was associated with the mean radiological measurement error (r = 0.22, p = 0.02). The projected neck-shaft angle is a reliable method for measuring stem version on AP radiographs of the hip after a THA. However, a highly standardised radiological technique is required for its precise measurement.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ANTEVERSION; REPLACEMENT; IMPINGEMENT; OSTEOARTHRITIS; DESIGN; MOTION; OFFSET; RANGE; |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Orthopädie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Jul 2019 11:29 |
| Last Modified: | 24 Jul 2019 11:29 |
| URI: | https://pred.uni-regensburg.de/id/eprint/5876 |
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