Radiographic quantification of dynamic hip screw migration |
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Authors: | Laurent Audigé Flurin Cagienard Christoph Martin Sprecher Norbert Suhm Marc Andreas Müller |
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Institution: | 1. AO Clinical Investigation and Documentation, AO Foundation, Duebendorf, Switzerland 2. Department of Orthopaedic Surgery and Traumatology, University Hospital of Basel, Spitalstrasse 21, CH-4031, Basel, Switzerland 3. AO Research Institute, AO Foundation, Davos, Switzerland
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Abstract: | PurposeThis study aimed to propose a technique to quantify dynamic hip screw (DHS®) migration on serial anteroposterior (AP) radiographs by accounting for femoral rotation and flexion.MethodsFemoral rotation and flexion were estimated using radiographic projections of the DHS® plate thickness and length, respectively. The method accuracy was evaluated using a synthetic femur fixed with a DHS® and positioned at pre-defined rotation and flexion settings. Standardised measurements of DHS® migration were trigonometrically adjusted for femoral rotation and flexion, and compared with unadjusted estimates in 34 patients.ResultsThe mean difference between the estimated and true femoral rotation and flexion values was 1.3° (95 % CI 0.9–1.7°) and ?3.0° (95 % CI – 4.2° to ?1.9°), respectively. Adjusted measurements of DHS® migration were significantly larger than unadjusted measurements (p?=?0.045).ConclusionThe presented method allows quantification of DHS® migration with adequate bias correction due to femoral rotation and flexion.Electronic supplementary materialThe online version of this article (doi:10.1007/s00264-013-2146-4) contains supplementary material, which is available to authorised users. |
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Keywords: | Dynamic hip screw Migration Hip fracture Radiographic quantification |
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