Radiographic quantification of dynamic hip screw migration.
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ABSTRACT: Purpose
This 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.Methods
Femoral 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.Results
The 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).Conclusion
The presented method allows quantification of DHS® migration with adequate bias correction due to femoral rotation and flexion.
SUBMITTER: Audige L
PROVIDER: S-EPMC3971271 | biostudies-literature | 2014 Apr
REPOSITORIES: biostudies-literature
Publications
Radiographic quantification of dynamic hip screw migration.
Audigé Laurent L Cagienard Flurin F Sprecher Christoph Martin CM Suhm Norbert N Müller Marc Andreas MA
International orthopaedics 20131022 4
<h4>Purpose</h4>This 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.<h4>Methods</h4>Femoral 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 ...[more]
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