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- Title
Validation of a new radiographic measurement of acetabular version: the transverse axis distance (TAD).
- Authors
Nitschke, Ashley; Lambert, Jeffery; Glueck, Deborah; Jesse, Mary; Mei-Dan, Omer; Strickland, Colin; Petersen, Brian; Lambert, Jeffery R; Glueck, Deborah H; Jesse, Mary Kristen
- Abstract
<bold>Objectives: </bold>This study has three aims: (1) validate a new radiographic measure of acetabular version, the transverse axis distance (TAD) by showing equivalent TAD accuracy in predicting CT equatorial acetabular version when compared to a previously validated, but more cumbersome, radiographic measure, the p/a ratio; (2) establish predictive equations of CT acetabular version from TAD; (3) calculate a sensitive and specific cut point for predicting excessive CT acetabular anteversion using TAD.<bold>Materials and Methods: </bold>A 14-month retrospective review was performed of patients who had undergone a dedicated MSK CT pelvis study and who also had a technically adequate AP pelvis radiograph. Two trained observers measured the radiographic p/a ratio, TAD, and CT acetabular equatorial version for 110 hips on a PACS workstation. Mixed model analysis was used to find prediction equations, and ROC analysis was used to evaluate the diagnostic accuracy of p/a ratio and TAD.<bold>Results: </bold>CT equatorial acetabular version can accurately be predicted from either p/a ratio (p < 0.001) or TAD (p < 0.001). The diagnostic accuracies of p/a ratio and TAD are comparable (p =0.46). Patients whose TAD is higher than 17 mm may have excessive acetabular anteversion. For that cutpoint, the sensitivity of TAD is 0.73, with specificity of 0.82.<bold>Conclusion: </bold>TAD is an accurate radiographic predictor of CT acetabular anteversion and provides an easy-to-use and intuitive point-of-care assessment of acetabular version in patients with hip pain.
- Subjects
ACETABULUM (Anatomy); COMPARATIVE studies; COMPUTED tomography; CONGENITAL hip dislocation; RESEARCH methodology; MEDICAL cooperation; RESEARCH; RESEARCH evaluation; EVALUATION research; RESEARCH bias; RETROSPECTIVE studies
- Publication
Skeletal Radiology, 2015, Vol 44, Issue 11, p1679
- ISSN
0364-2348
- Publication type
journal article
- DOI
10.1007/s00256-015-2225-2