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Cam deformity prior to hip arthroscopy can be characterized by the false-profile view
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The false-profile view effectively characterized cam deformity among patients undergoing hip arthroscopy for femoroacetabular impingement, according to results of this study.
Researchers retrospectively reviewed 45 patients who underwent hip arthroscopy between January 2011 and September 2012. All patients had a hip-protocol CT scan, as well as preoperative standing anteroposterior (AP) pelvis, 90° Dunn lateral and false-profile radiographs.
For the false-profile view, results showed 60% sensitivity and 89% specificity for the diagnosis of cam-type impingement. In addition, investigators found the view was 69% accurate for identifying cam impingement. Researchers also found a strong correlation between the false-profile view and the 2-o’clock and 3-o’clock positions on CT.
Similarly, the 90° Dunn lateral view and standing AP pelvis view both had a specificity of 89% for the diagnosis of cam deformities, according to the study. Sensitivity was 75% for the 90° Dunn lateral view and 25% for the standing anteroposterior pelvis view. Results showed the 90° Dunn lateral view strongly correlated with the 1-o’clock and 2-o’clock positions, while the standing AP pelvis view strongly correlated with the 12-o’clock and 1-o’clock positions on CT.
When researchers combined all radiographs, there was 86% sensitivity, 75% specificity, and 87% accuracy for the diagnosis of cam deformities. According to study results, there was an intraclass correlation coefficient of 0.93 for CT images and of 0.81 for false-profile radiographs. – by Casey Tingle
Disclosures: Hellman reports no relevant financial disclosures. Please see the full study for a list of all other authors’ relevant financial disclosures.
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