Key result
Hips with cam impingement evaluated via frog-leg lateral radiograph showed a greater average alpha-angle (65 vs 47 degrees) and decreased head-neck offset (6.6 vs 9.3 mm) compared to control hips.
Why the study?
Does the frog-leg lateral radiograph accurately assess femoral head-neck offset abnormalities associated with cam femoroacetabular impingement compared to control hips?
Population
61 hips treated for cam impingement and 24 asymptomatic control hips
Comparison
Frog-leg lateral radiograph vs Asymptomatic control hips
Design
Case-control
Authors
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Frog-leg lateral radiographs accurately visualize cam lesions; leaves open optimal protocol versus cross-table views in FAI evaluation.
Case-Control (n=85)
Does the frog-leg lateral radiograph accurately assess femoral head-neck offset abnormalities associated with cam femoroacetabular impingement compared to control hips?
Absolute Event Rate: 65% vs 47%
The frog-leg lateral radiograph provides accurate visualization of the femoral head-neck offset in patients being evaluated for femoroacetabular impingement.
Clohisy et al. (2007) conducted a case-control in Cam femoroacetabular impingement (n=85). Cam femoroacetabular impingement vs. Asymptomatic control hips was evaluated on Average alpha-angle on frog-leg lateral view. Hips with cam impingement evaluated via frog-leg lateral radiograph showed a greater average alpha-angle (65 vs 47 degrees) and decreased head-neck offset (6.6 vs 9.3 mm) compared to control hips.
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