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Pelvic morphology helps diagnose development dysplasia of the hip
Researchers found various indirect pelvic morphology parameters were helpful in the differentiation of development dysplasia of the hip and acetabular retroversion, according to this study.
Using the anterior inferior iliac spine (AIIS) sign, ilioschial angle, obturator index and pelvic width index, researchers studied 51 patients with development dysplasia of the hip (DDH) and 51 patients with acetabular retroversion, according to the abstract.
“Pelvic morphology is associated with acetabular pathomorphology,” Moritz Tannast, MD, and colleagues stated in the abstract. “Our measurements, except the AIIS sign, are direct indicators of acetabular retroversion. The data suggest they can be used when the acetabular rim is not clearly visible and retroversion is not obvious.”
There was a higher prevalence of the AIIS sign, lower pelvic width index and lower obturator index in the acetabular retroversion group, according to the abstract. For patients with DDH, the entire innominate bone is internally rotated, while the bone is externally rotated in acetabular reversion, the researchers stated.
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Tannast M. Clin Orthop Rel Res. 2012. doi:10.1007/s11999-012-2473-6.