Use of the False-Profile Radiographic View to Measure Pelvic Incidence

The American Journal of Sports Medicine
Ryan T LiMichael J Salata

Abstract

Pelvic incidence (PI) is an important variable in assessing spinopelvic balance that is associated with hip pathology. A lateral radiograph of the pelvis can be used to measure PI, but this view is not routinely performed in the clinical setting during evaluation of hip pain. The false-profile (FP) radiographic view of the hip is commonly obtained to measure acetabular coverage. To evaluate the tolerance of PI measurements to pelvic rotation and assess the feasibility of using an FP radiograph to obtain an accurate measurement of PI. Cohort study (diagnosis); Level of evidence, 2. A mathematical model was developed to predict the change in PI with rotation. Fluoroscopic images were obtained of 6 reconstructed cadaveric adult pelvis and femur specimens at varying degrees of rotation, including a perfect lateral and FP image. PI was measured with the midpoint between the centers of the femoral heads as a reference point. The findings were confirmed clinically by retrospectively reviewing FP radiographs and computed tomography (CT) scans of 40 clinical patients. PI was measured on FP radiographs and CT scans by 2 independent reviewers. With dry cadaveric pelvis specimens, the discrepancy in PI measured between fluoroscopic FP and ...Continue Reading

References

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Sep 10, 2014·The American Journal of Sports Medicine·Jeremy J GebhartMichael J Salata
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Sep 22, 2016·Bone & Joint Research·W Z MorrisR W Liu

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Citations

Sep 25, 2019·Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy·Ryan T LiMichael J Salata
Apr 16, 2020·Journal of Orthopaedics·Cort D LawtonMichael A Terry

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