Innmann MM, et al. - This study was intended to determine the optimal protocol for distinguishing individuals with mobile hips and stiff lumbar spines and identify clinical and standing radiographic parameters predicting these individuals. Researchers prospectively examined a cohort of 113 individuals with end-stage hip osteoarthritis awaiting THA. This research analyzed clinical data, patient-reported outcome measures, and spinopelvic radiographs with the patient in the standing, “relaxed-seated,” and “deep-flexed seated” position. A “hip user index” was estimated evaluating the percentage of sagittal hip movement correlated with overall movement between the standing and deep-flexed seated position. The study found that individuals awaiting THA and having combined high hip and lowered lumbar spine mobility can be screened for with lateral standing radiographs of the spinopelvic complex. Compared with relaxed-seated radiographs, hip user verification should be done applying radiographs in the deep-flexed seated position due to a higher accuracy.