Study finds, differences in Spinopelvic Characteristics Betw
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This study of patients with hip primary osteoarthritis (OA) and a matched, asymptomatic, volunteers (controls) group, researchers aimed to determine spinopelvic differences between the two groups and their consequences for THA.

Analysis included 104 subjects (52 in each group) that had their sagittal spinopelvic parameters (lumbar lordosis angle, sacral slope, pelvic tilt, pelvic incidence and the pelvic-femoral angle) measured in the standing, relaxed-seated and deep-flexed seated positions. Spinopelvic movement was calculated as the change between the different positions and individual spinopelvic mobility was classified according to the change in pelvic tilt as previously described (deltaPT: stiff (less than 10°), normal (10–30°), hypermobile (more than 30°).

--Transitioning from the standing to relaxed-seated position, patients demonstrated 13 less hip flexion, 12 more posterior pelvic tilt and 6 more lumbar flexion compared to controls.

--Transitioning from the standing to deep-flexed seated position, patients demonstrated 18 less hip flexion, accompanied by a posterior and not an anterior pelvic tilt as in the controls (7±14 vs. -6±17).

--Patients showed a higher percentage of spinopelvic hypermobility (19% vs. 2%).

Finally, the arthritic hip's decreased flexion capacity causes a posterior pelvic tilt in the relaxed-seated posture. In order to maintain an upright posture, this is possibly associated with increased lumbar flexion as a compensatory mechanism. As a result, pathological spinopelvic hypermobility must be established. Reduced flexion of the arthritic hip prevents the pelvis from tilting anteriorly while shifting to the deep-flexed sitting position, while the lumbar spine performs a compensatory flexion of about the same amount as controls.