title: Difference in the acetabular cup orientation in standing and supine radiographs.
abstract: Acetabular orientation changes with that of the pelvis during lying and standing. This study was designed to measure these changes. We assessed 17 BHR replacements using EBRA software. The mean acetabular anteversion was more (p = 0.02) on erect than supine radiographs. Linear regression analysis showed that anteversion and inclination increased in some while decreased in others, and Bland and Altman analysis showed wide limits of agreement. The changes in acetabular orientation are thus subject to significant variations between the patients. We suggest studying the factors affecting acetabular orientation in standing to help reduce joint reaction forces and improve outcomes.
authors.affiliation: Newcastle Upon Tyne Hospitals NHS Trust, Freeman Hospital, Newcastle Upon Tyne, England NE7 7DN, United Kingdom.
authors.forename: Munir
authors.initials: M
authors.lastname: Khan
authors.affiliation: Newcastle Upon Tyne Hospitals NHS Trust, Freeman Hospital, Newcastle Upon Tyne, England NE7 7DN, United Kingdom.
authors.forename: Tom
authors.initials: T
authors.lastname: Beckingsale
authors.affiliation: Newcastle Upon Tyne Hospitals NHS Trust, Freeman Hospital, Newcastle Upon Tyne, England NE7 7DN, United Kingdom.
authors.forename: Martin
authors.initials: M
authors.lastname: Marsh
authors.affiliation: Newcastle Upon Tyne Hospitals NHS Trust, Freeman Hospital, Newcastle Upon Tyne, England NE7 7DN, United Kingdom.
authors.forename: Jim
authors.initials: J
authors.lastname: Holland
keywords: Anteversion; Hip; Inclination; Radiographs; Supine