Merle C, et al. - Researchers estimated the data to study the following: (A) evaluation of accuracy and reliability of native acetabular offset measurements conducted on conventional supine anterior-posterior (ap) pelvis radiographs with reference to computed tomography (CT) in end-stage hip osteoarthritis (OA) cases; (B) assessment of the minimum and maximum amount of medialization of the centre of rotation (COR) simulating various reaming techniques for acetabular preparation; and (C) identification of subjects at enhanced risk of excessive medialization of the COR. They observed potential changes of native COR with different acetabular reaming techniques which highlighted the differences in acetabular anatomy in primary OA cases. They reported a large number of subjects appearing at risk for excessive cup medialization when dependent on the preferred reaming technique. They supported the application of pre-operative AO evaluation and templating to enhance specific restoration of hip offset in candidates with primary hip OA.