Saracco A, Grassi A, Romagnoli M, et al. - This study was sought to distinguish which diagnostic imaging modality, between AP pelvis x-rays, the AP Pelvis CT Scout image and reduced-dose axial CT scan, is the most precise to evaluate cup version of an all-ceramic hip resurfacing implant in a first-in-human clinical trial. Researchers retrospectively examined the cup version of the first 20 patients who had undergone an experimental all-ceramic hip resurfacing on AP pelvis x-rays (0.8 mSv of radiation), AP pelvis CT scout images (0.016 mSv) and axial CT slices conducted applying a reduced dose protocol (0.3 mSv). They estimated intra-observer and inter-observer reliabilities. The outcomes reveal that reduced dose CT is a valid modality to assess acetabular cup version after ceramic hip resurfacing due to lower radiation exposure and highest accuracy. Evidence demonstrate that plain x-rays are not accurate nor precise to measure version, whereas high agreement of measurements between AP Pelvis CT Scout and axial pelvis CT scan was noted.