Perlepe V, Michoux N, Kirchgesner T, et al. - This study was sought to correlate tomographic (TUS) with radiographic (RUS) union scores in nailed shaft fractures during normal healing and in non-unions. For nailed femoral or tibial shaft fractures, two radiologists blinded to fracture age separately ascertained RUS and TUS by analyzing the radiographic and CT examinations obtained in 47 patients during normal healing (early fracture group; 24 study participants, 17 men,19 tibias, mean fracture-CT delay 109 ± 57 days [42-204 days]) and in surgically proven non-united fractures (late fracture group, 23 patients, 14 men, 12 tibias, mean fracture-CT delay 565 ± 519 days[180-1983 days]). Researchers ascertained the inter-and intra-observer agreement of RUS and TUS and matched TUS with RUS. This study’s findings demonstrate that RUS and TUS of nailed shaft fractures during normal healing or in non-unions are both feasible and reproducible. In fractures, they yield similar values with no or limited callus. In fractures with callus, TUS yields lower values than RUS.