Objective To analyze intra and interobserver agreement of two radiographic methods for evaluation of posterolateral lumbar arthrodesis. Methods Twenty patients undergoing instrumented posterolateral fusion were evaluated by anteroposterior and dynamic lateral radiographs in maximal flexion and extension. The images were evaluated initially by 6 orthopedic surgeons, and after 8 weeks, reassessed by 4 of them, totaling 400 radiographic measurements. Intra and interobserver reliability were analyzed using the Kappa coefficient and Landis and Koch criteria. Results Intra and interobserver agreement regarding […]