Inui H, Yamagami R, Kono K, et al. - This research was sought to correlate these parameters of navigation-assisted unicompartmental knee arthroplasty (UKA) performed by experienced and inexperienced surgeons. Researchers enrolled a total of 209 UKA procedures using an image-free navigation system [one experienced surgeon performed 128 UKAs (E group), and six inexperienced surgeons performed 81 UKAs (I group)]. They compared prosthetic alignments and clinical results between the two groups. Inexperienced surgeons achieved accurate alignments and excellent clinical results similar to an experienced surgeon using a navigation system during UKA. Nevertheless, it was shown that tibial periprosthetic fractures occurred more often in patients of inexperienced surgeons. Inexperienced surgeons need to demonstrate careful and cautious surgical techniques even when using a navigation system.