Reahl GB, et al. - Researchers performed this retrospective observational cohort study to identify the risk factors for knee stiffness surgery after tibial plateau fixation. They examined 110 patients who had knee stiffness surgery (manipulation while under anesthesia, arthroscopic lysis of adhesion, or quadricepsplasty) at a time remote from open reduction and internal fixation of tibial plateau fractures. Also, those who did not undergo knee stiffness surgery and who had either a minimum of 1 year of follow-up or clearly documented range of motion ≥110 degrees with a minimum of 90 days of follow-up were examined as controls (319 patients). Strong risk factors for knee stiffness surgery were time spent in external fixation and the presence of bilateral tibial plateau injuries.