ObjectivesKnee arthrofibrosis is a common complication after surgical fixation of tibial spine fractures. However, there is no standardized treatment modality for resultant arthrofibrosis, with some surgeons electing for non-operative management, while others prefer manipulation under anesthesia with a possible arthroscopic lysis of adhesions, if indicated. To better understand indications and outcomes from these treatment modalities for arthrofibrosis, we examined patients treated by both approaches. MethodsWe performed a multicenter retrospective case series of patients with arthrofibrosis after tibial spine fracture surgery. Arthrofibrosis was defined as loss of knee extension ≥ 10.0° and/or knee flexion ≥ 25.0° compared to the contralateral, uninjured knee at three months following index surgery. Patients were organized into two cohorts: non-operative and operative treatment. Data was collected for demographics, fracture classification, concomitant injuries, treatment timeline, and knee range of motion. ResultsThere were 16 patients in the operative group and 10 patients in the non-operative group. At the time of diagnosis, the operative group had a mean 10° larger flexion deficit compared to the non-operative group. Both treatment modalities resulted in similar ranges of motion at terminal evaluation. Final flexion was recorded as 130° in the operative group and 127° in the non-operative group. Final extension deficits were 3° in both cohorts. ConclusionsOperative and non-operative treatment modalities can be effective in management of knee arthrofibrosis after fixation of tibial spine fractures. Non-operative treatment may be more suitable for milder range of motion deficits, but further research is necessary to guide clinical practice. Level of EvidenceLevel IV, Case Series;