Tibial Plateau fractures are injuries that usually result from high energy trauma, especially those involving motorcycle accidents.The association of meniscal and ligament injuries in this type of fracture is described in the literature, especially grade IV, V and VI, according to the Schatzker classification.Purpose: To know the frequency of injuries of the major ligaments in patients with tibial plateau fracture according to the Schatzker classification and to present a sub-group of patients intervened due to anterior and/or posterior instability, describing the type of lesion, its location, the treatment used and the short-term follow-up. Materials and Methods:We reviewed the medical records of the patients who were diagnosed with tibial plateau fracture from January 2014 to January 2018, analyzing the type of fracture according to Schatzker and those who presented secondary ligament instability diagnosed after the consolidation of the fracture.Results: A total of 302 patients with tibial plateau fractures were presented, of which 63 (20.8%) had involvement of one or more of the major ligaments.The lesions occurred in all types of fracture primarily in type II, V and VI.The most frequent ligament torn was the Anterior Cruciate Ligament (ACL) in 52 patients (17.2%), with the type II fracture causing the most injury.Of the 63 patients with instability, for administrative reasons only 13 patients (20%) were operated, 11 of whom had ACL injury.91% of the ligament injuries found at the time of surgery preserved a large part of their remnant's fibers with elongation. Conclusion:Tibial plateau fractures have a high association of lesions in the major ligaments, presenting in this study in one per five patients.