Abstract:Objective: To investigate the surgical technique and clinical outcomes of modified posterolateral straight incision with T-shaped plate in the treatment of posterolateral tibial plateau fracture. Methods: Retrospective analysis was performed on the medical records of 25 patients with posterolateral tibial plateau fractures who underwent surgical treatment from January 2016 to February 2019, including 20 males and 5 females, 10 patients with left knee and 15 patients with right knee,the age of the patients ranged from 27 to 65 years old, with an average age of 46.5 years old. At the last follow-up, the knee function of the affected side was evaluated using the knee scoring system of US hospital for special surgery (HSS), and the reduction of tibial plateau fractures was evaluated using Rasmussen scoring.Results: All the 25 patients were followed up for 12 ~ 24 months, with an average of 16.2 months. The comparison of Tibial Plateau-Tibial Shaft Angle (TP-TSA) and Posterior Slope measured on X-ray immediately, 3 months, 6 months and 12 months after the operation showed no statistically significant difference. The X-ray of the last follow-up showed all fractures were primary healing, the articular surface was flat, the reduction was not lost, and there was no internal fixation looseness or broken. The Rasmussen score of the last follow-up was 10~18, among which 14 cases were excellent, 10 cases were good and 1 case was ok, with an excellent and good rate of 96% (24/25).The HSS score was 67~96 points, among which 13 cases were excellent, 9 cases were good, and 3 cases were ok. The excellent and good rate was 88% (22/25). Conclusions: In the treatment of posterolateral tibial plateau fracture using modified posterolateral straight incision with T-shaped plate, although the operative exposure is limited, the surgical trauma is small, and the reduction of posterolateral fracture can be conducted under direct vision, it is helpful for bone grafting and support fixation with T-shaped plate, and the clinical efficacy is satisfactory