Delayed but favourable outcome of lateral tibial plateau fracture after screw fixation: A 3-year prospective cohort study of 56 patients.

BACKGROUND

Although a large number of studies aimed to investigate the outcome following lateral tibial plateau fractures, the literature includes limited information on mid- to long-term follow up. The primary objective of the present study was to investigate the 3-year development in Knee Injury and Osteoarthritis Outcome Score (KOOS) of patients with surgically managed lateral tibial plateau fractures.

METHODS

Prospective cohort study. The study includes all patients treated surgically following a lateral tibial plateau fracture (AO-41B) in the period December 2013 to November 2016. The primary outcome measurement was the patient-reported KOOS score. Secondary outcome measurements were quality of life, knee osteoarthritis, muscle strength, pain reactions, and gait function.

RESULTS

Fifty-six patients were included. Thirty-nine patients were eligible for the 3-year follow up (70%). The mean age at the time of the 3-year follow up was 58.3 years with a range of 25-89. The 3-year postoperative mean KOOS scores were 75.5 (95% confidence interval: 68.6-82.3). Compared with the KOOS score at 12-month follow up (61.3), a significant increase was observed (P > 0.001). In comparison with the established KOOS reference population, the study population showed statistically worse KOOS outcomes only for the subscale sport.

CONCLUSIONS

Patient-reported outcome (KOOS) among patients with a fracture of the lateral tibial plateau increased significantly between the 1-year and 3-year follow ups. In contrast to the 1-year follow up, patients at the 3-year follow up reported results comparable to those of a healthy reference population, excluding the Sport subscale. Guiding the patients in anticipation of a prolonged recovery period is highly important in everyday clinical practice.