High Tibial Osteotomy With Medial Meniscal Posterior Root Tear Reconstruction Yields Improved Radiographic and Functional Outcomes and Healing Rates Compared With Osteotomy Alone.

ABSTRACT

PURPOSE: To compare preoperative and postoperative clinical and radiologic outcomes between patients undergoing high tibial osteotomy (HTO) with medial meniscal posterior root tear (MMPRT) reconstruction using gracilis tendon graft and those undergoing HTO without MMPRT reconstruction. METHODS: Patients with MMPRTs who underwent HTO between January 2018 and December 2021 with minimum 2-year follow-up were included. All patients were divided into 2 groups based on whether they underwent meniscal root reconstruction with tendon graft HTO alone (33 cases) and HTO with MMPRT reconstruction (21 cases). Clinical evaluation included the Lysholm score, International Knee Documentation Committee (IKDC) score, and visual analog scale (VAS) score. Functional recovery and radiologic outcomes of the knees were evaluated at the latest follow-up. Meniscal root healing rates and medial meniscal extrusion according to a second magnetic resonance imaging reading were compared between the 2 groups at the latest follow-up. RESULTS: The results showed statistically significant improvements in the postoperative Lysholm score, IKDC score, and VAS score in both groups at the latest follow-up (P < .001). Analysis of the minimal clinically important difference for postoperative outcomes revealed that the percentage of patients who reached the minimal clinically important difference threshold was 100% for the Lysholm score, 100% for the IKDC score, and 100% for the VAS score in the HTO-MMPRT reconstruction group. In comparison, the percentages were 87.9% for the Lysholm score, 90.9% for the IKDC score, and 100% for the VAS score in the HTO-alone group. Additionally, compared with the HTO-alone group, the HTO-MMPRT reconstruction group using gracilis tendon graft showed significantly improved meniscal root healing rates (complete healing, 85.7% vs 45.4% [95% confidence interval, 0.003-0.007]; P = .001) and functional recovery (P < .005) at the final follow-up. Additionally, the HTO-MMPRT reconstruction group showed significantly more improvement in the Kellgren-Lawrence grade (10 of 21 knees vs 6 of 33 knees with improved Kellgren-Lawrence grade, P = .033) and medial meniscal extrusion (2.1 ± 1.0 mm vs 3.1 ± 1.6 mm [95% confidence interval, 0.3-1.7 mm]; P = .007) compared with the HTO-alone group. CONCLUSIONS: HTO with reconstruction of the meniscal root using a tendon graft resulted in improved radiographic and patient-reported outcomes, as well as improved healing rates, compared with HTO alone. LEVEL OF EVIDENCE Level III, retrospective case-series comparison.