Arthroscopic meniscal posterior root repair combined with centralization reduces medial menicus extrusion associated with posterior root tears: One-year clinical outcomes

Purpose: This study aimed to assess the short-term clinical efficacy of combining posterior meniscal root repair with meniscal centralization technology in the treatment of medial meniscus posterior root tears (MMPRTs) and notable meniscus extrusion. Methods: In this retrospective analysis, patients aged 43-76 years with only chronic posterior root tears of the medial meniscus and notable extrusion were followed up for 12-14 months. Inclusion criteria: (1) persistent medial knee joint pain affecting daily life, presenting with joint space tenderness; (2) showing the ineffectiveness of conservative treatment for a minimum of 3 months; conservative treatment includes non-invasive methods such as nonsteroidal anti-inflammatory drugs, physical therapy and massage, but does not include intra-articular injections. (3) Kellgren-Lawrence Grades 0-II osteoarthritis (OA) of the knee joint; and (4) diagnosis of a posterior root tear of the medial meniscus with notable meniscus extrusion confirmed through knee-joint plain magnetic resonance imaging (MRI) scans, where coronal image revealed a meniscus body extrusion of >= 3 mm. Exclusion criteria: (1) Kellgren-Lawrence Grades III-IV OA in the knee joint; (2) presence of knee joint infection or other structural damage to the knee joint; (3) history of previous knee joint surgery; (4) demonstrating joint instability or abnormal lower-limb alignment (varus deformity >5 degrees); and (5) presence of severe mental illness, coagulation disorders, or other serious medical conditions. The Lysholms score, the Hospital for Special Surgery (HSS) knee score, the visual analogue scale (VAS) score and meniscal extrusion values were evaluated before and after surgery in 23 patients through a comparative analysis. Results: The results of the follow-up conducted 12-14 months post-operatively indicated a significant improvement in the patients' conditions. In particular, the Lysholms scores (preoperative: 50.9 +/- 10.2; 1-year post-surgery: 72.0 +/- 8.4), HSS knee scores (preoperative: 45.9 +/- 10.6; 1-year post-surgery: 79.1 +/- 11.1) and VAS scores (preoperative: 4.0 +/- 1.1; 1-year post-surgery: 0.9 +/- 0.7) exhibited notable enhancements. Furthermore, compared to the preoperative values, the degree of meniscus extrusion measured by coronal MRI of the knee joint significantly improved post-operatively (preoperative: 3.7 +/- 0.8 mm; 1-year post-surgery: 2.2 +/- 0.6 mm). These findings all yielded a p < 0.05, signifying statistical significance. Conclusion: In patients with chronic MMPRTs and notable extrusion, a combination of posterior meniscal root repair and centralization technology can effectively restore meniscus function and rectify the medial meniscus displacement, resulting in favourable short-term clinical outcomes.