Tibiofemoral contact pressures in radial tears of the meniscus treated with all-inside repair, inside-out repair and partial meniscectomy

•Analyze biomechanical properties of intra-compartmental contact pressures in the knee after radial tear•Compare all-inside repair, inside-out repair and partial meniscectomy for treatment of radial tears•Use a novel arthroscopic suture passer to complete all-inside meniscal repair

BackgroundTo test contact pressures in the knee after treatment of a radial meniscus tear with an all-inside meniscal repair technique and compare the results with inside-out repair and partial meniscectomy.MethodsSix non-paired cadaveric knees were analyzed with intra-compartment pressures measured at loads of 250 N, 500 N and 1000 N at 0°, eight degrees, 15°, and 30° of knee flexion. Compartmental contact pressures were measured for the intact medial meniscus, radial tear in the posterior horn, all-inside repair using the NovoStitch suture passer device (Ceterix Orthopaedics Inc., Menlo Park, CA), inside-out repair method, and partial meniscectomy. One-way ANOVA was used for statistical analysis.ResultsThe greatest differences in peak pressures between treatments were observed under 1000 N load at 30° flexion (0.8 ± (SD) 0.1 MPa (intact meniscus), 0.8 ± (SD) 0.1 MPa (all-inside), 0.9 ± (SD) 0.1 MPa (inside-out) and 1.6 ± (SD) 0.2 MPa (partial meniscectomy)). Treatment with partial meniscectomy resulted in the highest peak pressures compared to all other states (p < 0.0001 at each angle). Repair of the radial tear using the all-inside technique as well as the inside-out technique resulted in significantly decreased compartment pressures compared to partial meniscectomies (p < 0.0001 at each angle). There were no significant differences between peak pressures in the intact state and after repair with the all-inside or inside-out techniques.ConclusionAn all-inside repair technique using the NovoStitch suture passer can decrease contact pressures for a radial meniscus tear similarly to the inside-out repair technique when compared to partial meniscectomy.Clinical relevanceThis novel arthroscopic suture passer warrants further analysis in the clinical setting as it may be a reliable method for repair of radial meniscal tears through an arthroscopic all-inside technique.