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Open Meniscal Allograft Transplantation With Transosseous Suture Fixation of the Meniscal Body Significantly Decreases Meniscal Extrusion Rate Compared With Arthroscopic Technique

      Purpose

      To assess and compare meniscal extrusion rates after lateral “bridge-in-slot” meniscal allograft transplantation (MAT) with arthroscopic versus open insertion.

      Methods

      In this review of prospectively collected data, we analyzed data from patients who underwent arthroscopic or open lateral MAT. Patients who underwent concomitant distal femoral osteotomy, for whom 1-year postoperative magnetic resonance imaging was unavailable, or who underwent open lateral MAT without the use of transosseous sutures were excluded. Meniscal extrusion in the included patients was assessed by 2 independent examiners by measuring the absolute value and the relative percentage of extrusion on 1.5-T magnetic resonance images at 1-year follow-up. The number of MATs with radial displacement larger or smaller than 3 mm was determined.

      Results

      A total of 20 patients met the inclusion criteria, of whom 10 underwent arthroscopic and 10 underwent open lateral MAT. No statistically significant differences were found in baseline demographic data. Absolute meniscal extrusion was similar between the groups (P = .091). A significantly larger relative percentage of extrusion (arthroscopic MAT, 31 ± 27 mm; open MAT, 10 ± 29 mm; 95% confidence interval, –0.4 to –0.02 mm; P = .03) and a significantly higher extrusion rate were found in patients treated with arthroscopic MAT than in those treated with open MAT (>3 mm in 5 patients [50%] with arthroscopic MAT and 0 patients with open MAT, P = .01).

      Conclusions

      This study identified similar absolute extrusion and significantly lower postoperative lateral meniscal extrusion rates after open MAT compared with arthroscopic MAT. Transosseous fixation of the meniscal body appears protective against meniscal extrusion after MAT.

      Level of Evidence

      Level III, case-control study.
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