D. Son (Seoul, KR)
Kangbuk Samsung Hospital Orthopedic SurgeryPresenter Of 1 Presentation
18.4.7 - Meniscal Extrusion Does Not Affect Morphologic Changes of Lateral Meniscus Allograft During Midterm Follow-up
Abstract
Purpose
To investigate the change of meniscal allografts size, and the changes of intrameniscal signal intensity after MAT according to extrusion.
Methods and Materials
Ninety-one patients who underwent lateral MAT between 2008 and 2013 were retrospectively evaluated by serial magnetic resonance imaging scans 6 weeks, 1 year, and midterm (3- to 7- year) after surgery. Degenerative morphological change was evaluated by postoperative change of meniscal width, thickness, and intrameniscal signal intensity. At each time point, the width and thickness of the menisci at anterior horn, mid-body, and posterior horn were compared between extruded group and extruded group. The ratio of the signal intensity of the transplanted meniscus allograft to that of the control medial meniscus in the ipsilateral knee was calculated to obtain a standardized signal intensity value. The change of signal intensity was evaluated at each part of anterior horn, mid-body, and posterior horn.
Results
Fifty-seven knees (63%) were classified as nonextruded and 34 (37 %) as extruded. Between extruded and nonextruded groups, there was no significant difference in the meniscuscal width, thickness, and signal intensity at anterior horn (p=0.546, p=0.475, and p=0.114, respectively), mid-body(p=0.975, p=0.716, and p=0.415, respectively), and posterior horn(p=0.394, p=0.476, and p=0.420, respectively) during mid-term follow-up. The change of meniscal width and signal intensity did not correlate with Lysholm score. (p>0.5)
Conclusion
After MAT, the meniscus width, thickness, and signal intensity were not related with meniscus extrusion during midterm follow-up. Although overall meniscus width and thickness was decreased after lateral MAT, meniscal extrusion had no effect on the postoperative change of meniscus width, thickness and relative intrameniscal signal intensity during mid-term follow-up. Long-term evaluation is needed to evaluate the natural course of meniscus extrusion after MAT.