2015 ISAKOS Biennial Congress ePoster #1618

The Patient-Related Risk Factors for the Extrusion of Lateral Meniscal Allograft Transplants

Seong-Il Bin, MD, PhD, Seoul KOREA, REPUBLIC OF
Seung-Suk Seo, MD, PhD, Busan KOREA, REPUBLIC OF
Jong-Min Kim, MD, PhD, Seoul KOREA, REPUBLIC OF

Asan Medical Center, Seoul, KOREA

FDA Status Not Applicable

Summary: Lateral Meniscal allograft extrusion is affected by the degree of intraoperative cartilage wear, rather than age, gender, alignments or radiographic arthritic changes.




The objective of this study was to identify the patient-related risk factors for lateral meniscal extrusion after lateral meniscal allograft transplantation (MAT) regarding demographic characteristics, alignment, and pre-existing arthrosis.


Seventy-one patients who underwent arthroscopic lateral MAT using bone bridge fixation between Feb 2008 and Jan 2011 were assessed. Lateral meniscal subluxation was measured on mid-coronal image of magnetic resonance images one year postoperatively. Subluxation of more than 3 mm was considered to be extrusion. Age, gender, body mass index, time from previous meniscectomy, mechanical axes deviation, Kellgren-Lawrence grade on preoperative radiographs, and intraoperative ICRS grade were assessed as possible patient-related factors.


The mean lateral subluxation on coronal plane was 2.6±1.6 mm. Twenty three transplants among our patients (32.4%) showed extrusion. The intraoperative cartilage status of the femoral condyle and tibial plateau showed significant differences between nonextruded (=3mm) and extruded (>3mm) groups (P=0.010 and P=0.001, respectively). There were no differences in other factors between these two groups. Binary logistic regression analysis revealed that a tibial side cartilage wear of ICRS grade 3 or more was a significant risk factor for meniscal extrusion.


Lateral meniscal extrusion one year after lateral MAT is affected by the degree of intraoperative cartilage wear, most notably on the tibial side. Patient demographics, alignments and radiographic arthritic changes did not differ between nonextruded and extruded MAT cases.