['Lateral meniscus allograft transplantation (LMAT) is a feasible surgical option for young meniscus-deficient patients. Although several studies have explored the factors that contribute to graft extrusion, they have not been fully elucidated. The aim of this study was to determine the various factors that contribute to graft extrusion.', 'Patients with knees that had received LMAT using a keyhole technique (n\xa0=\xa087 knees in 82 patients) were reviewed. The median age of these patients was 22\xa0years (range 19-54\xa0years), and the median postprocedural follow-up interval was 5\xa0days (range 1-136\xa0days). Twelve magnetic resonance imaging (MRI) measurement parameters (axial and coronal location of the bone block) that could potentially influence graft extrusion were evaluated, along with absolute graft extrusion and relative percentage of extrusion (RPE).', 'A significant correlation was found between 8 of the 12 MRI measurement parameters and both the absolute extrusion and RPE (r\xa0=\xa00.241-0.438, p\xa0<\xa00.05). The absolute middle distance and depth of the bone block were independent predictors of the absolute extrusion (β\xa0=\xa00.30 and 0.15, respectively; p\xa0<\xa00.05), and the relative middle distance and relative bone-block elevation were found to be predictors of RPE (β\xa0=\xa02.29 and 1.44, respectively; p\xa0<\xa00.05).'] Do various factors contribute to graft extrusion in lateral meniscus allograft transplantation?