Table 3 Risk factors for/causes of meniscal allograft extrusion [16, 102, 106, 109, 120]

1. Size mismatch between the affected joint surface and the allograft

2. Excessive peripheral suture tension

3. Nonanatomical placement of the allograft

4. Pre-existing osteophytes on the tibial plateau

5. Loss of fixation of the anterior and posterior horns

6. Non-repair of meniscotibial ligaments and popliteomeniscal fascicles

7. Bony inclination of the allograft

8. Position of the bone bridge

9. Fixation of the allograft

10. Recipient–donor mismatch