[Refixation of the meniscus with the SD meniscal staple: a comparative biomechanical study on cadaver knees]

The failure load of the SD meniscal staple was compared with the 2-0 Etibond meniscus suture in a dynamic test without isolating the meniscus.

In eight knee joint pairs, a standardized lesion of the posterior part of the medial meniscus was repaired by either three staples (7 mm) or three 2-0 Etibond sutures. After resection of the cruciate ligaments and 15 degrees external rotation, 45 degrees flexion, and 70 kg of axial loading, a tibial translation was exerted on the knee joint. The test was documented on a way force diagram, demonstrating the failure of the device at a sudden load of force.

The average load before failure of the meniscus staple was 591.2 N (540-690 N), that of the sutures 850 N (600-1350 N). We did not find any statistical correlation to age,weight, or height of the specimens. The suture migrated, but never ruptured. In two cases the suture caused a radial meniscus lesion. Failure of the staple was detachment of the inferior part in all cases, but no migration.

This test is based on the dynamic forces of the knee joint on the meniscus. Our measurements show lower failure loads of the staple compared to those of the sutures, but compared to other tests a stable method of meniscus repair.