This is a biomechanical study on anterior cruciate ligament (ACL) reconstruction. Standardized load to failure testing in bovine and human specimens was performed after pressfit fixation of a four strand porcine soft tissue graft using an autologous bone cylinder. We evaluated the influence of the relation of “bone block” to “bone tunnel” to “soft tissue graft diameter” and the influence of bone density on the primary stability. The highest pull out forces were measured for the relation of tunnel- to graft- to bone block diameter 1.16: 1: 0.95. The forces measured are positively correlated with the bone density. Regarding the primary stability, the results are rather inferior compared to the data found in the literature for other fixation techniques. The press fit fixation of soft tissue grafts with an autologous bone cylinder provides an alternative primary or additional fixation, especially with regards to the anatomic double bundle ACL reconstruction and revision surgery.
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