Mechanical comparison of biodegradable femoral fixation devices for hamstring tendon graft – A biomechanical study in a porcine model

2009 ◽  
Vol 24 (5) ◽  
pp. 435-440 ◽  
Author(s):  
Jia-Lin Wu ◽  
Tsu-Te Yeh ◽  
Hsain-Chung Shen ◽  
Cheng-Kung Cheng ◽  
Chian-Her Lee
Keyword(s):  
Porcine Model ◽  
Hamstring Tendon ◽  
Tendon Graft ◽  
Biomechanical Study ◽  
Hamstring Tendon Graft ◽  
Femoral Fixation ◽  
Fixation Devices

The Fixation Strength of Six Hamstring Tendon Graft Fixation Devices in Anterior Cruciate Ligament Reconstruction: Part I: Femoral Site

2003 ◽  
Vol 31 (2) ◽  
pp. 174-181 ◽  
Author(s):  
Petteri Kousa ◽  
Teppo L. N. Järvinen ◽  
Mika Vihavainen ◽  
Pekka Kannus ◽  
Markku Järvinen
Keyword(s):  
Ligament Reconstruction ◽  
Cruciate Ligament ◽  
Hamstring Tendon ◽  
Tendon Graft ◽  
Fixation Strength ◽  
Single Cycle ◽  
Hamstring Tendon Graft ◽  
Fixation Devices ◽  
Load To Failure ◽  
Anterior Cruciate

Background: Strength of graft fixation is the weakest link in anterior cruciate ligament reconstruction. Hypothesis: There is no difference in initial fixation strength between different hamstring tendon graft femoral fixation devices. Study Design: Randomized experimental study. Methods: Each of six devices was used in the fixation of 10 quadrupled human semitendinosus-gracilis tendon grafts in tunnels drilled in porcine femora and tested 10 times with a single-cycle load-to-failure test at a rate of 50 mm/min and 10 times with a 1500-cycle loading test between 50 and 200 N at one cycle every 2 seconds. The specimens that survived the cyclic loading were subjected to a single-cycle load-to-failure test. Results: The Bone Mulch Screw (1112 N) was strongest in the single-cycle load-to-failure test, followed by EndoButton CL (1086 N), RigidFix (868 N), SmartScrew ACL (794 N), BioScrew (589 N), and RCI screw (546 N). It also showed the lowest residual displacement (2.2 mm) and was strongest in the single-cycle load-to-failure test after cyclic loading. Conclusions: The Bone Mulch Screw was superior to all other devices. Clinical Relevance: Caution may be warranted in employing aggressive rehabilitation after reconstruction with these devices. Preconditioning of the graft-implant complex before fixation is important.

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