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- Title
A comparison of three adjustable cortical button ACL fixation devices.
- Authors
Pasquali, Meghan; Plante, Matthew; Monchik, Keith; Spenciner, David; Plante, Matthew J; Monchik, Keith O; Spenciner, David B
- Abstract
<bold>Purpose: </bold>Adjustable cortical fixation has gained popularity recently for ACL reconstruction; however, one concern with these types of devices is the potential for laxity occurring post-operatively. An indicator of clinical laxity is cyclic displacement during bench-top mechanical testing. The hypothesis was that the cyclic displacement and maximum strength of different adjustable buttons currently on the market would vary depending on their mechanism of fixation.<bold>Methods: </bold>Three devices were studied: Biomet's ToggleLoc with ZipLoop Technology (ZL), Arthrex's TightRope RT (TR), and DePuy Mitek's RIGIDLOOP Adjustable (RLA). Each was tested in isolation on a servohydraulic test machine. The implants were pre-conditioned from 5 to 67 N for 10 cycles and then tested from 50 to 250 N for 1000 cycles at 1 Hz. Following cyclic loading, a load to failure test was conducted at a rate of 20 mm/min. Total displacement was calculated from the 1st to the 1000th cycle, and ultimate strength and failure mode were recorded.<bold>Results: </bold>Results showed that the RLA had significantly lower displacement versus both the TR (p = 0.012) and the ZL (p < 0.001). The TR also showed significantly lower displacement than the ZL (p < 0.001). The RLA and the ZL were both significantly stronger than the TR (p < 0.001).<bold>Conclusions: </bold>Both the RLA and TR showed clinically acceptable amounts of cyclic displacement and maximum strength. The clinical relevance of this study is that cyclic displacement results from bench-top tests may correlate with post-operative laxity, which ideally should be kept to a minimum.
- Subjects
ANTERIOR cruciate ligament; JOINT hypermobility; TIBIA physiology; TISSUE fixation (Histology); GRAFT versus host reaction; ANTERIOR cruciate ligament surgery; FEMUR surgery; LIGAMENT surgery; COMPARATIVE studies; INTERNAL fixation in fractures; KINEMATICS; RESEARCH methodology; MEDICAL cooperation; RESEARCH; EVALUATION research
- Publication
Knee Surgery, Sports Traumatology, Arthroscopy, 2017, Vol 25, Issue 5, p1613
- ISSN
0942-2056
- Publication type
journal article
- DOI
10.1007/s00167-015-3711-8