Abstract
Purpose
The aims of the present study were to compare the biomechanical properties of tibial fixation in hamstring-graft ACL reconstruction using interference screw and a novel combination interference screw and dowel construct.
Material and Methods
We compared the fixation of 30 (2- and 4-stranded gracilis and semitendinosis tendons) in 15 fresh-frozen porcine tibiae with a biocomposite resorbable interference screw (Group 1) and a screw and dowel construct (Group 2). Each graft was subjected to load-to-failure testing (50 mm/min) to determine maximum load, displacement at failure and pullout strength.
Results
There were no significant differences between the biomechanical properties of the constructs. Multivariate analysis demonstrated that combination constructs (β = 140.20, p = 0.043), screw diameter (β = 185, p = 0.006) and 4-strand grafts (β = 51, p = 0.050) were associated with a significant increase in load at failure. Larger screw diameter was associated with increased construct stiffness (β = 20.15, p = 0.020).
Conclusion
The screw and dowel construct led to significantly increased fixation properties compared to interference screws alone in a porcine model. Increased screw diameter and utilization of 4-strand ACL grafts also led to improvement in load-to-failure of the construct. However, this is an in vitro study and additional investigations are needed to determine whether the results are reproducible in vivo.
Level of evidence
Level V; Biomechanical study.
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Abbreviations
- ACL:
-
Anterior cruciate ligament
- BMD:
-
Bone mineral density
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PL contributed to data analysis and interpretation, critical revisions, manuscript review, statistical analysis. MET was involved in data analysis and interpretation, critical revisions, manuscript review. GL and DB contributed to data acquisition. PA was involved in data acquisition, study design, data analysis and interpretation, critical revisions, manuscript review, administration, technical and material support. PS and FA contributed to study design, data analysis and interpretation, critical revisions, manuscript review, administration, technical and material support, study supervision.
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Laumonerie, P., Tibbo, M.E., Laumond, G. et al. Does a combined screw and dowel construct improve tibial fixation during anterior cruciate ligament reconstruction?. Eur J Orthop Surg Traumatol 32, 759–765 (2022). https://doi.org/10.1007/s00590-021-03049-2
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DOI: https://doi.org/10.1007/s00590-021-03049-2