Abstract
Purpose
To compare bioabsorbable screw (BS) against metal screw (MS) primarily on adverse effects and secondarily on clinical outcomes after single-bundle primary anterior cruciate ligament reconstruction.
Methods
Electronic searches were performed using search strategies meeting the mentioned purposes. Retrieved articles were selected for randomised controlled trials (RCTs) reporting at least 1-year follow-up. Potential studies were selected under inclusion and exclusion criteria. Risk of biases and data extraction was completed by two review authors. Discrepancies were resolved through discussion. Mean difference and risk ratio with 95 % confidence interval (CI) were used for continuous and binary outcomes, respectively. Heterogeneity was assessed using I 2. Pooled treatment effects with 95 % CI were estimated using the fixed- or random-effect model where appropriate.
Results
Eleven RCTs with 878 randomly allocated patients were included, and 711 patients (81 %) with eligible follow-up time up to 8 years were analysed. Comparing with the MS group, BS group using medial hamstring graft showed evidence of larger tunnel widening on the femoral side measured from radiographs or magnetic resonance imaging, though data could not be pooled because diverse measurement methods had been used. Significantly higher rates of effusion and screw breakage, and fewer cases of complete tunnel healing were reported in the BS group. Nevertheless, functional and clinical results were not deteriorated by the presence of these adverse effects for both short- and longer-term follow-ups.
Conclusion
This is the first systematic review focusing on adverse effects of the BS, such as larger tunnel widening and higher rates of other complications. With these effects, routine use of the BS should be balanced with the advantages claimed. Cost-effectiveness is another issue, and well-designed RCTs are needed to better validate the implication.
Level of evidence
Systematic review of randomised controlled therapeutic studies, Level II.
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Acknowledgments
We would like to thank MS Busagorn Ussahgij, the librarian of the Faculty of Medicine, Khon Kaen University, for helping us in search strategy and retrieving literatures. We also thank the Cochrane Collaboration following the use of the Cochrane software for systematic reviews, Review Manager, as non-Cochrane mode as well as Thai Cochrane Network and Thailand Research Fund (Senior Research Scholar Programme) for assistance in methodology.
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The authors declare that they have no conflict of interest.
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Laupattarakasem, P., Laopaiboon, M., Kosuwon, W. et al. Meta-analysis comparing bioabsorbable versus metal interference screw for adverse and clinical outcomes in anterior cruciate ligament reconstruction. Knee Surg Sports Traumatol Arthrosc 22, 142–153 (2014). https://doi.org/10.1007/s00167-012-2340-8
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DOI: https://doi.org/10.1007/s00167-012-2340-8