A biomechanical comparison of steel screws versus PLLA and magnesium screws for the Latarjet procedure
- \(\bf Introduction\) The fixation of the coracoid process onto the glenoid is an important step of the Latarjet procedure, and implant-associated complications are a relevant and severe problem. This study compares the fixation strength and failure mode of two biodegradable materials with stainless-steel screws. \(\bf Methods\) 24 Fresh-frozen cadaveric scapulae were divided into three groups of equal size and received a coracoid transfer. Cadavers were matched according to their bone mineral density (BMD). In group 1, small-fragment screws made of stainless steel were used. In the second group, magnesium screws were used, and in the third group, screws consisted of polylactic acid (PLLA). A continuously increasing sinusoidal cyclic compression force was applied until failure occurred, which was defined as graft displacement relative to its initial position of more than 5 mm. \(\bf Results\) At 5-mm displacement, the axial force values showed a mean of 374 \(\pm\) 92 N (range 219–479 N) in group 1 (steel). The force values in group 2 (magnesium) had a mean of 299 \(\pm\) 57 N (range 190–357 N). In group 3 (PLLA), failure occurred at 231 \(\pm\) 83 N (range 109–355 N). The difference between group 1 (steel) and group 2 (magnesium) was not statistically significant (\(\it P\) = 0.212), while the difference between group 1 (steel) and group 3 (PLLA) was significant (\(\it P\) = 0.005). \(\bf Conclusion\) Stainless-Steel screws showed the highest stability. However, all three screw types showed axial force values of more than 200 N. Stainless steel screws and PLLA screws showed screw cut-out as the most common failure mode, while magnesium screws showed screw breakage in the majority of cases. \(\bf Evidence\) Controlled laboratory study.
Author: | Maik-Benjamin BockmannORCiDGND, E. Jaeger, Lukas DanklGND, Wolfgang NebelungGND, Sören FreyGND, Werner SchmölzORCiDGND, Tobias SchulteGND |
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URN: | urn:nbn:de:hbz:294-98136 |
DOI: | https://doi.org/10.1007/s00402-021-03898-w |
Parent Title (English): | Archives of orthopaedic and trauma surgery |
Publisher: | Springer |
Place of publication: | Berlin |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2023/04/12 |
Date of first Publication: | 2021/04/30 |
Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
Tag: | Biodegradable; Coracoid process; Fixation; Glenoid deficit; Latarjet procedure; Shoulder instability |
Volume: | 142 |
First Page: | 1091 |
Last Page: | 1098 |
Note: | Dieser Beitrag ist auf Grund des DEAL-Springer-Vertrages frei zugänglich. |
Institutes/Facilities: | St. Josef-Hospital Bochum, Orthopädische Klinik |
Dewey Decimal Classification: | Technik, Medizin, angewandte Wissenschaften / Medizin, Gesundheit |
open_access (DINI-Set): | open_access |
Licence (English): | Creative Commons - CC BY 4.0 - Attribution 4.0 International |