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Reverse total shoulder arthroplasty baseplate stability with locking vs. non-locking peripheral screws
Elise J Martin1, Thomas R Duquin2, Mark T Ehrensberger1
1Department of Biomedical Engineering, State University of New York at Buffalo, Buffalo, NY, USA; Department of Orthopaedic Surgery, State University of New York at Buffalo, Buffalo, NY, USA.
Clinical Biomechanics (Bristol, Avon)
|May 31, 2022
Summary
Locking versus non-locking screws show no significant difference in glenoid baseplate stability. This biomechanical study found similar migration and micromotion for both fixation types in augmented and non-augmented cases.
Area of Science:
- Orthopedic biomechanics
- Biomaterials science
- Surgical implant technology
Background:
- Limited biomechanical data exists for commercially available glenosphere baseplate fixation options.
- This study addresses the lack of evidence comparing locking and non-locking peripheral screw fixation for glenoid baseplates.
Purpose of the Study:
- To biomechanically compare the fixation stability of reverse total shoulder glenoid baseplates using locking versus non-locking peripheral screws.
- To evaluate the influence of screw type on baseplate migration and micromotion in both non-augmented and augmented scenarios.
Main Methods:
- A biomechanical comparison of glenoid baseplate fixation using locking and non-locking peripheral screws.
- Testing was performed on both non-augmented and augmented baseplates implanted in polyurethane foam, subjected to cyclic loading (0-750 N at 60° for 5000 cycles).
- Baseplate displacement was quantified using a 3D Digital Image Correlation System.
Main Results:
- No significant differences in baseplate migration were observed between locking and non-locking screws for either non-augmented (5.66 ± 2.29 μm vs. 3.71 ± 1.23 μm) or augmented (15.43 ± 8.49 μm vs. 12.46 ± 3.24 μm) cases.
- Similarly, no significant differences in micromotion were found between locking and non-locking screws for non-augmented (10.79 ± 5.22 μm vs. 10.16 ± 7.61 μm) or augmented (55.03 ± 10.13 μm vs. 54.84 ± 10.65 μm) cases.
- Statistical analysis (p-values) confirmed the lack of significant difference in both migration and micromotion for all tested configurations.
Conclusions:
- The choice between locking and non-locking peripheral screws does not significantly impact the overall stability of a glenoid baseplate.
- These findings apply to both non-augmented (no defect) and augmented (bone defect) baseplate scenarios.
- The biomechanical stability of glenoid baseplates is not significantly influenced by the locking status of peripheral screws.
