Abstract
Background
While the use of computer-assisted navigation systems in prosthetic implantation is steadily increasing, its utility in reverse shoulder arthroplasty (RSA) remains unclear. The purpose of this study was to evaluate the clinical utility of an intraoperative navigation system in patients undergoing RSA.
Materials and methods
Patients undergoing navigated or standard RSA at a single institution between September 2020 and December 2021 were prospectively enrolled. Exclusion criteria included noncompliance with study procedures or humeral fracture. Outcome measures included postoperative version and inclination, range of motion (ROM), complications, and patient-reported outcome measurements (PROMs: American Shoulder and Elbow Surgeons score [ASES], Disabilities of the Arm, Shoulder, and Hand score [DASH], Simple Shoulder Test [SST], and Visual Analog Scale [VAS]) at final follow-up.
Results
The final cohort contained 16 patients with navigation and 17 with standard RSA at a mean follow-up of 16 months (range 12–18 months). Average age was 72 years (range 66–80 years), 8 male (24%) and 25 female (76%). There were no differences in demographics between groups (p > 0.05). At baseline, the navigated group had a greater proportion of Walch B1 and B2 glenoids (p = 0.04). There were no differences between groups regarding baseplate type and native/planned/postoperative glenoid version and inclination. In both groups, planned and postoperative versions were not significantly different (p = 0.76). Patients who did not have navigation demonstrated significant differences between planned and postoperative inclination (p = 0.04), while those with navigation did not (p = 0.09). PROM scores did not differ between groups at final follow-up for SST (p = 0.64), DASH (p = 0.38), ASES (p = 0.77), or VAS (p = 0.1). No difference in final ROM was found between groups (p > 0.05). Over 50% of all screws in both groups were positioned outside the second cortex (p = 0.37), albeit with no complications.
Conclusions
There were no statistically significant differences in ROM, PROMs, and satisfaction between patients receiving computer-navigated and standard RSA at a short-term follow-up. Despite more severe preoperative glenoid erosion in the navigated group, all patients were able to achieve an appropriate neutral axis postoperatively. The cost effectiveness and appropriate use of computer-navigated RSA warrant specific investigation in future studies.
Level of evidence: II, prospective cohort study.
Trial registration: 9/1/2020 to 12/31/2021.
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Data availability
All data generated or analyzed during this study are included in this published article [and its supplementary information files].
Abbreviations
- RSA:
-
Reverse shoulder arthroplasty
- PROMs:
-
Patient-reported outcome measurements
- ASES:
-
American shoulder and elbow surgeons
- DASH:
-
Disabilities of the arm, shoulder, and hand
- SST:
-
Simple shoulder test
- VAS:
-
Visual analog scale
- IR:
-
Internal rotation
- ER:
-
External rotation
- 3D:
-
Three-dimensional
- 2D:
-
Two-dimensional
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Acknowledgements
We would like to thank Exactech for making the intraoperative navigation system available to us free of charge.
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EG cooperated to the conception, design of the work, and interpretation of data, approved the submitted version, and agreed both to be personally accountable for the author's own contributions and to ensure that questions related to the accuracy or integrity of any part of the work, even ones in which the author was not personally involved, are appropriately investigated, resolved, and the resolution documented in the literature. SMP contributed to the acquisition and analysis, drafted the work or substantially, revised it AND approved the submitted version, and agreed both to be personally accountable for the author's own contributions and to ensure that questions related to the accuracy or integrity of any part of the work, even ones in which the author was not personally involved, are appropriately investigated, resolved, and the resolution documented in the literature. OP interpreted the data, approved the submitted version, and agreed both to be personally accountable for the author's own contributions and to ensure that questions related to the accuracy or integrity of any part of the work, even ones in which the author was not personally involved, are appropriately investigated, resolved, and the resolution documented in the literature. EJB. drafted the work or substantially revised it, approved the submitted version, and agreed both to be personally accountable for the author's own contributions and to ensure that questions related to the accuracy or integrity of any part of the work, even ones in which the author was not personally involved, are appropriately investigated, resolved, and the resolution documented in the literature. HHP drafted the work or substantially revised it, approved the submitted version and agreed both to be personally accountable for the author's own contributions and to ensure that questions related to the accuracy or integrity of any part of the work, even ones in which the author was not personally involved, are appropriately investigated, resolved, and the resolution documented in the literature. AR drafted the work or substantially revised it, approved the submitted version, and agreed both to be personally accountable for the author's own contributions and to ensure that questions related to the accuracy or integrity of any part of the work, even ones in which the author was not personally involved, are appropriately investigated, resolved, and the resolution documented in the literature. ADC drafted the work or substantially revised it, approved the submitted version and agreed both to be personally accountable for the author's own contributions and to ensure that questions related to the accuracy or integrity of any part of the work, even ones in which the author was not personally involved, are appropriately investigated, resolved, and the resolution documented in the literature.
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This prospective cohort investigation was reviewed and granted ethics approval by Sapienza University of Rome institutional Review Board (05/2020) and conducted in accordance with the Declaration of Helsinki. For all participants, informed consent was obtained prior to enrollment.
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Gaj, E., Pagnotta, S.M., Berlinberg, E.J. et al. Intraoperative navigation system use increases accuracy of glenoid component inclination but not functional outcomes in reverse total shoulder arthroplasty: a prospective comparative study. Arch Orthop Trauma Surg 144, 91–102 (2024). https://doi.org/10.1007/s00402-023-05038-y
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DOI: https://doi.org/10.1007/s00402-023-05038-y