High resorption rates following glenoid augmentation procedures do not seem to lead to higher recurrence rates or worse clinical outcomes: a systematic review and meta-analysis

• Published in: Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA Vol. 31; no. 7; pp. 2581 - 2592
• Main Authors: Rutgers, Cain, Verweij, Lukas P. E., Schuit, Alexander A., Sierevelt, Inger N., Jamaludin, Faridi S., van der Woude, Henk-Jan, van den Bekerom, Michel P. J.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.07.2023; John Wiley & Sons, Inc
• Subjects: Allografts; Arthroscopy - methods; Autografts; Bone grafts; Bone resorption; Clinical outcomes; Failure rates; Fixation; Grafting; Grafts; Heterogeneity; Humans; Inclusions; Joint Instability - surgery; Medicine; Medicine & Public Health; Meta-analysis; Nonunion; Orthopedics; Radiographs; Radiography; Recurrence; Scapula - surgery; Shoulder; Shoulder Dislocation - surgery; Shoulder Joint - surgery; Sports Medicine; Substitute bone; Systematic review; Shoulder instability; Bone grafts; Bone union; Allografts; Imaging and radiology; Shoulder injuries; Bone augmentation; Bony stabilization; Joint stabilization surgery; Sports medicine
• ISSN: 0942-2056; 1433-7347; 1433-7347
• DOI: 10.1007/s00167-022-07267-x

Purpose Bone augmentation techniques show a relatively high complication rate, which might be due to graft non-union and resorption. It is unclear which augmentation techniques demonstrate the highest amount of non-union and resorption and whether this leads to worse clinical or functional outcomes. Therefore, the aim of this review was (i) to compare non-union and resorption rates between surgical approaches, procedures, graft types, donor sites and fixation methods regarding clinical and functional outcomes and (ii) determine whether high non-union or resorption rates lead to less favorable clinical or functional outcomes. Methods The Preferred Reporting Items for Systematic Reviews and Meta-Analyses statements were followed. PubMed, EMBASE (Ovid) and Cochrane Library were searched on December 15th 2021 for studies examining bone graft non-union or resorption using radiograph or CT following glenoid augmentation to treat anterior shoulder dislocation. Results The search resulted in 103 inclusions, comprising 5,128 glenoid augmentations. When comparing pooled proportions of bony union, graft fracture rate, hardware failure rate, recurrence rate, return to sports and Rowe score, most results were similar between approaches, procedures, graft types, donor sites and fixation methods. High resorption rates were seen for allograft augmentation (74.3; 95% CI: 39.8–92.7) compared to autograft augmentation (15.5; 95% CI 10.1–23.2), but this was not associated with higher recurrence rates or worse clinical outcomes. Meta-analyses (8 studies; 494 patients) demonstrated no difference in incomplete and complete non-union rates between arthroscopic and open procedures; however, both analyses showed substantial heterogeneity. Higher partial resorption rates were observed on CT (48.0; 95% CI 43.3–52.7) compared to radiograph (14.1; 95% CI 10.9–18.1). Three studies comprising 267 shoulders demonstrated a higher rate of non-union and recurrence in smokers, whereas one study comprising 38 shoulders did not. Conclusion Non-union and resorption rates were similar among procedures, grafts and fixation methods. Higher resorption rates were observed in allografts, but this was not associated with higher recurrence rates or worse clinical outcomes. Pooling data demonstrated substantial heterogeneity and definitions varied among studies, warranting more standardized measuring. Level of evidence IV.