Instability Severity Index Score predicts recurrent shoulder instability after arthroscopic Bankart repair

Matthijs Y H van Blommestein; Lonneke H M Govaert; Job van der Palen; Wiebe C Verra; Rinco C T Koorevaar; Femke F Schröder; Egbert Jan D Veen

doi:10.1002/ksa.12235

Instability Severity Index Score predicts recurrent shoulder instability after arthroscopic Bankart repair

Knee Surg Sports Traumatol Arthrosc. 2024 May 8. doi: 10.1002/ksa.12235. Online ahead of print.

Authors

Matthijs Y H van Blommestein¹, Lonneke H M Govaert¹, Job van der Palen^{2

3}, Wiebe C Verra¹, Rinco C T Koorevaar⁴, Femke F Schröder^{1

5

6}, Egbert Jan D Veen¹

Affiliations

¹ Department of Orthopaedic Surgery and Traumatology, Medisch Spectrum Twente, Enschede, The Netherlands.
² Department of Epidemiology, Medisch Spectrum Twente, Enschede, The Netherlands.
³ Section Cognition, Data and Education, Faculty of Behavioral, Management and Social Sciences, University of Twente, Enschede, Netherlands.
⁴ Department of Orthopedic Surgery, Bergman Clinics, Rotterdam, The Netherlands.
⁵ Department of Biomechanical Engineering, Faculty of Engineering Technology, Technical Medical Centre, University of Twente, Enschede, The Netherlands.
⁶ Medical 3D Lab, Medisch Spectrum Twente, Enschede, The Netherlands.

PMID: 38720406
DOI: 10.1002/ksa.12235

Abstract

Purpose: The Instability Severity Index (ISI) Score was developed to preoperatively assess the risk of recurrent shoulder instability after an arthroscopic Bankart repair. This study aims to validate the use of ISI Score for predicting the risk of recurrence after an arthroscopic Bankart repair in a heterogeneous population and proposes an appropriate cut-off point for treating patients with an arthroscopic Bankart repair or otherwise.

Methods: This study analysed 99 shoulders after a traumatic dislocation that underwent arthroscopic Bankart repair with at least 3 years follow-up. Patients were divided into subcategories based on their respective ISI Score. Recurrence includes either a postoperative dislocation or perceived instability.

Results: The overall recurrence rate was found to be 26.3%. A significant correlation was identified between ISI Score and the recurrence rate (odds ratio [OR]: 1.545, 95% confidence interval [CI]: 1.231-1.939, p < 0.001). Furthermore, ISI Score 4-6 (OR: 4.498, 95% CI: 1.866-10.842, p < 0.001) and ISI Score > 6 (OR: 7.076, 95% CI: 2.393-20.924, p < 0.001) both had a significantly higher risk of recurrence compared to ISI Score 0-3. In ISI Score subcategories 0-3, 4-6 and >6, the recurrence rate was, respectively, 15.4%, 40.7% and 71.4%.

Conclusion: ISI Score has predictive value in determining the recurrence risk of shoulder instability following an arthroscopic Bankart repair in a heterogeneous population. Based on the findings of this study, we recommend using arthroscopic Bankart repair in patients with ISI Score 0-3. Clinical and shared decision-making are essential in the group with ISI Score 4-6, since the recurrence rate is significantly higher than in patients with ISI Score 0-3. Arthroscopic Bankart repair is not suitable for patients with ISI Score > 6.

Level of evidence: Level III.

Keywords: Bankart repair; arthroscopy; instability; shoulder; surgery.

Grants and funding

None