Arthroscopic selective approach to dynamic posterior shoulder instability: Long-term follow-up insights.

Aims: Evaluate outcomes of arthroscopic capsulolabral repair in patients with structural dynamic posterior instability (Moroder classification B2), analyzing factors associated with inferior clinical outcomes or recurrence. The primary hypothesis is that this surgical approach in patients without static structural changes such as excessive glenoid retroversion or dysplastic glenoids will result in satisfactory clinical outcomes and low failure rates.

Methods: Observational retrospective analysis in patients diagnosed with posterior structural dynamic instability who underwent arthroscopic capsulolabral repair. Demographic, clinical and radiologic characteristics were registered as well as patient reported outcomes, satisfaction, complications and failure with a minimum 2-year follow-up. Association between these outcomes and preoperative factors was investigated.

Results: 21 patients were included, with an average age of 38.1 years (range 27-51) and a mean follow-up of 68.7 months (range 24-127). At final follow-up the degree of instability was 0 in 19 (90.5%) patients. Overall outcome assessment demonstrated a mean SSV of 82.3 (±15.2), mean WOSI score of 460.1 (±471) and a mean 91.5 (±13) ROWE score. Furthermore, a significant portion of patients returned to sport 71.4% at any level and 57.1% at previous level, and 71.4% reported satisfaction with treatment, while 5 patients (23.8%) had criteria for failure.

Conclusion: Arthroscopic capsulolabral repair in selected patients with type B2 posterior shoulder instability without static posterior findings yielded satisfactory clinical outcomes and low failure rates.