Long-term outcomes of arthroscopic Bankart repair and Hill-Sachs remplissage for bipolar bone defects

Purpose To evaluate long-term results after arthroscopic Bankart repair and Hill-Sachs remplissage (BHSR) in bipolar bone defects with less than 20% of glenoid bone loss (GBL) and to analyse risk factors for recurrent dislocation. Methods From 2009-2012, 43 patients with recurrent anterior shoulder instability were treated with BHSR. Inclusion criteria were GBL < 20% and minimum of 4-yearfollow-up. There were 35 males and 8 females with a mean age of 29 years (range 16-53). The mean ISIS score was 3.6 (range 2-6). Patients were evaluated for recurrence, range of motion and functional outcomes (Walch-Duplay and Rowe score). Post-operative MRI was performed at least 6 months after surgery to evaluate infraspinatus capsulotenodesis healing. Glenoid track was assessed retrospectively from pre-operative computed tomography. Mean follow-up was 7.3 years (range 4-11). Results At the last follow-up, good to excellent outcomes were reported in 86% of patients. Average post-operative Walch-Duplay was 87.9 (range 75-100) and ROWE 93.7 (range 70-100). Infraspinatus capsulotenodesis healing was achieved in 86%. The rate of recurrence and revision surgery was 9.3% and 13.9%, respectively. Recurrence was associated with higher ISIS score (p = 0.0191) and lower age at surgery (p = 0.0227). Four (9.3%) Hill-Sachs lesions were considered off-track. The presence of off-track Hill-Sachs was associated with higher risk of recurrence (p < 0.00001). Conclusion Arthroscopic BHSR improves shoulder instability in the setting of bipolar bone defects with less than 20% of GBL. Patient-related factors and pre-operative glenoid track should be taken into consideration to reduce the risk of recurrence.