On-the-Edge Anchor Placement May Be Protective Against Glenoid Rim Erosion After Arthroscopic Bankart Repair Compared to on-the-Face Anchor Placement.

Abstract Purpose This retrospective study aimed to compare the effects of two different anchoring placements on glenoid rim erosion after arthroscopic Bankart repair (ABR). Methods Shoulders that underwent ABR from January 2013 to July 2020 were divided into 2 groups according to anchor placement (on-the-face, group F; on-the-edge, group E). We retrospectively calculated the percent change of glenoid width (Δ) on the first postoperative computed tomography scan (CT; performed within 6 months) and second postoperative CT (performed at 6 to 12 months) relative to the width on the preoperative CT and compared percent changes between the 2 groups. Also, we investigated the influence of preoperative glenoid structures (normal, erosion, bony Bankart) and the postoperative recurrence rate. Results We examined 225 shoulders in 214 patients (group F, n=151; group E, n=74). At first CT, anchoring placement was significantly associated with postoperative decrease of glenoid width (group F, -7.6±7.9%; group E, -0.1±9.7%; p Conclusions In the early stage after ABR, on-the-edge glenoid anchor placement was associated with less glenoid rim erosion than on-the-face anchor placement.