Large Glenoid Defects Treated by Multiple Bioresorbable Pinning-Assisted Bone-Grafting in Reverse Shoulder Arthroplasty

Large glenoid defects pose problems in reverse shoulder arthroplasty (RSA) 1-4 . Bone-grafting enables restoration of the glenoid, but outcomes of this procedure may be hampered by early instability, which can lead to implant malpositioning, and by graft resorption, which can lead to implant loosening 2-7 . To combat these potential complications, we utilize multiple bioresorbable pinning (MBP) during the bone-grafting process, in which as many bioresorbable pins as required are inserted from whatever aspect of the graft is appropriate until initial stability of the graft is achieved 1 . We retrospectively compared the various grafting techniques applied for various degrees of retroversion, concluding that MBP is better when retroversion is >30° 1 . Treatment decisions are made according to the degree of preoperative retroversion. The MBS technique is indicated for type-2 and type-3 glenoid deformities. This technique is not only relatively safe-as it involves only the use of bioresorbable materials-but also yields improved graft incorporation and less glenoid loosening 1 .