Midterm Follow-up of Divergent Peg Glenoid Components in Total Shoulder Arthroplasty


Glenoid component aseptic loosening is the most common source of total shoulder arthroplasty (TSA) revision. Divergent pegged glenoids may improve fixation. Thirty-four patients underwent divergent peg TSA. Data were reviewed for component loosening. Failure was defined as the need for revision after loosening. The last postoperative radiographs were graded on a Lazarus glenoid lucency scale. Mean follow-up was 5.6 years š 2.44 (range, 2–10 years). Radiolucency around one or fewer pegs was noted in 14/20 patients. Six glenoids had complete radiolucency around two pegs; one shoulder had gross loosening. No secondary surgery was performed. Improvements were seen in active elevation and internal rotation. The mean Shoulder Pain and Disability Index (SPADI) score decreased by 48.1 points (p D .039). Shoulder elevation, internal rotation, and SPADI scores significantly improved at final follow-up. No patients underwent revision for glenoid loosening. There were, however, a significant number of patients with radiolucency around two pegs. (Journal of Surgical Orthopaedic Advances 27(1):6–9, 2018)
Key words: divergent peg, glenoid component, loosening, revision, total shoulder arthroplasty

Thomas W. Wright, MD; Tony L. Bryant, MD; Christopher G. Stevens, MD; Brett C. Bentley, MD; and Kevin W. Farmer, MD