Methods: Using 3-dimensional models created from computed tomography of 19 patients with advanced
shoulder osteoarthritis, we simulated glenoid resurfacing on varying degrees of retroverted, osteoarthritic
glenoids using an in-line 3-peg glenoid component and asymmetric reaming to correct version.
Results: Glenoids with preoperative retroversion of less than 12 could always be implanted with 46-mm and
52-mmglenoid components at neutral version without vault violation.Conversely, glenoids with greater than 18
of preoperative retroversion could not be implanted at neutral version due to vault violation from the pegs. The
average preoperative glenoid retroversion of patients in which a 46-mmglenoidwas implanted at neutral version
was 8.9 6.4 compared with 19.0 7.1 for those that could not be implanted at neutral (P ¼ .005).