Original articleRadiographic comparison of pegged and keeled glenoid components
Section snippets
Subjects
This study was a prospective randomized trial. The patients were not told which glenoid component design they had received.
All patients had the diagnosis of primary osteoarthritis of the glenohumeral joint. Patients were excluded from participation in this study if they had radiographic evidence of osteopenia or other metabolic bone disease. There were no other inclusion or exclusion criteria. Two patients in the keeled group and two patients in the pegged group were excluded from the study
Subjects
The study consisted of 27 men with a mean age of 67.8 years (SD, 8.1 years) and 16 women with a mean age of 69.9 years (SD, 7.2 years) at the time of arthroplasty. There were 23 keeled glenoid components implanted in 8 women and 15 men and 20 pegged glenoid components implanted in 8 women and 12 men.
There were 3 small, 6 medium, and 14 large keeled glenoid components and 1 small, 6 medium, and 13 large pegged glenoid components. All of the men but 1 had received a large-sized glenoid component;
Discussion
We found that the keeled glenoid components had a higher incidence and higher overall grade of radiographic lucency postoperatively than did the pegged glenoid components. We assumed in formulating our hypothesis that eliminating selection bias with a randomized prospective study would equalize the incidence of radiographic lucency between the keel and peg designs. This was not the case. Our results confirm previous animal, biomechanical, and retrospective studies that have reported that pegged
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