These authors suggest that metal-backed glenoids (MBG) have been devised to problems of glenoid component loosening and failure.
They compared articles comparing rates of complications and revision surgeries between cemented polyethylene glenoid (PEG articles=35) and three examples of modern MBG (articles=10).
The mean duration of follow-up was greater for the PEG group (73.1 (12–211) months and 56.1 (24–100) months for the MBG.
Overall, the rate of the radiolucent lines was 354/1302 (27%) for the PEG group and 47/282 (17%) for the MBG group.
The loosening rates were 465/3185 (15%) and 22/449 (5%), and the failure rate was 189/3316 (6%) and 11/457 (2%), for PEG and MBG, respectively.
The results of < 36-month and 36–72-month subgroups showed lower rates of radiolucency and loosening in the cemented PEG group.
In the > 72-month subgroup, MBG was better in terms of loosening and failure rates
Comment: This article attempts to compare studies reporting all-poly glenoids with those studies reporting metal backed glenoids. Such an analysis of studies is complicated in contrast to the study of individual patients performed by the Australian Orthopedic Association (see this link), which demonstrates higher rates of revision for metal backed glenoid components.
The 10 year revision rate for all-poly glenoids with cross linked polyethylene was less than 5% across the population of individual patients.
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