Based on strict inclusion criteria, 109 patients were eligible for analysis in this study. Of these patients, 23 developed RPOA—representing an incidence of 21%.
The characteristics of patients who went on to develop RPOA in this study were: worse initial Kellgren-Lawrence grade and older age.
Future studies of larger sample size that also include outcomes of patients who did not receive intra-articular injections will be needed to establish a causal relationship between these injections and RPOA
