Background: Clinicians commonly utilize intra-articular injections to treat symptomatic primary arthritis. Steroid injections are common yet have immune-modulating effects and can alter gene expression which may delay definitive arthroplasty and further damage cartilage. Nonsteroidal anti-inflammatory injections may offer a safer profile due to their differing mechanism of action; however, there is a relative dearth of information regarding their efficacy. This noninferiority study compares the effectiveness of triamcinolone vs ketorolac in treating symptoms of moderate to advanced primary osteoarthritis of the hip and knee.
Methods: In total, 110 patients (52 hips and 58 knees) with moderate to severe radiographic primary osteoarthritis of the hip or knee were randomized in a double-blinded study to receive an ultrasound-guided intra-articular injection of ketorolac or triamcinolone. Patient-reported outcome measures were collected pre-injection and at 1 week, 1 month, and 3 months.
Results: For hips and knees, intra-articular injections with either ketorolac or triamcinolone led to statistically significant improvements in patient-reported outcome measures. The treatment effect size was largest at 1 week and decreased over time. Primary analysis of variance comparisons revealed no significant differences between ketorolac and triamcinolone. For knee injections, post hoc secondary analysis suggests slight added durability in the triamcinolone group. Adverse effects were minimal with both interventions.
Conclusion: Intra-articular ketorolac injections provide comparable improvement to triamcinolone for primary hip and knee osteoarthritis. Ketorolac is an additional low-cost option for conservative management of primary osteoarthritis, and due to its differing mechanism of action, it may not propagate additional cartilage damage or preclude from early surgical intervention if unsuccessful.
Trial Registration Number: NCT04441112.
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