Association of Low-Dose Colchicine With Incidence of Knee and Hip Replacements Exploratory Analyses From a Randomized, Controlled, Double-Blind Trial

Background: Osteoarthritis is a major contributor to pain and disability worldwide. Given that inflammation plays an important role in the development of osteoarthritis, anti-inflammatory drugs may slow disease progression. Objective: To examine whether colchicine, 0.5 mg daily, reduces incident total knee replacements (TKRs) and total hip replacements (THRs). Design: Exploratory analysis of the LoDoCo2 (Low- Dose Colchicine 2) randomized, controlled, double-blind trial. (Australian New Zealand Clinical Trials Registry: ACTRN12614000093684) Setting: 43 centers in Australia and the Netherlands. Patients: 5522 patients with chronic coronary artery disease. Intervention: Colchicine, 0.5 mg, or placebo once daily. Measurements: The primary outcome was time to first TKR or THR since randomization. All analyses were performed on an intention-to-treat basis. Results: A total of 2762 patients received colchicine and 2760 received placebo during a median follow-up of 28.6 months. During the trial, TKR or THR was performed in 68 patients (2.5%) in the colchicine group and 97 (3.5%) in the placebo group (incidence rate, 0.90 vs. 1.30 per 100 person-years; incidence rate difference, similar to 0.40 [95% CI, similar to 0.74 to similar to 0.06] per 100 personyears; hazard ratio, 0.69 [CI, 0.51 to 0.95]). In sensitivity analyses, similar results were obtained when patients with gout at baseline were excluded and when joint replacements that occurred in the first 3 and 6 months of follow-up were omitted. Limitation: LoDoCo2 was not designed to investigate the effect of colchicine in osteoarthritis of the knee or hip and did not collect information specifically on osteoarthritis. Conclusion: In this exploratory analysis of the LoDoCo2 trial, use of colchicine, 0.5 mg daily, was associated with a lower incidence of TKR and THR. Further investigation of colchicine therapy to slow disease progression in osteoarthritis is warranted.

Automated summary

This study examined the effects of daily 0.5mg colchicine on incident total knee replacements (TKRs) and total hip replacements (THRs). The results showed that patients who received colchicine had a lower incidence rate of TKR and THR, suggesting that colchicine may slow disease progression in osteoarthritis and further investigation is warranted.