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Research project: Bromelain as an adjunctive treatment for moderate-to-severe osteoarthritis of the knee: a randomized placebo-controlled pilot study - Dormant - Dormant

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Osteoarthritis of the knee is the most prevalent joint disorder. Previous studiessuggest that bromelain, a pineapple extract, may be a safer alternative/adjunctive treatment for knee osteoarthritis than current conventional treatment.


To assess the efficacy of bromelain in treating To assess the efficacy of bromelain in treating osteoarthritis of the knee of the knee. Design: Randomized, double-blind placebo controlled trial.


Subjects (n¼47) with a confirmed diagnosis of moderate to severe knee OA were randomized to 12 weeks of bromelain 800 mg/day or placebo, with a 4-week follow-up. Knee (pain, stiffness and function) and quality-of-life symptoms were reported monthly in the WOMAC and SF36 questionnaires, respectively. Adverse events were also recorded. The primary outcome measure was the change in total WOMAC score from baseline to the end of treatment at week 12.
Longitudinal models were used to evaluate outcome.



Thirty-one patients completed the trial (14 bromelain, 17 placebo). No statistically significant differences were observed between groups for the primary outcome (coefficient 11.16, p¼0.27, 95%CI 8.86 to 31.18), nor the WOMAC subscales
or SF36. Both treatment groups showed clinically relevant improvement in the WOMAC disability subscale only. Adverse events were generally mild in nature.



 This study suggests that bromelain is not efficacious as an adjunctive treatment of moderate to severe OA, but its limitations support the need for a follow-up study.


Project team

Dr Sarah Brien (PI), George Lewith, Professor, Primary Care, Medicine

Related research groups

Complex Healthcare Processes

Key Publications

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