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  • Title: Evaluation of topically administered diclofenac liposomal cream for treatment of horses with experimentally induced osteoarthritis.
    Author: Frisbie DD, McIlwraith CW, Kawcak CE, Werpy NM, Pearce GL.
    Journal: Am J Vet Res; 2009 Feb; 70(2):210-5. PubMed ID: 19231953.
    Abstract:
    OBJECTIVE: To assess the clinical, biochemical, and histologic effects of topically administered diclofenac liposomal cream (DLC) in the treatment of horses with experimentally induced osteoarthritis. ANIMALS: 24 horses. PROCEDURES: Osteoarthritis was induced arthroscopically in 1 middle carpal joint of all horses. Eight horses treated with DLC were given 7.3 g twice daily via topical application. Eight horses treated with phenylbutazone were given 2 g orally once daily. Eight control horses received no treatment. Evaluations included clinical, radiographic, magnetic resonance imaging, synovial fluid, gross, and histologic examinations as well as histochemical and biochemical analyses. RESULTS: No adverse treatment-related events were detected. Horses that were treated with DLC or phenylbutazone had significant clinical improvement of lameness, unlike the control horses. Treatment with DLC induced significant improvement in staining and total articular glycosaminoglycan content, compared with no treatment. Treatment with phenylbutazone induced significant reduction in synovial fluid prostaglandin E2 concentration, compared with DLC and no treatment. Treatment with DLC induced significantly less radial carpal bone sclerosis and overall gross cartilage erosion, compared with phenylbutazone. CONCLUSIONS AND CLINICAL RELEVANCE: Results indicated that DLC had both clinical sign-modifying and disease-modifying effects. Only clinical sign-modifying effects were detected in association with phenylbutazone administration. Treatment with DLC had significant beneficial effects, compared with phenylbutazone, and no detrimental effects. Results suggested that DLC is a viable therapeutic option for horses with osteoarthritis.
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