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Predictive factors of adherence to an association of glucosamine sulfate, copper, and ginger extracts in patients with symptomatic osteoarthritis: a prospective open-label French noninterventional study (the PREDOA study)

Authors Conrozier T, Renevier JL, Parisaux JM, Balblanc JC

Received 9 January 2019

Accepted for publication 2 May 2019

Published 7 June 2019 Volume 2019:13 Pages 915—921


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Johnny Chen

Thierry Conrozier,1 Jean-Luc Renevier,2 Jean-Marc Parisaux,3 Jean-Charles Balblanc1

1Service de Rhumatologie, Hôpital Nord Franche-Comté, Belfort, France; 2Centre Médico Chirurgical du Mantois, Mantes-la-Joli, France; 3Institut Monégasque de Médecine et Chirurgie Sportive, Monaco, Principauté de Monaco

Background: Osteoarthritis (OA) management needs a combination of nonpharmacological and pharmacological modalities. However, as in many chronic conditions, the main concern with OA therapy is the difficulty in obtaining good medication compliance over a long period. The PREDOA study aimed to investigate the predictive factors of adherence to treatment in patients with OA treated with glucosamine sulfate (GS)–copper sulfate–ginger root (GCu), a symptomatic slow-acting drug for OA.
Methods: Ambulatory patients with a clinical diagnosis of OA were included in a prospective (6 months) multicenter open-label observational study. All patients received two capsules of GS-GCu once daily for 6 months. Demographics, disease features (OA location, symptom duration, concomitant therapies, comorbidities), and patient self-assessment of pain (0–10) were obtained at baseline. At month 6, the investigator collected patient self-assessments of treatment observance, reasons for nonadherence, pain scores, patient perceptions of treatment efficacy, changes in analgesic intake, and occurrence of adverse events. Predictors of observance were studied in univariate and multivariate analyses.
Results: A total of 2,030 patients were included in the study. At baseline, the average pain score was 6.4±1.7. Observance was good in 80% of patients. It was weaker in active than retired patients (P=0.005) in patients not taking concomitant treatment (P=0.008) or who had never been treated for OA (P=0.001). Observance was correlated with pain decrease (P<0.0001) and with lack of adverse effects (P<0.001). Age, sex, pain level at baseline, OA location, and number of painful joints were not related to treatment compliance.
Conclusion: Medication compliance with GS-GCu depends both on the safety–efficacy balance and several patient related-factors. To improve adherence, detailed information about therapeutic objectives is necessary in active patients who do not get any other medications and for whom it is their first treatment for OA.
Clinical trial identifier: CCTIRS 14-371 B.

Keywords: compliance, symptomatic slow acting drug for osteoarthritis (SYSADOAs), pain, knee OA, hip OA, hand OA

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