Prescription-grade crystalline glucosamine sulfate as an add-on therapy to conventional treatments in erosive osteoarthritis of the hand: results from a 6-month observational retrospective study

Sara Tenti, Nicola Veronese, Sara Cheleschi, Iole Seccafico, Olivier Bruyère, Jean-Yves Reginster, Antonella Fioravanti, Sara Tenti, Nicola Veronese, Sara Cheleschi, Iole Seccafico, Olivier Bruyère, Jean-Yves Reginster, Antonella Fioravanti

Abstract

Objective: To evaluate the efficacy of prescription-grade Crystalline Glucosamine Sulfate (pCGS) as an add-on treatment to conventional therapy, compared to usual therapy alone, in patients with erosive osteoarthritis of the hand (EHOA).

Methods: This 6-month retrospective case-control study included patients with concomitant knee osteoarthritis and symptomatic EHOA. Participants were stratified into two groups based on whether or not pCGS (1500 mg/day) was added to the conventional therapy (education and training in ergonomic principles, exercise and use on-demand of symptomatic drugs) for hand osteoarthritis. Patients were evaluated at baseline, after 3 and 6 months. Primary outcomes were the change from baseline to month 6 in Visual Analogue Scale (VAS) hand pain and in Functional Index for Hand Osteoarthritis (FIHOA) score. A set of secondary parameters was also evaluated.

Results: 123 patients were included as follows: 67 treated with pCGS in addition to conventional therapy (pCGS Group) and 56 with conventional therapy alone (Control Group). After 6 months a significant difference in VAS and in FIHOA score (p < 0.01 and p < 0.001, respectively) was observed in favor of pCGS Group. Similar results were found for morning stiffness duration (p < 0.05), health assessment questionnaire (p < 0.01) and physical and mental component score of 36-item short form (p < 0.05 and p < 0.001, respectively). A significant reduction of symptomatic drug consumption at 3 and 6 months was reported in the pCGS Group (p < 0.001). No serious adverse event was recorded in both groups.

Conclusions: Despite all the limitations inherent to an observational study, our results suggest the potential effectiveness of pCGS, when used in combination with conventional therapy in EHOA. Further randomized placebo-controlled trials are needed to confirm these positive findings.

Trial registration: ClinicalTrials.gov, http://www.

Clinicaltrials: gov , date of registration: February 2, 2022, NCT05237596. The present trial was retrospectively registered.

Keywords: Erosive hand osteoarthritis; Hand osteoarthritis; Pain; Prescription-grade crystalline glucosamine sulfate; Retrospective study; Symptomatic slow-acting drugs for osteoarthritis.

Conflict of interest statement

On behalf of all authors, the corresponding author states that there is no conflict of interest.

© 2022. The Author(s).

Figures

Fig. 1
Fig. 1
Flow diagram of the study population. OA osteoarthritis, pCGS prescription-grade crystalline glucosamine sulfate; DMARDs disease modifying anti-rheumatic drug
Fig. 2
Fig. 2
Means with standard error changes in the Visual Analogue Scale (VAS) (0–100 mm) (a), and in the Functional Index for Hand Osteoarthritis (FIHOA) score (0–30) (b), after 3 and 6 months in prescription-grade Crystalline Glucosamine sulfate (pCGS)-exposed Group and pCGS-unexposed Group. pCGS-exposed Group vs pCGS-unexposed Group: *p < 0.05; **p < 0.01; ***p < 0.001
Fig. 3
Fig. 3
Means with standard error changes in morning stiffness, measured by Visual Analogue Scale (VAS) (minutes) (a), in the Health Assessment Questionnaire (HAQ) (0–3) (b), in the Physical Component Score (PCS) of the Short-Form Survey 36 (SF-36) (c), and in the Mental Component Score (MCS) of SF-36 (d), after 3 and 6 months in prescription-grade Crystalline Glucosamine Sulfate (pCGS)-exposed Group and pCGS-unexposed Group. pCGS-exposed Group vs pCGS-unexposed Group: *p < 0.05; **p < 0.001; ***p < 0.001

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