TreatMent Of Knee osTeoarthritis wIth chONdroitin Sulfate - the OA MOTION Study

The goal of this phase III study is to evaluate the efficacy, safety, and tolerability of chondroitin sulfate 800 mg oral tablets versus placebo in the treatment of subjects with pain due to knee OA (osteoarthritis). The further aims of the study are to evaluate the durability of the treatment effect (up to week 36) and to gain further long-term safety and efficacy data (up to 48 weeks). The primary outcome of interest will be the effect of chondroitin sulfate on pain in the index knee at week 24 compared to placebo. The effect of chondroitin sulfate in the index knee functionality and the patient global impression of changes at 24 weeks compared to placebo are included as key-secondary endpoints. An additional key secondary endpoint will assess the durability of the effect on pain compared to placebo at week 36. Several additional secondary endpoints are included to further support the beneficial effect of the treatment and the improvements in patient's quality of life (i.e., Western Ontario and McMaster Universities Arthritis Index -WOMAC- subscales and total scores at each study visits, changes in patient's quality of life, use of rescue medication etc.) other than the safety of the product.