CNTX-4975-05 in Subjects with Moderate to Severe Osteoarthritis Knee Pain

The study evaluates the analgesic efficacy on pain with walking of a one-time knee injection for patients with moderate to severe knee osteoarthritis. CNTX-4975-05 is the investigational drug that has not been approved by the FDA. The study drug is a long-acting, non-opioid analgesic drug candidate designed to provide pain relieve. Subjects will be randomly assigned to one of two groups: study drug group, or a placebo group.

Inclusion Criteria

• Subject must have knee osteoarthritis
• Subject must be willing to complete a daily electronic diary on knee pain and stiffness
• Subject must have a BMI ≥ 45 kg/m²

Exclusion Criteria

• Subject who is breastfeeding or pregnant
• Subject who uses topical medication for knee osteoarthritis pain during the trial
• Subject with a knee replacement surgery, or a recent open surgery of the knee

Study Requirements

The Centrexion osteoarthritis research study entails a total of 12 visits to Tufts Medical Center over a period of approximately one year. Five of the visits will require blood and urine collection, and the first visit will require an X-ray of both knees. The one-time knee injection will occur after two approved screening visits.