53-Week Study Evaluating the Safety and Efficacy of Intra-articular Injections of TPX-100 With Mild to Severe Tibio-Femoral Osteoarthritis of the Knee

This multicenter, double-blind, placebo controlled, randomized study is designed to investigate the safety and efficacy of TPX-100 administered in 4 weekly doses of 200 mg per dose in subjects with tibio-femoral osteoarthritis. The B-score as determined by MRI analysis is the final inclusion criteria, which will be determined by MRI-based assessment. A standardized screening MRI will be obtained on otherwise eligible candidates. For enrolled subjects, the Screening MRI will serve as the Baseline MRI. Enrolled subjects will be assigned randomly to receive either TPX-100 or PBS placebo, 4 weekly IA injections administered into the target knee by fluoroscopy or ultrasound guidance. Subjects will undergo follow-up knee MRIs at Week 27 and Week 53 after the first injection. All MRIs will be read by computer-based, standardized methods, blind to treatment assignment and temporal sequence, to provide the imaging outcome measures. Subjects will complete PROs at Week 1 (Baseline), Week 27 and Week 53. A clinical safety evaluation will be performed at Week 13, and a safety tele-visit or telephone call will be performed at Week 36. Adverse events, regardless of causation, and concomitant medications will be documented at all study visits and at the Week 37 tele-visit/telephone call. Clinical laboratory assessments will be obtained at Screening, Baseline (Week 1), and Weeks 2, 3, 4; and at the in-person follow up visits. All enrolled subjects will be assigned randomly to receive either TPX-100 or PBS placebo, in 4 weekly IA injections administered into the target knee by fluoroscopy or ultrasound guidance.