Study to Characterize the Local Duration of Exposure From FX006 in Patients With Osteoarthritis of the Knee

This study was an open-label, single administration design, conducted in male and female
patients ≥40 years of age with OA of the knee.

Patients were enrolled sequentially with 8 patients per cohort, as follows:

Cohort A: FX006 40 mg, Final Visit at Week 20 Cohort B: FX006 40 mg, Final Visit at Week 16
Cohort C: FX006 10 mg, Final Visit at Week 12 Cohort D: FX006 40 mg, Final Visit at Week 12
Cohort E: Triamcinolone acetonide immediate-release (TCA IR) 40 mg, Final Visit Week 12

Each patient was evaluated for up to 12, 16, or 20 weeks following a single IA injection
depending on the assigned cohort. Following the screening visit, safety was evaluated at 3
out-patient visits and synovial fluid was collected at Day 1 for baseline measurements and
the Final Visit for drug concentration measurements.

Key Inclusion Criteria:

- Written consent to participate in the study

- Willingness and ability to comply with the study procedures and visit schedules and
ability to follow verbal and written instructions

- Has documented diagnosis of OA of the index knee made at least 6 months prior to
Screening

- Currently meets American Collage of Rheumatology Criteria (clinical and radiological)
for OA

- Index knee pain for >15 days over the last month

- Body mass index (BMI) ≤ 40 kg/m2

- Ambulatory and in good general health

Key Exclusion Criteria:

- History of Reiter's syndrome, rheumatoid arthritis, psoriatic arthritis, ankylosing
spondylitis, arthritis associated with inflammatory bowel disease, sarcoidosis or
amyloidosis

- History of arthritides due to crystals (e.g., gout, pseudogout)

- History of infection in the index joint

- Clinical signs and symptoms of active knee infection or crystal disease of the index
knee

- Presence of surgical hardware or other foreign body in the index knee

- Unstable joint (such as a torn anterior cruciate ligament) within 12 months of
Screening

- IA corticosteroid (investigational or marketed) in any joint within 6 months of
Screening

- IA hyaluronic acid (investigational or marketed) in the index knee within 6 months of
Screening

- Oral corticosteroids (investigational or marketed) within 1 month of Screening

- Inhaled, intranasal and topical corticosteroids (investigational or marketed) within 2
weeks of Screening

- Any other IA investigational drug/biologic within 6 months of Screening

- Prior use of FX006

- Prior arthroscopic or open surgery of the index knee within 12 months of Screening

- Planned/anticipated surgery of the index knee during the study period

- Active or history of malignancy within the last 5 years, with the exception of
resected basal cell carcinoma, squamous cell carcinoma of the skin, or resected
cervical atypia or carcinoma in situ