Study of Flavocoxid (Limbrel) vs Naproxen in Subjects With Mod-Severe Osteoarthritis of the Knee

This will be a randomized, double blind, placebo controlled, parallel group, multi-center
study in subjects with moderate-severe OA. Subjects will be randomized to receive flavocoxid
250 mg bid, flavocoxid 500 mg bid, naproxen 500 mg bid or placebo in a 2:2:2:1 ratio.
Subjects will take study materials twice daily for twelve (12) weeks. After the 12 week
visit subjects in the placebo arm will be re-randomized to the two flavocoxid arms. All
subjects will then continue on the study for an additional 12 weeks.

Subjects will keep a diary noting date of onset of symptom change (better or worse), adverse
events and cost of all aspects of medical care related directly or indirectly to
osteoarthritis.

Laboratory studies for inflammatory markers will be drawn and archived at baseline and at
the 12 week visit. In addition, a subgroup of subjects will have arthrocenteses performed at
baseline and the 12 week visit and the synovial fluid archived for study of intra-articular
inflammatory markers.

Inclusion Criteria:

- OA of the Knee

- K-L Grade 2-3

- Positive response to NSAIDS

Exclusion Criteria:

- K-L grade 1 0r 4 OA of the knee

- History of GI Bleed within past 5 years

- Chronic bleeding disorder