Effects of an Herbal Topical Cream on Osteoarthritis Symptoms, Biomarkers, and Disease Progression in the Knee

General Procedure: Subjects will be screened for: a history of knee pain and surgery by questionnaire; kidney disease as determined by blood creatinine levels; knee diameter less than 17cm and body diameter less than 60 cm due to the physical constraints of the MRI. Prior X-rays or MRIs will be examined to evaluate the subject's level of OA. X-rays and MRIs that are older than 2 years, cannot be used and these potential subjects will receive one set of 2 knee x-rays prior to enrollment. If they qualify and wish to enroll, they will be matched on age, sex and degree of OA and assigned by a 3rd party investigator to either a placebo group or active treatment group. Subjects will be asked to complete baseline questionnaires, functional tests, and have blood draws and MRI screenings before starting their treatment. Enrolled subjects will apply 2.5 grams of active or placebo cream 3 times per day to the skin over the affected knee for 12 weeks. Further measurements will be taken periodically throughout the course of the study, as detailed below.

MRI: Subjects will receive MRI scans of the affected knee 3 times: at enrollment, 12 weeks, and 15 months. The MRI scan sessions will take place at the Lucas Center for MRI at Stanford University. In preparation for the MRI scan, subjects will be required to fill out a standard MRI screening form to ensure that there are no conditions that could interfere with the MRI imaging or that could make scanning in any way hazardous. During the sessions, subjects will lie on the scanner table on their backs with their legs straight. We will scan one knee. The time for this scan will be approximately 1 hour. This entire session will take approximately 1 and 1/2 hours, including setup time.

Subjects may be asked to receive a small dose of intravenous gadolinium contrast agent, administered by Dr. Gold. This is to improve the evaluation of the articular cartilage.

Questionnaires: Subjects will receive physical activity, pain and function questionnaires at enrollment, 4 weeks, 8 weeks, 12 weeks, 14 weeks, 16 weeks, 20 weeks, 6 months, 9 months, 12 months, and 15 months. They will also keep a log of use of other pain medicine, such as aspirin.

Blood/Urine Samples: A small amount of blood (2 tablespoons or 30 ml) will be drawn and urine collected up to 11 times throughout the investigation to study blood markers of cartilage breakdown (COMP, CTX2, Glc-Gal-PYD) and synthesis (PIIANP) as well as inflammation (HA, CRP) and joint vascularity (TNF-alpha, IL-6, osteocalcin). Blood creatinine levels will be tested at baseline only.