A Phase 3 Study to Evaluate the Long-Term Safety of ThermoProfen™ in Patients With Mild to Moderate Pain Associated With Osteoarthritis of the Knee.

Inclusion Criteria: * Patient completed a previous efficacy study of ThermoProfen. Exclusion Criteria: * Patient has a known allergy to nonsteroidal anti-inflammatory drugs (NSAIDs) (including aspirin). * Patient has a suspected hypersensitivity, allergy, or other contraindication to any compound present in the study medication or has a known sensitivity to adhesive components similar to those used in ThermoProfen (such as that found in adhesive bandages, e.g. Band-Aid®). * Patient has asthma that has been induced or made worse by the use of aspirin or any other NSAID. * Patient has a relevant history of serious gastrointestinal disease. * Patient has a defect, injury, or dermatologic disease or condition on the skin area where the study patch will be applied that may interfere with tolerability or post-application evaluations. * Patient has neurological or psychiatric disease sufficient to compromise data collection or integrity. * Patient is taking warfarin, heparin, or low molecular weight heparin. * Patient, if female, is pregnant or breastfeeding or is of childbearing potential and not practicing adequate birth control.