 The purpose of this single-center study is to evaluate the potential analgesic effects of a single oral dose 50 mg of JNJ-39439335, an investigational drug being developed for the treatment of pain in patients with chronic osteoarthritis pain of the knee. The study will also evaluate the pain treatment response assessments and methods being used in this study. Participants will also take naproxen 500 mg and placebo an inactive substance during the study. Pain assessments after taking JNJ-39439335, naproxen and placebo will be compared. 