A Phase 2a, Randomized, Double-blind, Placebo- and Naproxen Controlled, Parallel-group Study to Assess the Analgesic Efficacy of ASP7962 in Patients With Pain Due to Osteoarthritis of the Knee

The purpose of the study is to evaluate the analgesic efficacy of ASP7962 relative to placebo.This study will also evaluate the efficacy of ASP7962 relative to placebo on pain on walking, function and stiffness; the time course of efficacy of ASP7962 relative to placebo; the improvement in overall patient status of ASP7962 relative to placebo as well as the safety and tolerability of ASP7962 relative to placebo.