This is a multicenter, randomized, double-blind, placebo-controlled, parallel-group, Phase 3 study to evaluate the efficacy and safety of the administration of multiple doses of Oxycodone Hydrochloride plus Naltrexone Hydrochloride (a) or Oxycodone Hydrochloride plus Naltrexone Hydrochloride (b) in patients who have undergone primary, unilateral, distal first metatarsal bunionectomy with osteotomy and internal fixation.