The purpose of this research study is to evaluate the safety and analgesic efficacy of PMI-150 (intranasal ketamine) compared to placebo in patients with acute post-operative pain following orthopedic trauma, injury, or surgery.

Patients will be randomly assigned to PMI-150 (intranasal ketamine) or placebo and will receive repeated doses and be assessed for safety and efficacy.

Inclusion Criteria:

• patient is scheduled for elective orthopedic surgery or procedure

Exclusion Criteria:

• patient has received an investigational drug or participated in a clinical trial within 30 days or 5 half-lives (whichever is longer) of entering this study