Exclusion criteria: patient refusal, inability to comprehend the consent form, age < 18, and > 65 years of age; contraindications to obturator nerve blockade (pre-existing neuromuscular or peripheral nerve disorder, localized infection, or bleeding disorder); allergy to opioids or local anesthetics; allergy to celecoxib or sulfa medications or nonsteroidal anti-inflammatory medications (NSAIDs); chronic opioid use (> 1 month of 60 mg morphine PO equivalents daily); and, women who are pregnant or breastfeeding.