Allergy to study medications or local anesthetics

History of drug or alcohol abuse

Patients with chronic pain on slow-release preparations of opioid (\>30mg morphine equivalent per day)

Patients with rheumatoid arthritis

Patients with psychiatric disorders

Patients unable or unwilling to use Patient Controlled Analgesia (PCA).

Diabetic patients or those with impaired renal function (Creatinine \> 55)

Obese patients (i.e. BMI \> 40).

Does Optimal Control of Pre-operative Chronic and Acute Pain Predict Improved Function After Orthopedic Surgery?