Lead Sponsor

Texas Orthopaedics, Sports and Rehabilitation Associates

Age

18 - 65 years

Sex

ALL

Healthy Volunteers

No

•Male or non-pregnant female between the ages of 18-65
•Patients willing and able to sign the informed consent
•Patients able to comply with follow-up requirements including self-evaluations
•Patients requiring a primary total knee replacement
•Patients with a diagnosis of osteoarthritis, traumatic arthritis, or avascular necrosis

•Revision total knee arthroplasty
•Bilateral total knee arthroplasty
•Patients with inflammatory arthritis
•Patients with a body mass index (BMI) \> 40
•Allergy to ropivacaine, bupivacaine, or other local anesthetic agents
•Current use of opioid drugs
•Patients with a history of total or unicompartmental reconstruction of the affected joint
•Patients that have had a high tibial osteotomy or femoral osteotomy
•Patients with neuromuscular or neurosensory deficiency, which would limit the ability to assess pain levels
•Patients with a systemic or metabolic disorder leading to progressive bone deterioration
•Patients that are immunologically compromised, or receiving chronic steroids (\>30 days), excluding inhalers
•Patients' bone stock is compromised by disease or infection, which cannot provide adequate support and/or fixation to the prosthesis
•Patients with knee fusion to the affected joint
•Patients with an active or suspected latent infection in or about the knee joint
•Patients that are prisoners