The purpose of this study is to use Radiostereometric Analysis (RSA) and clinical outcome measures to evaluate early, post-operative implant stability, post-operative implant fixation, clinical performance, and in-vivo wear of the Zimmer® Continuum® Cup with vitamin E stabilized polyethylene.

Inclusion Criteria:

• Symptomatic osteoarthritis of the hip indicating surgical intervention
• Scheduled to undergo an uncemented total hip arthroplasty (THA)
• Patients between the ages of 18 and 65, inclusive
• Ability to give informed consent
• Patients will be available for follow-up for a minimum of 2 years after surgery

Exclusion Criteria:

• Patients less than 18 years of age, or older than 65 years of age.
• Post-traumatic arthritis in the affected hip
• Rheumatoid arthritis in the affected hip
• Hip dysplasia in the affected hip
• Prior arthroplasty of the affected hip
• Active or prior infection of the affected hip
• Morbid obesity (BMI > 35)
• Medical condition precluding major surgery
• Severe osteoporosis or osteopenia
• Neuromuscular impairment
• Patients with known allergy to metals
• Pregnancy
• Patients with compromised kidney function
• Patient is immuno-suppressed
• Patients that require a femoral head less than 32 mm or greater than 40mm.