Radiostereometric Analysis (RSA) of the PROFEMUR® Preserve Classic Femoral Components

Inclusion Criteria: * Subject is a candidate for primary THA for osteoarthritis * Subject is able to undergo primary THA procedure * Subject is a candidate to be implanted with the specified combination of components * Subject is willing and able to complete required study visits and assessments * Subject is willing to sign the approved Informed Consent document Exclusion Criteria: * Subject has any of the following contraindications at the time of the implantation: * Overt infection; * Distant foci of infections (which may cause hematogenous spread to the implant site); * Rapid disease progression as manifested by joint destruction or bone absorption apparent on roentgenogram; * Skeletally immature (less than 21 years of age at time of surgery); * Inadequate neuromuscular status (e.g., prior paralysis, fusion, and/or inadequate abductor strength), poor bone stock, poor skin coverage around the joint which would make the procedure unjustifiable; * Subjects 76 years of age or older * Subjects with post-traumatic arthritis in the affected hip * Subjects with rheumatoid arthritis in the affected hip * Subjects with hip dysplasia in the affected hip * Subjects with prior arthroplasty of the affected hip * Subjects that are morbidly obese (BMI \> 35) * Subjects that are immuno-suppressed * Subjects with known or tested-positive allergy to metals * Subjects currently enrolled in another clinical investigation which could affect the endpoints of this protocol * Subjects unwilling or unable to sign the Informed Consent document * Subjects with substance abuse issues * Subjects who are incarcerated or have pending incarceration