Multi-Center Comparative Trial of the ASR™-XL Acetabular Cup System vs. the Pinnacle™ Metal- on- Metal Total Hip System

Inclusion Criteria: * Subject is able to or capable of providing consent to participate in the clinical investigation. * Subject is between the ages of 20-75 years, inclusive. * Subject requires a cementless, primary total hip arthroplasty for non-inflammatory degenerative joint disease (NIDJD). * Subject has sufficient bone stock for the hip replacement device. * Subject is a suitable candidate for the devices specified in the clinical investigation plan and is willing to be randomized to either cup system device. Exclusion Criteria: * Subject, in the opinion of the Investigator, has an existing condition that would compromise his/her participation and follow-up in this investigation. * Subject with a known allergy to metal (e.g. jewelry). * Subject has inflammatory arthritis (e.g. rheumatoid arthritis). * Subject has active or recent joint sepsis. * Subject with marked atrophy or deformity in the upper femur. * Subject with a neuromuscular disease where the loss of musculature would affect functional outcome. * Subject, in the opinion of the Clinical Investigator, has a history of chronic renal insufficiency (e.g. dialysis). * Subject is receiving systemic steroid therapy, excluding inhalers or intra-capsular injections, within 3 months prior to surgery. * Subject with known, active metastatic or neoplastic disease. * Subject is known to be pregnant, a prisoner, mentally incompetent, and or alcohol or drug abuser. * Subject is currently involved in any personal injury li…