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

The purpose of this clinical investigation is to gather sufficient clinical and radiographic data to permit valid scientific comparisons between treatment and control group outcomes. The treatment group/device for this study is the ASR™-XL Acetabular Cup System, and the control group/device is the Pinnacle™ Cup System w/ the 28mm or 36mm ULTAMET™ metal liner. The study objective will be achieved by way of treatment group selection, treatment administration, and management of participating study Subjects.

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 litigation, medical legal or worker's compensation claims.