Spartan Stem, World Cup and World Liner Post Market Clinical Follow-up Study

Inclusion Criteria:

• patient requires unilateral primary total hip arthroplasty due to non-inflammatorydegenerative joint disease (e.g., osteoarthritis, traumatic arthritis, avascularnecrosis, dysplasia/DDH)
• patient must be a candidate for use of the products studied, as determined jointly bythe surgeon and patient.
• male and non-pregnant female patients aged 18-75
• patients who understand the conditions of the clinical evaluation and are willing toparticipate for the length of the prescribed follow-up.

Exclusion Criteria:

• patient has active infection or sepsis(treated or untreated) enough to compromiseimplant stability or postoperative recovery
• patient is a female of child-bearing age and not taking and not taking contraceptivepills
• patient has inadequate bone stock to support the device (e.g. severe osteopenia,family history of severe osteoporosis or osteopenia)
• patient has a known or suspected metal sensitivity
• patient is immuno-suppressed with disease such as AIDS or is receiving high dose ofcortico-steroids.
• patient has an emotional or neurological condition that would pre-empt their abilityor unwillingness to participate in the clinical evaluation including mental illness,mental retardation or drug abuse
• patient is severely overweight with a BMI>40.