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

Eligibility Criteria

• * patient requires unilateral primary total hip arthroplasty due to non-inflammatory degenerative joint disease (e.g., osteoarthritis, traumatic arthritis, avascular necrosis, dysplasia/DDH)
• * patient must be a candidate for use of the products studied, as determined jointly by the surgeon and patient.
• * male and non-pregnant female patients aged 18-75
• * patients who understand the conditions of the clinical evaluation and are willing to participate for the length of the prescribed follow-up.
• * patient has active infection or sepsis(treated or untreated) enough to compromise implant stability or postoperative recovery
• * patient is a female of child-bearing age and not taking and not taking contraceptive pills
• * 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 of cortico-steroids.
• * patient has an emotional or neurological condition that would pre-empt their ability or unwillingness to participate in the clinical evaluation including mental illness, mental retardation or drug abuse
• * patient is severely overweight with a BMI\>40.