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

Inclusion 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

Exclusion Criteria:

* 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.