This study is a clinical evaluation of survivorship of an acetabular cup system after total hip replacement using patient examinations and questionnaires.

The primary objective of this investigation is to evaluate survivorship at five years of the Pinnacle™ acetabular cup system in primary total hip arthroplasty.

Inclusion Criteria:

• Primary hip replacement
• Sufficient bone stock to support implant
• Signed Informed Patient Consent form

Exclusion Criteria:

• Prior renal transplant
• History of active joint sepsis
• Recent high dose of corticosteroids
• Primary or secondary carcinoma in the last 5 years
• Neurological disease
• Psychosocial disease that would limit rehabilitation
• Use of structural bone graft
• Simultaneous participation in another hip study