Study was closed mainly because the surgeons participating no longer had the infrastructure to support the research and weren't following their subjects

This is a multi-centre, prospective post marketing surveillance study to assess mid-term performance of the Mpact cup in subjects requiring primary total hip arthroplasty.

Inclusion Criteria:

• Patients who are willing and able to provide written informed consent for participation in the study. Written informed consent must be obtained prior to the patient's surgery.
• Those presenting with disease that meets the indications for use for Medacta USA implants defined by this study (on-label use).
• Patients must be willing to comply with the pre and post-operative evaluation schedule.

Exclusion Criteria:

• Those with one or more medical conditions identified as a contraindication defined by the labeling on any Medacta implants used in this study.

primary total hip arthroplasty