A Multi-Centre Study in Patients Undergoing Total Hip Arthroplasty With the Smith+Nephew CATALYSTEM™ Primary Hip System

This study is a multi-center, prospective, non-randomized study of subjects implanted with the CATALYSTEM™ Primary Hip System for primary Total Hip Arthroplasty (THA). Subjects will be enrolled and followed for 10 years post-operatively to assess safety and efficacy of the CATALYSTEM™ Primary Hip System. The primary objective is to assess 2-year post-operative stem survivorship of the Collared CATALYSTEM™ Hip System femoral stem with standard or high offset in primary THA procedures. Stem survivorship is defined as no aseptic revision (i.e., revision for any reason except infection) of the implanted femoral stem.