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Clinical Trial Summary

The purpose of the study is to determine whether crosslinked Marathon and standard Enduron polyethylene liners show differences in survivorship due to wear-related revisions at minimum 14-year follow-up and every 5 years after.

Clinical Trial Description

Several institutions have reported very low wear rates with crosslinked polyethylene based on early and midterm clinical data. However, since revisions associated with osteolysis typically occur after 10-year follow-up, the greatest benefits of the reduced wear associated with crosslinked polyethylene are expected to be reflected in lower revision rates for wear-related complications at long-term follow-up.

While crosslinking has proven to substantially reduce polyethylene wear during the first decade in vivo, characterizing the long-term clinical performance of Marathon polyethylene remains important because crosslinking is accompanied by a reduction in the ultimate tensile strength, fatigue strength, and elongation to failure of ultra high molecular weight polyethylene. As a consequence, concerns have been expressed about the potential for the liner fracture, in vivo polyethylene oxidation or accelerated wear at long-term follow-up, the effects of femoral head roughening over time and the bioreactivity of crosslinked polyethylene debris particles. Ultimately, the best way to address these concerns is in the context of well-controlled, long-term clinical outcome studies. This study will evaluate outcome at a minimum of 14-years after surgery among the same group of patients whose outcome was previously reported at 10-year follow-up. As part of our efforts to follow patients throughout their lives to obtain long-term outcome data, we will continue to obtain routine follow-up every 5 years from the date of the patient's primary total hip arthroplasty for the duration of the patient's life or until revision of the polyethylene liner (estimated to be 25 years). Because we anticipate that the reduced incidence of wear and osteolysis will result in a lower incidence of revision surgery among the patients randomized to Marathon liners, implant revision for reasons related to wear will be our primary outcome measure at long-term follow-up. ;

Study Design

Related Conditions & MeSH terms

NCT number NCT02508428
Study type Interventional
Source Anderson Orthopaedic Research Institute
Status Enrolling by invitation
Phase N/A
Start date June 2015
Completion date December 2030

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