[Medium and long-term survival of Synergy femoral stem in cementless total hip arthroplasty].

Abstract

Introduction: hip osteoarthritis is one of the most disabling conditions affecting the quality of life in the elderly, with a current prevalence of 10%. Advanced treatment for this condition generally involves total hip arthroplasty. Recently, there has been a shift from using cemented stems to uncemented stems due to the excellent clinical and radiological outcomes achieved with the latter.

Material and methods: a retrospective review was conducted of 578 total hip arthroplasties using a tapered uncemented stem performed between 2003 and 2018. The average age of the patients was 62.92 years, with a mean follow-up of 14.03 years. Follow-up ranged from 5 to 20 years.

Results: the revision rate for any reason was 2.3%, with a polyethylene wear rate of 1.0%, a deep infection rate of 0.9%, and a dislocation rate of 0.3%. No revisions were reported for aseptic loosening. The survival rate for aseptic loosening was 100%, and the overall survival rate was 97.7%. The rate of complications that did not require revision was 5.0%, while the total complication rate was 7.2%.

Conclusion: the third generation tapered uncemented titanium stem shows excellent short- and medium-term results, with adequate osteointegration. It is expected to continue showing favorable long-term results, with aseptic loosening being the primary reason for revision.