Survival and performance of a dual tapered-wedge fully HA-coated press fit femoral stem

Ramakanth R. Yakkanti, Dylan N. Greif, Dennis J.Vanden Berge, Raymond P. Robinson

Research output: Contribution to journalArticlepeer-review

Abstract

Introduction: Fully hydroxyapatite-coated titanium alloy double-tapered stems have been successful implant designs for THA. The Novation Element Stem (Exactech, Gainesville, FL) is one of several of these implants following a modified Corail design philosophy. Although a great deal is known about the results of the Corail stem, little is known about the more recent Corail-inspired implants. The authors evaluated the clinical outcomes, radiographic findings and survival statistics of the collarless version of the Element Stem when used routinely in a diverse patient population. Methods: A retrospective review was performed for all primary THR cases from 2010 to 2018. Patient demographics and HHS/OHS/patient satisfaction scores were obtained. Radiographs were evaluated for stem subsidence, radiolucencies, and bone responses to the implant. Results: One hundred and fifty seven Element Stems were implanted with greater than 2 years of radiographic follow-up, while 105 Element Stems implanted during the study period had a survival of 5 years or more. Average HHS was 91.7 and average OHS was 44.0. 54 of 157 hips had radiolucencies, all of which included a proximal zonal radiolucency. Average subsidence was 3.33 mm; 18 hips had subsidence > 4 mm. There were 8 revisions for: aseptic loosening (4), trauma-related peri-prosthetic fractures, and early proximal–medial fractures. At 5 years, the all-cause survival rate is 92.4%, 96.2% based only on aseptic loosening and 98.1% based only on proximal medial fractures. Conclusion: Clinical outcomes using the collarless Novation Element Stem are good, but early proximal medial fracture is still a factor in patients with poor-quality bone. Proximal radiolucencies progressing to aseptic loosening post-operatively are also a concern. The 11.5% rate of subsidence is comparable to other fully HA-coated collarless stems. This study provides a thorough critical analysis of outcomes and midterm survival data of this dual tapered-wedge fully HA-coated collarless stem used routinely in a diverse patient population.

Original languageEnglish (US)
JournalArchives of Orthopaedic and Trauma Surgery
DOIs
StateAccepted/In press - 2022
Externally publishedYes

Keywords

  • Aseptic loosening
  • Cementless collarless femoral stem
  • HA coating
  • Mid-term outcomes
  • Outcomes
  • Press fit femoral stem

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

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