Stem geometry changes initial femoral fixation stability of a revised press-fit hip prosthesis: A finite element study

Robert D. Russell, Michael H. Huo, Danieli C. Rodrigues, Victor Kosmopoulos

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

BACKGROUND: Stable femoral fixation during uncemented total hip arthroplasty is critical to allow for subsequent osseointegration of the prosthesis. Varying stem designs provide surgeons with multiple options to gain femoral fixation. OBJECTIVE: The purpose of this study was to compare the initial fixation stability of cylindrical and tapered stem implants using two different underreaming techniques (press-fit conditions) for revision total hip arthroplasty (THA). METHODS: A finite element femur model was created from three-dimensional computed tomography images simulating a trabecular bone defect commonly observed in revision THA. Two 18-mm generic femoral hip implants were modeled using the same geometry, differing only in that one had a cylindrical stem and the other had a 2 degree tapered stem. Surgery was simulated using a 0.05-mm and 0.01-mm press-fit and tested with a physiologically relevant loading protocol. RESULTS: Mean contact pressure was influenced more by the surgical technique than by the stem geometry. The 0.05-mm press-fit condition resulted in the highest contact pressures for both the cylindrical (27.35 MPa) and tapered (20.99 MPa) stems. Changing the press-fit to 0.01-mm greatly decreased the contact pressure by 79.8% and 78.5% for the cylindrical (5.53 MPa) and tapered (4.52 MPa) models, respectively. The cylindrical stem geometry consistently showed less relative micromotion at all the cross-sections sampled as compared to the tapered stem regardless of press-fit condition. CONCLUSIONS: This finite element analysis study demonstrates that tapered stem results in lower average contact pressure and greater micromotion at the implant-bone interface than a cylindrical stem geometry. More studies are needed to establish how these different stem geometries perform in such non-ideal conditions encountered in revision THA cases where less bone stock is available.

Original languageEnglish (US)
Pages (from-to)865-872
Number of pages8
JournalTechnology and Health Care
Volume24
Issue number6
DOIs
Publication statusPublished - 2016

    Fingerprint

Keywords

  • Arthroplasty
  • Finite element analysis
  • Mechanics
  • Orthopaedics
  • Total hip replacement

ASJC Scopus subject areas

  • Bioengineering
  • Biophysics
  • Information Systems
  • Biomaterials
  • Biomedical Engineering
  • Health Informatics

Cite this