The Effects of Interlocking a Universal Hip Cementless Stem on Implant Subsidence and Mechanical Properties of Cadaveric Canine Femora

Yonathan Buks, Kirk L. Wendelburg, Susan M Stover, Tanya C. Garcia-Nolen

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Objective: To determine if an interlocking bolt would limit subsidence of the biological fixation universal hip (BFX®) femoral stem under cyclic loading and enhance construct stiffness, yield, and failure properties. Study Design: Ex vivo biomechanical study. Animals: Cadaveric canine femora (10 pairs). Methods: Paired femora implanted with a traditional stem or an interlocking stem (constructs) were cyclically loaded at walk, trot, and gallop loads while implant and bone motions were captured using kinematic markers and high-speed video. Constructs were then loaded to failure to evaluate failure mechanical properties. Results: Implant subsidence was greater (P=037) for the traditional implant (4.19mm) than the interlocking implant (0.78mm) only after gallop cyclic loading, and cumulatively after walk, trot, and gallop cyclic loads (5.20mm vs. 1.28mm, P=038). Yield and failure loads were greater (P=029 and.002, respectively) for the interlocking stem construct (1155N and 2337N) than the traditional stem construct (816N and 1405N). Version angle change after cyclic loading was greater (P=020) for the traditional implant (3.89 degrees) than for the interlocking implant (0.16 degrees), whereas stem varus displacement at failure was greater (P=008) for the interlocking implant (1.5 degrees) than the traditional implant (0.17 degrees). Conclusion: Addition of a stabilizing bolt enhanced construct stability and limited subsidence of a BFX® femoral stem. Use of the interlocking implant may decrease postoperative subsidence. However, in vivo effects of the interlocking bolt on osseointegration, bone remodeling, and stress shielding are unknown.

Original languageEnglish (US)
Pages (from-to)155-164
Number of pages10
JournalVeterinary Surgery
Volume45
Issue number2
DOIs
StatePublished - Feb 1 2016

ASJC Scopus subject areas

  • veterinary(all)

Fingerprint Dive into the research topics of 'The Effects of Interlocking a Universal Hip Cementless Stem on Implant Subsidence and Mechanical Properties of Cadaveric Canine Femora'. Together they form a unique fingerprint.

  • Cite this