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

Veterinary Surgery : VS
Yonathan BuksTanya C Garcia-Nolen

Abstract

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. Ex vivo biomechanical study. Cadaveric canine femora (10 pairs). 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. Implant subsidence was greater (P = .037) for the traditional implant (4.19 mm) than the interlocking implant (0.78 mm) only after gallop cyclic loading, and cumulatively after walk, trot, and gallop cyclic loads (5.20 mm vs. 1.28 mm, P = .038). Yield and failure loads were greater (P = .029 and .002, respectively) for the interlocking stem construct (1155 N and 2337 N) than the traditional stem construct (816 N and 1405 N). 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 ...Continue Reading

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Citations

Sep 25, 2020·Veterinary and Comparative Orthopaedics and Traumatology : V.C.O.T·Natalie J WordenKei Hayashi
Aug 28, 2019·Veterinary Surgery : VS·Stephen C JonesJonathan Dyce
Jun 24, 2021·Acta Cirúrgica Brasileira·Luís Guilherme de FariaLuis Gustavo Gosuen Gonçalves Dias
Dec 28, 2021·Veterinary Surgery : VS·Lauren M MeltzerSherman O Canapp

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