Tapered vs Cylindrical Stem Fixation in a Model of Femoral Bone Deficiency in Revision Total Hip Arthroplasty

The Journal of Arthroplasty
Robert D RussellMichael H Huo

Abstract

Distal fixation achieved with a tapered stem design has demonstrated favorable clinical results in revision total hip arthroplasty in the setting of severe bone defects. However, stem subsidence is common with this stem design. The purpose of this study is to compare the initial fixation stability of a tapered stem design to a fully porous-coated cylindrical stem design in a model of severe femoral bone deficiency. Tapered and cylindrical stems (n = 8) were implanted into a model femur with progressively shorter segments for fixation (9, 6, or 3 cm). The stems were axially loaded, and the force to produce subsidence was recorded. Average loads to produce 150 μm of displacement with a 3-cm segment were higher for the tapered stem (393 N vs 221 N, P < .01). No difference was observed in the 6- or 9-cm models. Average loads to produce failure (>4-mm subsidence) were also higher for tapered stems with a 3-cm segment (1574 N vs 500 N, P < .0001). A regression analysis determined the minimum segment length of 1.5-2.5 cm to obtain stable fixation with a tapered stem design (R(2) = 0.78, P < .001). Tapered stems required higher loads to produce subsidence than cylindrical stems in a revision THA model. Revision tapered stems require a ...Continue Reading

References

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Sep 6, 2012·Clinical Orthopaedics and Related Research·Andrew P Van HouwelingenDonald S Garbuz
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Jul 13, 2013·Clinical Orthopaedics and Related Research·Matthew W TetreaultCraig J Della Valle
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Jul 24, 2014·Clinical Orthopaedics and Related Research·Nicholas M BrownScott Sporer

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Citations

Mar 18, 2016·Journal of the Mechanical Behavior of Biomedical Materials·Nathan T EvansKen Gall
Aug 25, 2011·Journal of Biomaterials Applications·Ji-Hoon JoYoung-Hag Koh
Aug 3, 2020·The Journal of Bone and Joint Surgery. American Volume·Michael M KheirAntonia F Chen
Jul 3, 2017·Musculoskeletal Surgery·Luca CavagnaroLamberto Felli
Nov 12, 2018·Archives of Orthopaedic and Trauma Surgery·Bernd FinkDamian Oremek
Jul 1, 2020·BMC Musculoskeletal Disorders·Yu ZhangShuo Feng

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