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Design parameters affecting initial mechanical stability of tapered, splined modular titanium stems (TSMTSs) are not well understood. Furthermore, there is considerable variability in contemporary designs. We asked if spline geometry and stem taper angle could be optimized in TSMTS to improve mechanical stability to resist axial subsidence and increase torsional stability. Initial stability was quantified with stems of varied taper angle and spline geometry implanted in a foam model replicating 2cm diaphyseal engagement. Increased taper angle and a broad spline geometry exhibited significantly greater axial stability (+21%-269%) than other design combinations. Neither taper angle nor spline geometry significantly altered initial torsional stability.

Original publication

DOI

10.1016/j.arth.2015.01.054

Type

Journal article

Journal

J arthroplasty

Publication Date

07/2015

Volume

30

Pages

1254 - 1259

Keywords

basic science, modular stem, revision, subsidence, total hip arthroplasty, Arthroplasty, Replacement, Hip, Diaphyses, Femur, Hip Prosthesis, Humans, Materials Testing, Prosthesis Design, Reoperation, Titanium