Pierson Jeffery L, Small Scott R, Rodriguez Jose A, Kang Michael N, Glassman Andrew H
Joint Replacement Surgeons of Indiana Foundation, Inc., Mooresville, Indiana.
Lenox Hill Hospital, New York, New York.
J Arthroplasty. 2015 Jul;30(7):1254-9. doi: 10.1016/j.arth.2015.01.054. Epub 2015 Feb 7.
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.
影响锥形花键模块化钛柄（TSMTS）初始机械稳定性的设计参数尚未得到充分理解。此外，当代设计存在相当大的变异性。我们探讨了TSMTS的花键几何形状和柄部锥角是否可以优化，以提高机械稳定性，抵抗轴向下沉并增加扭转稳定性。通过将不同锥角和花键几何形状的柄植入模拟2厘米骨干接合的泡沫模型中，对初始稳定性进行了量化。与其他设计组合相比，增加锥角和采用宽花键几何形状表现出显著更高的轴向稳定性（提高21%-269%）。锥角和花键几何形状均未显著改变初始扭转稳定性。
