Holsgrove Timothy P, Petheram Timothy G, Miles Anthony W, Timperley Andrew J
Centre for Orthopaedic Biomechanics, Department of Mechanical Engineering, University of Bath, Bath, UK.
Proc Inst Mech Eng H. 2013 May;227(5):503-9. doi: 10.1177/0954411913476616. Epub 2013 Feb 5.
When proximal bone stock is compromised at revision hip arthroplasty, distal fixation is often relied upon for stability of the femoral component. In such circumstances, torsional forces can result in debonding and loosening. This study compared the torsional behaviour of a cemented, polished and featureless (plain) stem with cemented, polished stems featuring fins or flutes. The finned stem construct was found to be significantly stiffer than the fluted stem. The maximum torque of the finned and fluted stems was significantly higher than the plain stem, with no difference between the finned and fluted stems. Distal stem features may provide a more reliable and greater resistance to torque in polished, cemented revision hip stems. Finned stem features may also increase the stiffness of the construct.
在髋关节翻修术中，当近端骨量不足时，股骨假体的稳定性通常依赖于远端固定。在这种情况下，扭力可能导致脱粘和松动。本研究比较了无涂层、表面光滑且无特征（普通）的骨水泥柄与带有鳍片或凹槽的表面光滑的骨水泥柄的扭转行为。结果发现，带鳍柄结构比带槽柄明显更硬。带鳍柄和带槽柄的最大扭矩显著高于普通柄，带鳍柄和带槽柄之间无差异。在表面光滑的骨水泥型髋关节翻修柄中，柄的远端特征可能提供更可靠且更大的抗扭性。带鳍柄特征也可能增加结构的刚度。
