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.
|Number of pages||7|
|Journal||Proceedings of the Institution of Mechanical Engineers, Part H - Journal of Engineering in Medicine|
|Early online date||5 Feb 2013|
|Publication status||Published - May 2013|
Holsgrove, T. P., Petheram, T., Miles, A. W., & Timperley, A. J. (2013). Distal stem features improve torsional resistance of long-stem cemented revision hip stems: An in vitro biomechanical study. Proceedings of the Institution of Mechanical Engineers, Part H - Journal of Engineering in Medicine, 227(5), 503-509. https://doi.org/10.1177/0954411913476616