The mechanical behavior of human femurs has been described in the literature with regard to torsion and tension but only as independent measurements. However, in this study, human femurs were subjected to torsion to determine if a simultaneous axial tensile load was generated. Fresh frozen human femurs were harvested and stripped of soft tissue. Each femur was mounted rigidly in a specially designed test jig and remained at a fixed axial length during all experiments. Femurs were subjected to external and internal rotation applied at a constant angulation rate of 0.1 deg/s to a maximum torque of . Applied torque and generated axial tension were monitored simultaneously. Outcome measurements were extracted from torsion-versus-tension graphs. There was a strong relationship between applied torsion and the resulting tension for external rotation tests (torsion/tension , , ), internal rotation tests (torsion/tension , , ), left femurs (torsion/tension , , ), and right femurs (torsion/tension , , ). No statistically significant differences were found for external versus internal rotation groups or for left versus right femurs when comparing torsion/tension ratios or values . A strongly coupled linear relationship between torsion and tension for human femurs was exhibited. This suggests an interplay between these two factors during activities of daily living and injury processes.
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January 2011
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Biomechanical Measurements of Torsion-Tension Coupling in Human Cadaveric Femurs
Rad Zdero,
Rad Zdero
Martin Orthopaedic Biomechanics Laboratory, Shuter Wing (Room 5-066),
e-mail: zderor@smh.ca
St. Michael’s Hospital
, 30 Bond Street, Toronto, ON, M5B 1W8, Canada; Department of Mechanical and Industrial Engineering, Ryerson University
, Toronto, ON, M5B 2K3, Canada
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Alison J. McConnell,
Alison J. McConnell
Medtronic International Trading Sàrl
, Tolochenaz CH-1131, Switzerland
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Christopher Peskun,
Christopher Peskun
Department of Surgery, Faculty of Medicine,
University of Toronto
, Toronto, ON, M5S 1A8, Canada
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Khalid A. Syed,
Khalid A. Syed
Division of Orthopaedic Surgery,
Toronto Western Hospital
, Toronto, ON, M5T 2S8, Canada
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Emil H. Schemitsch
Emil H. Schemitsch
Martin Orthopaedic Biomechanics Laboratory,
St. Michael’s Hospital
, Toronto, ON, M5B 1W8, Canada; Department of Surgery, Faculty of Medicine, University of Toronto
, Toronto, ON, M5S 1A8, Canada
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Rad Zdero
Martin Orthopaedic Biomechanics Laboratory, Shuter Wing (Room 5-066),
St. Michael’s Hospital
, 30 Bond Street, Toronto, ON, M5B 1W8, Canada; Department of Mechanical and Industrial Engineering, Ryerson University
, Toronto, ON, M5B 2K3, Canadae-mail: zderor@smh.ca
Alison J. McConnell
Medtronic International Trading Sàrl
, Tolochenaz CH-1131, Switzerland
Christopher Peskun
Department of Surgery, Faculty of Medicine,
University of Toronto
, Toronto, ON, M5S 1A8, Canada
Khalid A. Syed
Division of Orthopaedic Surgery,
Toronto Western Hospital
, Toronto, ON, M5T 2S8, Canada
Emil H. Schemitsch
Martin Orthopaedic Biomechanics Laboratory,
St. Michael’s Hospital
, Toronto, ON, M5B 1W8, Canada; Department of Surgery, Faculty of Medicine, University of Toronto
, Toronto, ON, M5S 1A8, CanadaJ Biomech Eng. Jan 2011, 133(1): 014501 (6 pages)
Published Online: December 22, 2010
Article history
Received:
September 12, 2010
Revised:
October 11, 2010
Posted:
November 2, 2010
Published:
December 22, 2010
Online:
December 22, 2010
Citation
Zdero, R., McConnell, A. J., Peskun, C., Syed, K. A., and Schemitsch, E. H. (December 22, 2010). "Biomechanical Measurements of Torsion-Tension Coupling in Human Cadaveric Femurs." ASME. J Biomech Eng. January 2011; 133(1): 014501. https://doi.org/10.1115/1.4002937
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