Knee Rotation and Loading during Spin and Step Turn.
Summary of "Knee Rotation and Loading during Spin and Step Turn."
The tibia axial rotation and knee joint valgus torque may increase anterior cruciate ligament (ACL) tension in direction changes during daily activities. The purpose of the study was to compare knee joint rotation and torque between step turn and spin turn in direction change following walking downstairs. The knee joint axial rotation and valgus torque were quantified from 20 healthy subjects. Significant differences were found between 2 turn strategies and between 2 legs. Spin turn showed significantly greater internal tibia rotation (13.5 degrees +/-5.9 degrees ), greater tibia rotation range of motion (-15.1 degrees approximately 13.5 degrees ) than step turn (5.1 degrees +/-5.2 degrees and -11.5 degrees approximately 5.1 degrees ) for both legs. Significantly greater peak valgus torque during spin turn (-0.91+/-0.33 Nm/kg) was found than that during step turn (-0.25+/-0.32 Nm/kg) for the left leg, while there was no significant difference between 2 turn strategies for the right leg (spin turn: -0.44+/-0.23 Nm/kg, and step turn: -0.40+/-0.27 N/kg). Excessive internal axial rotation combined with higher valgus torque may make the ACL and ACL graft more vulnerable to injury. The study indicated that, for right dominant people, turning with right leg or using step turn might reduce the stress on the ACL or ACL graft after ACL reconstruction.
Affiliation
Department of Mechanical Engineering and Engineering Science, Center for Biomedical Engineering Systems, University of North Carolina at Charlotte, NC, United States.
Journal Details
This article was published in the following journal.
Name: International journal of sports medicine
ISSN: 1439-3964
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20645235
- DOI: http://dx.doi.org/10.1055/s-0030-1261942
Medical and Biotech [MESH] Definitions
Spin Trapping
A technique for detecting short-lived reactive FREE RADICALS in biological systems by providing a nitrone or nitrose compound for an addition reaction to occur which produces an ELECTRON SPIN RESONANCE SPECTROSCOPY-detectable aminoxyl radical. In spin trapping, the compound trapping the radical is called the spin trap and the addition product of the radical is identified as the spin adduct. (Free Rad Res Comm 1990;9(3-6):163)
Spin Labels
Molecules which contain an atom or a group of atoms exhibiting an unpaired electron spin that can be detected by electron spin resonance spectroscopy and can be bonded to another molecule. (McGraw-Hill Dictionary of Chemical and Technical Terms, 4th ed)
Optical Rotation
The rotation of linearly polarized light as it passes through various media.
Knee Injuries
Injuries to the knee or the knee joint.
Knee Prosthesis
Replacement for a knee joint.
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