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J Appl Physiol (September 24, 2004). doi:10.1152/japplphysiol.00482.2004
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Submitted on May 6, 2004
Accepted on September 22, 2004

REGION SPECIFIC MECHANICAL PROPERTIES OF THE HUMAN PATELLA TENDON

Bjarki T Haraldsson1, Per Aagaard2, Michael Krogsgaard3, Tine Alkjaer4, Michael Kjaer1, and S. Peter Magnusson1*

1 Sports Medicine Research Unit, Bispebjerg Hospital, Copenhagen, Denmark
2 Institute of Sports Exercise and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark
3 Orthopedic Department, Bispebjerg Hospital, Copenhagen, Denmark
4 The Panum Institute, Laboratory for Functional Anatomy, Institute of Medical Anatomy, Copenhagen, Denmark

* To whom correspondence should be addressed. E-mail: P.Magnusson{at}mfi.ku.dk.

The present study investigated the mechanical properties of tendon fascicles from the anterior and posterior human patellar tendon. Collagen fascicles from the anterior and posterior human patella tendon in healthy young men (mean±SD, 29.0±4.6 yr., n=6) were tested in a mechanical rig. A stereoscopic microscope equipped with a digital camera recorded elongation. The fascicles were pre-conditioned five cycles prior to the failure test based on pilot data on rat tendon fascicles. Human fascicle length increased with repeated cycles (P<0.05); cycle 5 differed from cycle 1 (P<0.05), but not 2-4. Peak stress and yield stress were greater for anterior (76.0±9.5 MPa, 56.6±10.4 MPa) than posterior fascicles (38.5±3.9 MPa, 31.6±2.9 MPa), P<0.05, while yield strain was similar (anterior 6.8±1.0 %, posterior 8.7±1.4 %). Tangent modulus was greater for the anterior (1231±188 MPa) than the posterior fascicles (583±122 MPa), P<0.05. In conclusion, tendon fascicles from the anterior portion of the human patellar tendon in young men displayed considerably greater peak and yield stress and tangent modulus compared to the posterior portion of the tendon, indicating regions specific material properties.




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