Region-specific mechanical properties of the human patella tendon

B T Haraldsson; P Aagaard; M Krogsgaard; T Alkjaer; M Kjaer; S P Magnusson

doi:10.1152/japplphysiol.00482.2004

Region-specific mechanical properties of the human patella tendon

B T Haraldsson, P Aagaard, M Krogsgaard, T Alkjaer, M Kjaer, S P Magnusson

Department of Neuroscience

107 Citations (Scopus)

Abstract

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 patellar 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 preconditioned five cycles before the failure test based on pilot data on rat tendon fascicle. Human fascicle length increased with repeated cycles (P < 0.05); cycle 5 differed from cycle 1 (P < 0.05), but not cycles 2-4. Peak stress and yield stress were greater for anterior (76.0 +/- 9.5 and 56.6 +/- 10.4 MPa, respectively) than posterior fascicles (38.5 +/- 3.9 and 31.6 +/- 2.9 MPa, respectively), 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 (1,231 +/- 188 MPa) than the posterior (583 +/- 122 MPa) fascicles, 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 with the posterior portion of the tendon, indicating region-specific material properties.

Original language	English
Journal	Journal of Applied Physiology
Volume	98
Issue number	3
Pages (from-to)	1006-12
Number of pages	6
ISSN	8750-7587
DOIs	https://doi.org/10.1152/japplphysiol.00482.2004
Publication status	Published - 2004

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@article{64ba9fd0994c11debc73000ea68e967b,

title = "Region-specific mechanical properties of the human patella tendon",

abstract = "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 patellar 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 preconditioned five cycles before the failure test based on pilot data on rat tendon fascicle. Human fascicle length increased with repeated cycles (P < 0.05); cycle 5 differed from cycle 1 (P < 0.05), but not cycles 2-4. Peak stress and yield stress were greater for anterior (76.0 +/- 9.5 and 56.6 +/- 10.4 MPa, respectively) than posterior fascicles (38.5 +/- 3.9 and 31.6 +/- 2.9 MPa, respectively), 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 (1,231 +/- 188 MPa) than the posterior (583 +/- 122 MPa) fascicles, 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 with the posterior portion of the tendon, indicating region-specific material properties.",

author = "Haraldsson, {B T} and P Aagaard and M Krogsgaard and T Alkjaer and M Kjaer and Magnusson, {S P}",

note = "Keywords: Adult; Animals; Biomechanics; Elasticity; Humans; Knee Joint; Male; Patellar Ligament; Physical Stimulation; Rats; Species Specificity; Stress, Mechanical; Tendons; Tensile Strength",

year = "2004",

doi = "10.1152/japplphysiol.00482.2004",

language = "English",

volume = "98",

pages = "1006--12",

journal = "Journal of Applied Physiology",

issn = "8750-7587",

publisher = "American Physiological Society",

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T1 - Region-specific mechanical properties of the human patella tendon

AU - Haraldsson, B T

AU - Aagaard, P

AU - Krogsgaard, M

AU - Alkjaer, T

AU - Kjaer, M

AU - Magnusson, S P

N1 - Keywords: Adult; Animals; Biomechanics; Elasticity; Humans; Knee Joint; Male; Patellar Ligament; Physical Stimulation; Rats; Species Specificity; Stress, Mechanical; Tendons; Tensile Strength

PY - 2004

Y1 - 2004

N2 - 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 patellar 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 preconditioned five cycles before the failure test based on pilot data on rat tendon fascicle. Human fascicle length increased with repeated cycles (P < 0.05); cycle 5 differed from cycle 1 (P < 0.05), but not cycles 2-4. Peak stress and yield stress were greater for anterior (76.0 +/- 9.5 and 56.6 +/- 10.4 MPa, respectively) than posterior fascicles (38.5 +/- 3.9 and 31.6 +/- 2.9 MPa, respectively), 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 (1,231 +/- 188 MPa) than the posterior (583 +/- 122 MPa) fascicles, 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 with the posterior portion of the tendon, indicating region-specific material properties.

AB - 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 patellar 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 preconditioned five cycles before the failure test based on pilot data on rat tendon fascicle. Human fascicle length increased with repeated cycles (P < 0.05); cycle 5 differed from cycle 1 (P < 0.05), but not cycles 2-4. Peak stress and yield stress were greater for anterior (76.0 +/- 9.5 and 56.6 +/- 10.4 MPa, respectively) than posterior fascicles (38.5 +/- 3.9 and 31.6 +/- 2.9 MPa, respectively), 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 (1,231 +/- 188 MPa) than the posterior (583 +/- 122 MPa) fascicles, 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 with the posterior portion of the tendon, indicating region-specific material properties.

U2 - 10.1152/japplphysiol.00482.2004

DO - 10.1152/japplphysiol.00482.2004

M3 - Journal article

C2 - 15448120

SN - 8750-7587

VL - 98

SP - 1006

EP - 1012

JO - Journal of Applied Physiology

JF - Journal of Applied Physiology

IS - 3

ER -

Region-specific mechanical properties of the human patella tendon

Abstract

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