Effect of stress shielding on the mechanical properties of healing tissue in the patellar tendon after removal of its central third

2002 ◽  
Vol 2002.13 (0) ◽  
pp. 21-22
Author(s):  
Takafumi HIRO ◽  
Yoshiaki KITAMURA ◽  
Harukazu TOHYAMA ◽  
Kazunori YASUDA ◽  
Kozaburo HAYASHI
Keyword(s):  
Mechanical Properties ◽  
Patellar Tendon ◽  
Stress Shielding ◽  
Healing Tissue

Effects of Restressing on the Mechanical Properties of Stress-Shielded Patellar Tendons in Rabbits

1996 ◽  
Vol 118 (2) ◽  
pp. 216-220 ◽  
Author(s):  
Noritaka Yamamoto ◽  
Kozaburo Hayashi ◽  
Hiroyuki Kuriyama ◽  
Kazunori Ohno ◽  
Kazunori Yasuda ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Patellar Tendon ◽  
Stress Shielding ◽  
Tangent Modulus ◽  
Tissue Change

We studied the effects of restressing on the mechanical properties and morphology of stress-shielded rabbit patellar tendons. After completely unloading the patellar tendon for 1 to 3 weeks, tension was again applied to the tendon for the subsequent 3 to 12 weeks. Although the stress shielding markedly decreased the tangent modulus and tensile strength of the tendon, restressing significantly increased them. However, the mechanical properties of the tendon were not completely recovered even after a prolonged period of restressing. The microstructure of the tendon was also restored by although the recovery was incomplete. These results indicate that the mechanical properties and morphology of tendinous tissue change in response to mechanical demands.

Effects of complete stress-shielding on the mechanical properties and histology of in situ frozen patellar tendon

1993 ◽  
Vol 11 (4) ◽  
pp. 592-602 ◽  
Author(s):  
Kazunori Ohno ◽  
Kazunori Yasuda ◽  
Noritaka Yamamoto ◽  
Kiyoshi Kaneda ◽  
Kozaburo Hayashi
Keyword(s):  
Mechanical Properties ◽  
Patellar Tendon ◽  
Stress Shielding

Effects of stress shielding and subsequent restressing on mechanical properties of regenerated and residual tissues in rabbit patellar tendon after resection of its central one-third

2009 ◽  
Vol 42 (11) ◽  
pp. 1592-1597 ◽  
Author(s):  
Eijiro Maeda ◽  
Hiroyuki Asanuma ◽  
Hitoshi Noguchi ◽  
Harukazu Tohyama ◽  
Kazunori Yasuda ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Patellar Tendon ◽  
Stress Shielding ◽  
Effects Of Stress

Effects of Stress Shielding on the Mechanical Properties of Rabbit Patellar Tendon

1993 ◽  
Vol 115 (1) ◽  
pp. 23-28 ◽  
Author(s):  
N. Yamamoto ◽  
K. Ohno ◽  
K. Hayashi ◽  
H. Kuriyama ◽  
K. Yasuda ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Patellar Tendon ◽  
Steel Wire ◽  
Stress Shielding ◽  
Maximum Load ◽  
Tensile Tests ◽  
Tibial Tubercle ◽  
Cross Sectional ◽  
Knee Ligament ◽  
Control Value

Mechanical properties of the stress-shielded patellar tendon were studied in the rabbit knee. Stress shielding was accomplished by stretching a stainless-steel wire installed between the patella and tibial tubercle and thus, releasing the tension in the patellar tendon completely. Tensile tests were carried out on the specimens obtained from the patellar tendons which were exposed to the stress shielding for 1 to 6 weeks. The stress shielding changed the mechanical properties of the patellar tendon significantly: it decreased the tangent modulus and tensile strength to 9 percent of the control values after 3 weeks. There was a 131 percent increase in the cross-sectional area and a 15 percent decrease in the tendinous length. Remarkable changes were also observed in the structural properties: for example, the maximum load of the bone-tendon complex decreased to 20 percent of the control value after 3 weeks. Histological studies showed that the stress shielding increased the number of fibroblasts and decreased the longitudinally aligned collagen bundles. These results imply that if no stress is applied to the autograft in the case of augmentative reconstruction of the knee ligament, the graft strength decreases remarkably.

Habitual loading results in tendon hypertrophy and increased stiffness of the human patellar tendon

2008 ◽  
Vol 105 (3) ◽  
pp. 805-810 ◽  
Author(s):  
C. Couppé ◽  
M. Kongsgaard ◽  
P. Aagaard ◽  
P. Hansen ◽  
J. Bojsen-Moller ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Patellar Tendon ◽  
Cross Sectional Area ◽  
Isometric Contractions ◽  
Sectional Area ◽  
Cross Sectional ◽  
Strength Difference ◽  
Distal Tendon

The purpose of this study was to examine patellar tendon (PT) size and mechanical properties in subjects with a side-to-side strength difference of ≥15% due to sport-induced loading. Seven elite fencers and badminton players were included. Cross-sectional area (CSA) of the PT obtained from MRI and ultrasonography-based measurement of tibial and patellar movement together with PT force during isometric contractions were used to estimate mechanical properties of the PT bilaterally. We found that distal tendon and PT, but not mid-tendon, CSA were greater on the lead extremity compared with the nonlead extremity (distal: 139 ± 11 vs. 116 ± 7 mm2; mid-tendon: 85 ± 5 vs. 77 ± 3 mm2; proximal: 106 ± 7 vs. 83 ± 4 mm2; P < 0.05). Distal tendon CSA was greater than proximal and mid-tendon CSA on both the lead and nonlead extremity ( P < 0.05). For a given common force, stress was lower on the lead extremity (52.9 ± 4.8 MPa) compared with the nonlead extremity (66.0 ± 8.0 MPa; P < 0.05). PT stiffness was also higher in the lead extremity (4,766 ± 716 N/mm) compared with the nonlead extremity (3,494 ± 446 N/mm) ( P < 0.05), whereas the modulus did not differ (lead 2.27 ± 0.27 GPa vs. nonlead 2.16 ± 0.28 GPa) at a common force. These data show that a habitual loading is associated with a significant increase in PT size and mechanical properties.

scholarly journals Does knee joint cooling change in vivo patellar tendon mechanical properties?

2016 ◽  
Vol 116 (10) ◽  
pp. 1921-1929 ◽  
Author(s):  
Luis M. Alegre ◽  
Michael Hasler ◽  
Sebastian Wenger ◽  
Werner Nachbauer ◽  
Robert Csapo
Keyword(s):  
Mechanical Properties ◽  
Knee Joint ◽  
Patellar Tendon

scholarly journals Mechanical properties of the patellar tendon in elite volleyball players with and without patellar tendinopathy

2013 ◽  
Vol 47 (13) ◽  
pp. 862-868 ◽  
Author(s):  
Christian Helland ◽  
Jens Bojsen-Møller ◽  
Truls Raastad ◽  
Olivier R Seynnes ◽  
Marie M Moltubakk ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Patellar Tendon ◽  
Patellar Tendinopathy ◽  
Volleyball Players

Effects of Cyclic Stress on the Mechanical Properties of Cultured Collagen Fascicles from the Rabbit Patellar Tendon

2003 ◽  
Vol 125 (6) ◽  
pp. 893-901 ◽  
Author(s):  
Ei Yamamoto ◽  
Susumu Tokura ◽  
Kozaburo Hayashi
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Patellar Tendon ◽  
Control Level ◽  
Quadratic Function ◽  
Peak Stress ◽  
Cyclic Stress ◽  
Original Strength

Effects of cyclic stress on the mechanical properties of collagen fascicles were studied by in vitro tissue culture experiments. Collagen fascicles (approximately 300 μm in diameter) obtained from the rabbit patellar tendon were applied cyclic load at 4 Hz for one hour per day during culture period for one or two weeks, and then their mechanical properties were determined using a micro-tensile tester. There was a statistically significant correlation between tensile strength and applied peak stress in the range of 0 to 5 MPa, and the relation was expressed by a quadratic function. The maximum strength (19.4 MPa) was obtained at the applied peak stress of 1.8 MPa. The tensile strength of fascicles were within a range of control values, if they were cultured under peak stresses between 1.1 and 2.6 MPa. Similar results were also observed in the tangent modulus, which was maintained at control level under applied peak stresses between 0.9 and 2.8 MPa. The stress of 0.9 to 1.1 MPa is equivalent to approximately 40% of the in vivo peak stress which is developed in the intact rabbit patellar tendon by running, whereas that of 2.6 to 2.8 MPa corresponds to approximately 120% of the in vivo peak stress. Therefore, the fascicles cultured under applied peak stresses of lower than 40% and higher than 120% of the in vivo peak stress do not keep the original strength and modulus. These results indicate that the mechanical properties of cultured collagen fascicles strongly depend upon the magnitude of the stress applied during culture, which are similar to our previous results observed in stress-shielded and overstressed patellar tendons in vivo.

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