Region-specific mechanical properties of the human patella tendon
Region-specific mechanical properties of the human patella tendon
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DOI：
10.1152/japplphysiol.00482.2004
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发表时间：
2005-03-01
影响因子：
3.3
通讯作者：
Magnusson, SP
中科院分区：
文献类型：
--
作者：
Haraldsson, BT;Aagaard, P;Magnusson, SP
本研究探讨了前，后人髌腱肌腱束的力学性能。在机械装置中测试了健康年轻男性（平均值+/- SD，29.0 +/- 4.6岁，n = 6）的前和后人髌腱的胶原纤维束。配备有数码相机的体视显微镜记录伸长。根据大鼠肌腱束的试验数据，在失效测试前对肌腱束进行5个循环的预处理。人类肌束长度随着重复周期的增加而增加（P < 0.05）;周期5与周期1不同（P < 0.05），但与周期2 - 4无关。前牙的峰值应力和屈服应力更大，（分别为76.0 +/- 9.5和56.6 +/- 10.4 MPa）（分别为38.5 +/- 3.9和31.6 +/- 2.9 MPa），P < 0.05，而屈服应变相似（前部6.8 +/-1.0%，后部8.7 +/- 1.4%）。前束的切线模量（1，231 +/- 188 MPa）大于后束（583 +/- 122 MPa），P < 0.05。总之，与肌腱后部相比，年轻男性人体髌骨肌腱前部的肌腱束显示出明显更大的峰值和屈服应力以及切线模量，这表明了特定区域的材料特性。
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.