Haraldsson B T, Aagaard P, Krogsgaard M, Alkjaer T, Kjaer M, Magnusson S P
Institute Sports Medicine, Bispebjerg Hospital, Bispebjerg bakke 23, 2400 Copenhagen NV, Denmark.
J Appl Physiol (1985). 2005 Mar;98(3):1006-12. doi: 10.1152/japplphysiol.00482.2004. Epub 2004 Sep 24.
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.
本研究调查了人髌腱前后部腱束的力学性能。对健康年轻男性（平均±标准差，29.0±4.6岁，n = 6）髌腱前后部的胶原束在力学试验台上进行测试。配备数码相机的立体显微镜记录伸长情况。根据大鼠腱束的预试验数据，在破坏试验前对腱束进行5个循环的预处理。人腱束长度随循环次数增加（P < 0.05）；第5个循环与第1个循环不同（P < 0.05），但与第2 - 4个循环无差异。前部腱束的峰值应力和屈服应力（分别为76.0±9.5和56.6±10.4 MPa）大于后部腱束（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%）。前部腱束的切线模量（1231±188 MPa）大于后部腱束（583±122 MPa），P < 0.05。总之，与腱的后部相比，年轻男性髌腱前部的腱束表现出显著更高的峰值应力、屈服应力和切线模量，表明其具有区域特异性材料特性。
