Couppé C, Kongsgaard M, Aagaard P, Hansen P, Bojsen-Moller J, Kjaer M, Magnusson S P
Institute of Sports Medicine Copenhagen, Bispebjerg Hospital Bispebjerg bakke 23, 2400 Copenhagen NV, Denmark.
J Appl Physiol (1985). 2008 Sep;105(3):805-10. doi: 10.1152/japplphysiol.90361.2008. Epub 2008 Jun 12.
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 > or =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 mm(2); mid-tendon: 85 +/- 5 vs. 77 +/- 3 mm(2); proximal: 106 +/- 7 vs. 83 +/- 4 mm(2); 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.
本研究的目的是检查因运动引起的负荷导致两侧力量差异≥15%的受试者的髌腱（PT）大小和力学性能。纳入了7名精英击剑运动员和羽毛球运动员。通过MRI获得PT的横截面积（CSA），并基于超声测量胫骨和髌骨运动以及等长收缩期间的PT力，以双侧评估PT的力学性能。我们发现，与非优势肢体相比，优势肢体的远端肌腱和PT（而非肌腱中部）的CSA更大（远端：139±11 vs. 116±7 mm²；肌腱中部：85±5 vs. 77±3 mm²；近端：106±7 vs. 83±4 mm²；P<0.05）。在优势和非优势肢体上，远端肌腱CSA均大于近端和肌腱中部CSA（P<0.05）。对于给定的相同力，优势肢体的应力（52.9±4.8 MPa）低于非优势肢体（66.0±8.0 MPa；P<0.05）。优势肢体的PT刚度（4766±716 N/mm）也高于非优势肢体（3494±446 N/mm）（P<0.05），而在相同力下模量无差异（优势侧2.27±0.27 GPa vs. 非优势侧2.16±0.28 GPa）。这些数据表明，习惯性负荷与PT大小和力学性能的显著增加有关。
