Jaspers R T, Brunner R, Baan G C, Huijing P A
Instituut voor Fundamentele en Klinische Bewegingswetenschappen, Faculteit Bewegingswetenschappen, Vrije Universiteit, Amsterdam, The Netherlands.
Anat Rec. 2002 Feb 1;266(2):123-35. doi: 10.1002/ar.10045.
Intervention with the continuity of the tendon and part of the muscle fibers allows investigation of myofascial force transmission. The present study investigates the effects of proximal aponeurotomy on length-force characteristics and the geometry of the extensor digitorum longus (EDL) muscle, and compares those effects with the effects of both distal tenotomy (TT) and intramuscular fasciotomy (IF) of the EDL. After proximal aponeurotomy, the intramuscular connective tissue ruptured spontaneously below the location of intervention. Due to this rupturing, a gap developed within the proximal aponeurosis. The fibers that were continuous with the tendon at only one end were substantially shorter than before the intervention. Optimum muscle force was reduced by 29%. After distal TT (of heads II-IV) a gap developed within the muscle belly. This gap increased at higher muscle lengths. However, the length of the gap was much smaller than after aponeurotomy. Despite the TT-related gap, there was no rupturing of intramuscular connective tissue at the interface between heads IV and V, as there was after proximal aponeurotomy. The effects of TT on length-force characteristics and on lengths of fibers continuous with the tendon at only one end were much less compared to the effects of aponeurotomy. Subsequent IF for two-thirds the length of the interface between heads IV and V resulted in changes similar to the effects of proximal aponeurotomy plus rupture. The contrast regarding the occurrence of intramuscular connective tissue rupture indicates increased failure strength of the intramuscular connective tissue at distal locations. It is hypothesized that for multitendoned muscles in vivo, local shear and stress deformations will initiate local adaptation of the intramuscular connective tissue.
对肌腱连续性及部分肌纤维进行干预，有助于研究肌筋膜力的传递。本研究调查了近端腱膜切开术对趾长伸肌（EDL）长度 - 力特性及几何形态的影响，并将这些影响与EDL远端肌腱切断术（TT）和肌内筋膜切开术（IF）的影响进行比较。近端腱膜切开术后，肌内结缔组织在干预部位下方自发破裂。由于这种破裂，近端腱膜内形成了一个间隙。仅一端与肌腱相连的纤维比干预前明显缩短。最佳肌肉力量降低了29%。在远端进行肌腱切断术（针对II - IV头肌）后，肌腹内形成了一个间隙。在肌肉长度增加时，这个间隙会增大。然而，该间隙的长度比腱膜切开术后小得多。尽管存在与肌腱切断术相关的间隙，但IV头肌和V头肌之间的界面处肌内结缔组织并未像近端腱膜切开术后那样破裂。与腱膜切开术的影响相比，肌腱切断术对长度 - 力特性以及仅一端与肌腱相连的纤维长度的影响要小得多。随后对IV头肌和V头肌之间三分之二长度的界面进行肌内筋膜切开术，产生的变化类似于近端腱膜切开术加破裂的效果。关于肌内结缔组织破裂发生情况的对比表明，远端部位的肌内结缔组织破坏强度增加。据推测，对于体内的多腱肌肉，局部剪切和应力变形将引发肌内结缔组织的局部适应性变化。
