METHODS: Displacement behaviour of MTJ was tracked from (1) the exact MTJ; and (2) from an insertion point of a muscle fascicle on the aponeurosis 1.3 ± 0.6 cm proximal to the MTJ, in both limbs of patients with unilateral Achilles tendon rupture (ATR) (n = 22, 4 females, 42 ± 9 years, 177 ± 9 cm, 79 ± 10 kg).
RESULTS: In the non-injured limb, displacement (1.3 ± 0.5 cm vs. 1.1 ± 0.6 cm) and strain (6.7 ± 2.8% vs. 5.8 ± 3.3%) during maximal voluntary contraction were larger when tracking a point on the aponeurosis than when tracking the MTJ (both p < 0.001). The same was true for all contraction levels, and both limbs.
CONCLUSIONS: Tracking a point on the aponeurosis consistently exaggerates estimates of tendon displacement, and the magnitude of this effect is contraction intensity-dependent. When quantifying displacement and strain of the Achilles tendon, the MTJ should be tracked directly, rather than tracking a surrogate point proximal to the MTJ. The latter method includes part of the aponeurosis, which due to its relative compliance, artificially increases estimates of MTJ displacement and strain.
方法:从(1)精确的MTJ跟踪MTJ的位移行为;(2)从靠近MTJ1.3±0.6cm的腱膜上的肌束的插入点,单侧跟腱断裂(ATR)患者的四肢(n=22,4名女性,42±9岁,177±9厘米,79±10kg)。
结果:在未受伤的肢体中,位移(1.3±0.5cmvs.1.1±0.6cm)和应变(6.7±2.8%vs.5.8±3.3%)在最大自愿收缩期间,当跟踪肌腱膜上的点时比跟踪MTJ时更大(均p<0.001)。所有收缩水平都是如此,和四肢。
结论:追踪肌腱膜上的一点始终夸大了肌腱位移的估计,这种效应的大小与收缩强度有关。当量化跟腱的位移和应变时,应该直接跟踪MTJ,而不是跟踪MTJ附近的代理点。后一种方法包括部分肌腱膜,由于其相对合规性,人为增加MTJ位移和应变的估计。