Short-Term Effect of Crural Fasciotomy on Kinematic Variability and Propulsion During Level Locomotion

Stahl, Victoria A.; Nichols, T. Richard

doi:10.1080/00222895.2014.914885

Cited by 8 publications

(2 citation statements)

References 27 publications

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“…Recent results suggest that rat and cat SO muscles act independently from their neighboring GAS and PL muscles (Maas and Sandercock 2008;Tijs et al 2015b). On the other hand, force transmission via the crural fascia, enveloping the ankle plantar flexion muscles, was shown to play an important role during cat locomotion (Stahl and Nichols 2014). Imaging studies in humans have reported effects of knee-joint angle (to change the length of the two-joint GAS) on deformations within the one-joint SO: muscle belly movements (Bojsen-Moller et al 2010), length changes of muscle fascicles (Tian et al 2012), and local tissue strains (Huijing et al 2011).…”

Section: Functional Relevance During Normal Movementsmentioning

confidence: 99%

Changes in muscle spindle firing in response to length changes of neighboring muscles

Smilde

Vincent

Baan

et al. 2016

Journal of Neurophysiology

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Skeletal muscle force can be transmitted to the skeleton, not only via its tendons of origin and insertion but also through connective tissues linking the muscle belly to surrounding structures. Through such epimuscular myofascial connections, length changes of a muscle may cause length changes within an adjacent muscle and hence, affect muscle spindles. The aim of the present study was to investigate the effects of epimuscular myofascial forces on feedback from muscle spindles in triceps surae muscles of the rat. We hypothesized that within an intact muscle compartment, muscle spindles not only signal length changes of the muscle in which they are located but can also sense length changes that occur as a result of changing the length of synergistic muscles. Action potentials from single afferents were measured intra-axonally in response to ramp-hold release (RHR) stretches of an agonistic muscle at different lengths of its synergist, as well as in response to synergist RHRs. A decrease in force threshold was found for both soleus (SO) and lateral gastrocnemius afferents, along with an increase in length threshold for SO afferents. In addition, muscle spindle firing could be evoked by RHRs of the synergistic muscle. We conclude that muscle spindles not only signal length changes of the muscle in which they are located but also local length changes that occur as a result of changing the length and relative position of synergistic muscles.

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Section: Functional Relevance During Normal Movementsmentioning

confidence: 99%

Changes in muscle spindle firing in response to length changes of neighboring muscles

Smilde

Vincent

Baan

et al. 2016

Journal of Neurophysiology

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“…The crural fascia was also cut longitudinally to the calcaneus but the medial and lateral fascial bands were kept intact. The longitudinal cut of the crural fascia was repaired after the tendon transfer procedure was finished since the crural fascia is known to influence hindlimb kinematics in the cat (Stahl and Nichols ). The PLANT tendon was separated from the Achilles tendon and cut at the level of the calcaneus.…”

Section: Methodsmentioning

confidence: 99%

Musculotendon adaptations and preservation of spinal reflex pathways following agonist-to-antagonist tendon transfer

et al. 2017

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Tendon transfer surgeries are performed to restore lost motor function, but outcomes are variable, particularly those involving agonist‐to‐antagonist muscles. Here, we evaluated the possibility that lack of proprioceptive feedback reorganization and musculotendon adaptations could influence outcomes. Plantaris‐to‐tibialis anterior tendon transfer along with resection of the distal third of the tibialis anterior muscle belly was performed in eight cats. Four cats had concurrent transection of the deep peroneal nerve. After 15–20 weeks, intermuscular length and force‐dependent sensory feedback were examined between hindlimb muscles, and the integrity of the tendon‐to‐tendon connection and musculotendon adaptations were evaluated. Three of the transferred tendons tore. A common finding was the formation of new tendinous connections, which often inserted near the original location of insertion on the skeleton (e.g., connections from plantaris toward calcaneus and from tibialis anterior toward first metatarsal). The newly formed tissue connections are expected to compromise the mechanical action of the transferred muscle. We found no evidence of changes in intermuscular reflexes between transferred plantaris muscle and synergists/antagonists whether the tendon‐to‐tendon connection remained intact or tore, indicating no spinal reflex reorganization. We propose the lack of spinal reflex reorganization could contribute the transferred muscle not adopting the activation patterns of the host muscle. Taken together, these findings suggest that musculotendon plasticity and lack of spinal reflex circuitry reorganization could limit functional outcomes after tendon transfer surgery. Surgical planning and outcomes assessments after tendon transfer surgery should consider potential consequences of the transferred muscle's intermuscular spinal circuit actions.

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Muscle, Biomechanics, and Implications for Neural Control

Ting

Chiel

2017

Neurobiology of Motor Control

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Short-Term Effect of Crural Fasciotomy on Kinematic Variability and Propulsion During Level Locomotion

Cited by 8 publications

References 27 publications

Changes in muscle spindle firing in response to length changes of neighboring muscles

Changes in muscle spindle firing in response to length changes of neighboring muscles

Musculotendon adaptations and preservation of spinal reflex pathways following agonist-to-antagonist tendon transfer

Muscle, Biomechanics, and Implications for Neural Control

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