Patterns of neuromuscular activity following tendon transfer in the upper limb: A preliminary study

Leffert, Robert D.; Meister, Melvin

doi:10.1016/s0363-5023(76)80036-6

Cited by 17 publications

(8 citation statements)

References 1 publication

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“…However, we did not find any evidence of changes in intermuscular spinal reflex pathways in response to the changes in the organization of the musculoskeletal system. These findings are in general agreement with previous literature on tendon transfers in which no or limited changes in muscle activation patterns have been reported during movement (locomotion, grasping) in human patients as well as different animal models (e.g., rat, cat), including neonatal animals (Sperry ; Leffert and Meister ; Forssberg and Svartengren ; Illert et al. ; Loeb ; Slawinska and Kasicki ; Maas et al.…”

Section: Discussionsupporting

confidence: 93%

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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Section: Discussionsupporting

confidence: 93%

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

et al. 2017

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“…First, we claim that at least some sensorimotor systems must deduce the sensitivity derivative matrix relating e and u. The main evidence is that some systems recover when that relation changes so as to reverse ∂L/∂ u (Stratton, 1897;Ewert, 1930;Sperry, 1945;Missiuro & Kozlowski, 1963;Vera et al, 1975;Leffert & Meister, 1976;Yumiya et al, 1979;Brinkman et al, 1983;Sugita, 1996). Further support comes from the arguments in sections 7.1 and 7.2 that fast motor learning and tool use suggest detailed knowledge of sensitivity derivatives.…”

Section: Resultsmentioning

confidence: 83%

“…Similarly, when antagonist muscles or nerves are transposed, then the relation between motor commands and motion is reversed, but animals can regain their coordination (Sperry, 1945;Missiuro & Kozlowski, 1963;Vera, Lewin, Kasa, & Calderon, 1975;Leffert & Meister, 1976;Yumiya, Larsen, & Asanuma, 1979;Brinkman, Porter, & Norman, 1983).…”

Section: Experimental Evidencementioning

confidence: 99%

“…from species to species. On the tasks that have been tested, it seems that primates adapt consistently, cats and rats show mixed results, and newts never recover (Ewert, 1930;Sperry, 1943Sperry, , 1945Vera et al, 1975;Leffert & Meister, 1976;Yumiya et al, 1979;Brinkman et al, 1983;Forssberg & Svatengren, 1983;Sugita, 1996). So maybe simple organisms do rely solely on innate estimates of sensitivity.…”

Section: Experimental Evidencementioning

confidence: 99%

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Sensitivity Derivatives for Flexible Sensorimotor Learning

2008

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To learn effectively, an adaptive controller needs to know its sensitivity derivatives--the variables that quantify how system performance depends on the commands from the controller. In the case of biological sensorimotor control, no one has explained how those derivatives themselves might be learned, and some authors suggest they are not learned at all but are known innately. Here we show that this knowledge cannot be solely innate, given the adaptive flexibility of neural systems. And we show how it could be learned using forms of information transport that are available in the brain. The mechanism, which we call implicit supervision, helps explain the flexibility and speed of sensorimotor learning and our ability to cope with high-dimensional work spaces and tools.

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“…The example of tendon transfer surgery is particularly relevant to test the procedure since some reversals of functions were observed in the transferred muscles (Leffert & Meister, 1976;Illert, Trauner, Weller, & Wiedemann, 1986). Thus, the rerouting of some tendons will affect the muscle involvement for joint equilibrium, while the mechanical constraints of the hand remain unchanged (i.e., secondary moments of the wrist).…”

Section: Introductionmentioning

confidence: 99%

Understanding of hand muscles involvement: towards a linkage between biomechanical modeling and motor control theories

Quaine

Paclet

Vigouroux³

et al. 2013

Mov Sport Sci/Sci Mot

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Abstract. This study aimed at testing the pertinence of mimicking motor control theories in biomechanical models as a strategic direction for improving the understanding of muscle involvement. The theory of "minimization of the secondary moments of the hand" was added to an initial biomechanical model and was tested for several anatomic hand configurations (intact hand, paralyzed hand with radial nerve palsy, and transferred hand after tendon transfers). Results showed that the muscle sharing is governed by the minimisation of secondary moment for each anatomic hand configuration. In particular, co-contractions of extensor muscles were used to stabilize the wrist joint in both intact and transferred hands. Overall, this study showed that specific tuning of motor control theories rules may represent a strategic direction for improving biomechanical models. Enhancements are suggested in order to generalize this approach to others musculoskeletal systems.Key words: Biomechanical model, optimization, hand/finger muscle, tendon transfers, motor control theories Résumé. Utilisation des théories du contrôle moteur dans les modèles biomécaniques de la main pour mieux comprendre le recrutement musculaire. L'objectif de ce travail est de montrer que les lois du contrôle moteur de la main peuventêtre utilisées dans les modèles biomécaniques pour mieux comprendre le recrutement musculaire. Pour cela, le principe de (( minimisation des moments secondaires )) est implémenté dans un modèle biomécanique de la main en rajoutant l'équilibre de l'articulation du poignet dans la procédure d'estimation des tensions musculaires. Différentes conditions anatomiques de main sont testées : main intacte, main paralysée suiteà une atteinte du nerf radial et main réanimée suiteà un transfert tendineux (technique dite de (( Tsugé ))). Cela permet de modifier les capacités musculaires tout en gardant les moments secondaires identiques. Les résultats montrent que la distribution des forces entre les muscles des doigts et du poignet reste fidèle au principe de minimisation des moments secondaires quelque soit la condition anatomique testée. Lorsque le système musculaire le permet (main intacte et réanimée), le recoursà l'utilisation de co-contractions avec les extenseurs des doigts reste la solution la plus avantageuse pour stabiliser les moments secondaires. Il apparaît que l'utilisation du principe de minimisation des moments secondaires permet d'améliorer les modèles biomécaniques dans leur capacitéà montrer et expliquer les co-contractions. Au regard de ces résultats, la généralisation de cette méthodologie pour d'autres modèles biomécaniques est discutée.

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Patterns of neuromuscular activity following tendon transfer in the upper limb: A preliminary study

Cited by 17 publications

References 1 publication

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

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

Sensitivity Derivatives for Flexible Sensorimotor Learning

Understanding of hand muscles involvement: towards a linkage between biomechanical modeling and motor control theories

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