Muscle Force and Power Following Tendon Repair at Altered Tendon Length

Krochmal, Daniel J.; Kuzon, William M.; Urbanchek, Melanie G.

doi:10.1016/j.jss.2007.04.030

Cited by 12 publications

(7 citation statements)

References 42 publications

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“…Preliminary reports suggest that plantarflexor muscle structure is the primary determinant of function following Achilles tendon ruptures (1,2). Sudden changes in muscletendon tension, whether imposed by immobilization (32) or tendon repairs (18), elicit rapid remodeling of skeletal muscle. Therefore, the purpose of this study was to quantify medial gastrocnemius structure following the first month of acute Achilles tendon ruptures.…”

Section: Discussionmentioning

confidence: 99%

Gastrocnemius fascicles are shorter and more pennate throughout the first month following acute Achilles tendon rupture

Hullfish

O’Connor

Baxter

2018

Preprint

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1The purpose of this study was to characterize the short-term effects of Achilles tendon 2 ruptures on medial gastrocnemius. We hypothesized that the fascicles of the medial 3 gastrocnemius muscle of the injured Achilles tendon would be shorter and more pennate 4 immediately following the injury and would persist throughout 4 weeks post-injury. B-mode 5 longitudinal ultrasound images of the medial gastrocnemius were acquired in 10 adults who 6 suffered acute Achilles tendon ruptures and were treated non-operatively. Ultrasound images 7 were acquired during the initial clinical visit following injury as well as two and four weeks 8 following this initial clinical visit. Resting muscle structure was characterized by measuring 9 fascicle length, pennation angle, muscle thickness, and muscle echo intensity in both the injured 1 0 and contralateral (control) limbs. Fascicle length was 15% shorter (P < 0.001) and pennation 1 1 angle was 21% greater (P < 0.001) in the injured muscle compared to the uninjured (control) 1 2 muscle at the presentation of injury (week 0). These differences in fascicle length and pennation 1 3 angle persisted throughout the 4 weeks after the injury (P < 0.008). Muscle thickness changes 1 4were not detected at any of the post-injury visits (difference < 4%, P > 0.04). Echo intensity of 1 5 the injured limb was 8% lower at the presentation of the injury and 11% lower (P = 0.008) than 1 6 the contralateral muscle at 2 weeks following injury (P < 0.001) but returned to within 1% by 4 1 7 weeks (P = 0.393). Our results suggest that Achilles tendon ruptures elicit rapid changes in the

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Section: Discussionmentioning

confidence: 99%

Gastrocnemius fascicles are shorter and more pennate throughout the first month following acute Achilles tendon rupture

Hullfish

O’Connor

Baxter

2018

Preprint

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“…25 Increase in muscle force and power production capacity has also been thought to be a possible consequence of the muscle hypertrophy that develops after recovery. 23 However, our data clearly show that the gain of force after 30 days of Notexin injection is not due to this phenomenon, since CSA of recovered muscles is indeed significantly reduced compared with controls while no differences in myofiber number were found. Muscle containing thinner myotubes did not systematically compromise the capacity to generate force, suggesting that an increased number of muscle cells compensate for their small diameter.…”

Section: Discussionmentioning

confidence: 47%

“…The changes in maximum isometric force after injury are the best indicators of the degree of muscle damage. 21 However, most experimental procedures analyzing muscle function only explore the in vivo active force, [22][23][24][25] and do not include the susceptible alterations in the mechanical properties of the passive muscle component. In some muscle pathologies such as muscular dystrophies, the fibrosis in skeletal muscle is one of the consequences for progressive dysfunction and weakness of muscle, 26 suggesting the pivotal role of the elastic properties of muscle.…”

Section: Introductionmentioning

confidence: 99%

A quantitative method for the detection of muscle functional active and passive behavior recovery in models of damage-regeneration

Grasa

Ruiz

Muñoz

et al. 2018

Proceedings of the IMechE

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Unlike other organs, skeletal muscle is endowed with a remarkable potential for regeneration that depends on the presence of satellite cells. Histological and functional (force generation) recoveries after muscle damage are not parallel processes. The aim of this study is to examine the in vivo contractile properties and in vitro passive stress–stretch behavior of muscle during degeneration–regeneration processes. Notexin was injected into rat tibialis anterior muscle, and functional recovery and histological changes were compared. We found that histological improvement of damaged muscle is delayed in comparison with its capacity to generate force. The elastic properties of muscle were not altered in agreement with the unchanged cross-linking index, probably as a consequence of the unaltered deposition of total collagen during degeneration–regeneration processes together with the maintenance of the ratio of collagens type I and III.

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“…19 Muscles have been shown to adapt to functional length changes by altering the number of sarcomeres in series. 19 If the tendon is elongated with an extender, the number of sarcomeres in series is reduced, and the muscle produces less force and excursion. The muscle force and excursion can be preserved after tendon extension if the passive tension is altered to maintain the number of sarcomeres in series.…”

Section: Discussionmentioning

confidence: 99%

In Vivo Excursion of the Temporalis Muscle-Tendon Unit Using Electrical Stimulation

Boahene

Ishii

Byrne

2014

JAMA Facial Plast Surg

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The temporalis muscle has the potential to substitute for the function of paralyzed facial muscles in a single-stage procedure when transferred as a muscle-tendon unit (MTU). OBJECTIVE To measure the available excursion of the temporalis MTU after release from the coronoid. DESIGN, SETTING, AND PARTICIPANTS Thirteen consecutive patients undergoing the temporalis MTU transfer procedure for facial reanimation participated in this study in an academic research setting. MAIN OUTCOMES AND MEASURES Using transcutaneous electrical stimulation of the temporalis muscle, excursion of the temporalis muscle after its release as an MTU was recorded. Tension was varied on the released tendon during electrical stimulation of the muscle to determine the optimal muscle length at which the maximum excursion could be achieved. The tendon was inserted at the modiolus at the determined muscle length, and excursion of the oral commissure was recorded. Excursion data were then measured from the video recordings. RESULTS The mean excursion of the temporalis tendon after its detachment from the mandible and stimulation at an optimized passive tension was 20.6 mm (range, 14-30 mm) (n = 9). Following tendon insertion, the mean oral commissure excursion was 15.5 mm (range, 8-23 mm) (n = 13). CONCLUSIONS AND RELEVANCE The temporalis MTU has adequate available excursion following mobilization for dynamic reanimation of the paralyzed face. Electrical stimulation of the released temporalis tendon gives useful information that is reproducible and can be an important intraoperative adjunct to setting the MTU at an optimal tension to maximize force generation and excursion. LEVEL OF EVIDENCE NA.

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Muscle Force and Power Following Tendon Repair at Altered Tendon Length

Cited by 12 publications

References 42 publications

Gastrocnemius fascicles are shorter and more pennate throughout the first month following acute Achilles tendon rupture

Gastrocnemius fascicles are shorter and more pennate throughout the first month following acute Achilles tendon rupture

A quantitative method for the detection of muscle functional active and passive behavior recovery in models of damage-regeneration

In Vivo Excursion of the Temporalis Muscle-Tendon Unit Using Electrical Stimulation

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