The effects of muscle-tendon surgery on dynamic electromyographic patterns and muscle tone in children with cerebral palsy

Dreher, Thomas; Brunner, Reinald; Végvári, Dóra; Heitzmann, Daniel; Gantz, Simone; Maier, Michael W.; Braatz, Frank; Wolf, Sebastian I.

doi:10.1016/j.gaitpost.2012.11.013

Cited by 22 publications

(30 citation statements)

References 27 publications

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“…Average intra-session and inter-session CS were greater than 0.9 for all muscles analyzed in this study, indicating that although EMG data can exhibit variability between gait cycles and visits, that the similarity of waveforms is still high compared to the myriad potential ways an individual could modulate their muscle activity. These results also support prior research in children with CP that has noted minimal changes in EMG activity after treatments such as single-event multi-level orthopaedic surgery [29, 30]. Overall, these results demonstrate that EMG signals are repeatable between visits during gait for children with CP, but demonstrate variance between gait cycles similar to TD children that should lead clinicians and researchers to exercise caution in over-interpreting small changes in EMG recordings.…”

Section: Discussionsupporting

confidence: 85%

Repeatability of electromyography recordings and muscle synergies during gait among children with cerebral palsy

et al. 2019

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Background: Clinical gait analysis is commonly used in the evaluation and treatment of children with cerebral palsy (CP). While the repeatability of kinematic and kinetic measures of gait has previously been evaluated, the repeatability of electromyography (EMG) recordings or measures calculated from EMG data, such as muscle synergies, remains unclear for this population. Research Question: Are EMG-based measures in clinical gait analysis repeatable between visits for children with CP? Methods: We recruited 20 children with bilateral CP who had been referred for clinical gait analysis. The children completed two visits less than six weeks apart with EMG data collected bilaterally from five muscles (rectus femoris, medial hamstrings, vastus lateralis, anterior tibialis, and medial gastrocnemius). Variance ratio and cosine similarity were used to evaluate repeatability of EMG waveforms between visits. Nonnegative matrix factorization was used to calculate synergies from EMG data at each visit to compare synergy weights and activations. Results & Significance: The inter-visit variance ratios of EMG data for children with CP were similar to previously reported results for typically-developing children and unimpaired adults (range: 0.39 for vastus lateralis to 0.66 for rectus femoris). The average cosine similarity of the EMG waveforms between visits was greater than 0.9 for all muscles, while synergy weights and activations also had high similarity - greater than 0.8 and 0.9 between visits, respectively. These results demonstrate that EMG repeatability between visits during clinical gait analysis for children with CP is similar to unimpaired individuals. These results provide a baseline for evaluating whether observed changes in EMG recordings between visits reflect real changes in muscle activity or are within the range of inter-visit variability.

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Section: Discussionsupporting

confidence: 85%

Repeatability of electromyography recordings and muscle synergies during gait among children with cerebral palsy

et al. 2019

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“…12 Calf muscle tone measured by modified Ashworth scale decreased significantly, underlining the findings of previous investigations. 11,39 However, it is to be expected that, like in children, increased muscle tone will reappear after years. 11 Hence, it is of major interest if equinus deformity may recur in adults in the long-term perspective.…”

Section: Discussionmentioning

confidence: 99%

Equinus Correction During Multilevel Surgery in Adults With Cerebral Palsy

et al. 2018

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“…Dreher and colleagues [21] noted that after MT surgery, muscle tone as measured by surface electromyography increased and subsequently gait kinematics slightly deteriorated in as little as 3 years after surgery. These results may highlight a key difference in SDR when compared with MT surgery, in that SDR procedures are eliminating a neurologic mechanism for increased muscle tone, and thus changes in gait may be expected to be maintained, whereas MT surgery does not eliminate neural mechanisms of spasticity, and thus a progressive deterioration in gait may be seen over time.…”

Section: Discussionmentioning

confidence: 99%

Comparative Effects of Multilevel Muscle Tendon Surgery, Osteotomies, and Dorsal Rhizotomy on Functional and Gait Outcome Measures for Children With Cerebral Palsy

Feger

Lunsford

Sauer

et al. 2014

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The effects of muscle-tendon surgery on dynamic electromyographic patterns and muscle tone in children with cerebral palsy

Cited by 22 publications

References 27 publications

Repeatability of electromyography recordings and muscle synergies during gait among children with cerebral palsy

Repeatability of electromyography recordings and muscle synergies during gait among children with cerebral palsy

Equinus Correction During Multilevel Surgery in Adults With Cerebral Palsy

Comparative Effects of Multilevel Muscle Tendon Surgery, Osteotomies, and Dorsal Rhizotomy on Functional and Gait Outcome Measures for Children With Cerebral Palsy

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