Randal R. Betz

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An adaptive neuro-fuzzy inference system (ANFIS) with a supervisory control system (SCS) was used to predict the occurrence of gait events using the electromyographic (EMG) activity of lower extremity muscles in the child with cerebral palsy (CP). This is anticipated to form the basis of a control algorithm for the application of electrical stimulation (ES)(More)
The objective of this study was to develop and test the feasibility of a model that employs electromyographic (EMG) signals to predict the occurrence of gait events in the child with cerebral palsy (CP). This model could be the basis of a future functional electrical stimulation (FES) control system to assist gait. Two children were implanted with bifilar(More)
The sagittal spinopelvic balance is poorly documented in normal pediatric subjects. The purpose of this study is to characterize the sagittal spinopelvic balance in the pediatric population and to evaluate the correlations between spinopelvic parameters. Seven parameters were evaluated from the lateral standing radiographs of 341 normal subjects aged 3-18(More)
STUDY DESIGN The design was a nonexperimental, repeated measures design. OBJECTIVE To examine the reliability of repeated diffusion tensor imaging (DTI) values of the pediatric cord and to compare DTI values with values obtained on the clinical examination and findings from conventional magnetic resonance imaging (MRI). SUMMARY OF BACKGROUND DATA DTI(More)
Reliable electromyography (EMG) thresholds for detecting medial breaches in the thoracic spine are lacking, and there is a paucity of reports evaluating this modality in patients with adolescent idiopathic scoliosis (AIS). This retrospective analysis evaluates the ability of triggered EMG to detect medial breaches with thoracic pedicle screws in patients(More)
BACKGROUND/OBJECTIVE The purpose of this study is to report the results of rater agreement for the International Standards for Neurological Classification of Spinal Cord Injury (ISCSCI) motor and sensory scores before and after training in the testing technique. METHODS Six raters performed sequential motor and sensory examinations on 5 adolescents with(More)
OBJECTIVE The purpose of the study was to further develop the psychometric rigor of the Grasp and Release Test (GRT), a hand function assessment designed to measure tendon transfer and functional electrical stimulation (FES) outcomes on functional limitation of individuals with tetraplegia. METHODS Nineteen participants (21 hands) between 7 and 20 years(More)
STUDY DESIGN Biomechanical study. OBJECTIVES This paper describes the biomechanical comparison of calf spines instrumented with a wedge alone versus a wedge-rod construct for the fusionless correction of scoliosis. SUMMARY OF BACKGROUND DATA Current techniques for the correction of scoliosis require either anterior or posterior spinal fusion for(More)
BACKGROUND/OBJECTIVE This study evaluated the effects of functional electrical stimulation (FES) applied to the muscles acting on the pelvis, hip, and knee on muscle strength, energy cost of walking, maximum walking distance and speed, step length and cadence, and joint kinematics during gait in 3 ambulatory adolescents with incomplete spinal cord injury(More)
PURPOSE We report a comparison study of vertebral body stapling (VBS) versus a matched bracing cohort for immature patients with moderate (25 to 44°) idiopathic scoliosis (IS). METHODS 42 of 49 consecutive patients (86%) with IS were treated with VBS and followed for a minimum of 2 years. They were compared to 121 braced patients meeting identical(More)