Spinal Cord Stress and Strain Predictions in a Ligamentous C5-C6 Segment

2000 ◽  
Author(s):  
J. Scifert ◽  
K. Totoribe ◽  
V. Goel ◽  
C. Clark ◽  
J. Reinhardt ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Cervical Spinal Cord ◽  
Experimental Studies ◽  
Stress And Strain ◽  
Fe Model ◽  
Spinal Disorders ◽  
Significant Damage ◽  
Cord Injury ◽  
Bony Segment

Abstract Several spinal disorders and traumatic loading situations are known to inflict damage to neurovascular components of the cervical spinal cord. Studies have shown that damage to the spinal cord can occur regardless of significant damage to surrounding structures. To understand the mechanics of spinal cord injury, one needs to quantify stresses and strains within the spinal cord and its components in response to exterrnal loads applied to the bony spine. Experimental studies can not address this issue. This study presents a Finite Element (FE) model to quantify the physiologic strains and stresses in the cervical spinal cord placed in the ligamentous C5-C6 motion segment, with loads applied to the bony segment and not the the cord itself, as have been done in experimental studies reported in the literature.

scholarly journals Restoration of breathing after opioid overdose and spinal cord injury using temporal interference stimulation

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Michael D. Sunshine ◽  
Antonino M. Cassarà ◽  
Esra Neufeld ◽  
Nir Grossman ◽  
Thomas H. Mareci ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Motor Neurons ◽  
Drug Overdose ◽  
Cervical Spinal Cord ◽  
Opioid Overdose ◽  
Electrode Position ◽  
Spinal Motor Neurons ◽  
Cord Injury ◽  
Low Amplitude

AbstractRespiratory insufficiency is a leading cause of death due to drug overdose or neuromuscular disease. We hypothesized that a stimulation paradigm using temporal interference (TI) could restore breathing in such conditions. Following opioid overdose in rats, two high frequency (5000 Hz and 5001 Hz), low amplitude waveforms delivered via intramuscular wires in the neck immediately activated the diaphragm and restored ventilation in phase with waveform offset (1 Hz or 60 breaths/min). Following cervical spinal cord injury (SCI), TI stimulation via dorsally placed epidural electrodes uni- or bilaterally activated the diaphragm depending on current and electrode position. In silico modeling indicated that an interferential signal in the ventral spinal cord predicted the evoked response (left versus right diaphragm) and current-ratio-based steering. We conclude that TI stimulation can activate spinal motor neurons after SCI and prevent fatal apnea during drug overdose by restoring ventilation with minimally invasive electrodes.

scholarly journals An Inertial Measurement Unit-Based Wireless System for Shoulder Motion Assessment in Patients with Cervical Spinal Cord Injury: A Validation Pilot Study in a Clinical Setting

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1057
Author(s):  
Riccardo Bravi ◽  
Stefano Caputo ◽  
Sara Jayousi ◽  
Alessio Martinelli ◽  
Lorenzo Biotti ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Clinical Setting ◽  
Cervical Spinal Cord ◽  
Wearable Sensors ◽  
Cervical Spinal Cord Injury ◽  
Measurement Unit ◽  
Innovative Technology ◽  
Inertial Measurement ◽  
Cord Injury

Residual motion of upper limbs in individuals who experienced cervical spinal cord injury (CSCI) is vital to achieve functional independence. Several interventions were developed to restore shoulder range of motion (ROM) in CSCI patients. However, shoulder ROM assessment in clinical practice is commonly limited to use of a simple goniometer. Conventional goniometric measurements are operator-dependent and require significant time and effort. Therefore, innovative technology for supporting medical personnel in objectively and reliably measuring the efficacy of treatments for shoulder ROM in CSCI patients would be extremely desirable. This study evaluated the validity of a customized wireless wearable sensors (Inertial Measurement Units—IMUs) system for shoulder ROM assessment in CSCI patients in clinical setting. Eight CSCI patients and eight healthy controls performed four shoulder movements (forward flexion, abduction, and internal and external rotation) with dominant arm. Every movement was evaluated with a goniometer by different testers and with the IMU system at the same time. Validity was evaluated by comparing IMUs and goniometer measurements using Intraclass Correlation Coefficient (ICC) and Limits of Agreement (LOA). inter-tester reliability of IMUs and goniometer measurements was also investigated. Preliminary results provide essential information on the accuracy of the proposed wireless wearable sensors system in acquiring objective measurements of the shoulder movements in CSCI patients.

scholarly journals Permanent diaphragmatic deficits and spontaneous respiratory plasticity in a mouse model of incomplete cervical spinal cord injury

2021 ◽  
Vol 284 ◽  
pp. 103568
Author(s):  
Pauline Michel-Flutot ◽  
Arnaud Mansart ◽  
Therese B. Deramaudt ◽  
Isley Jesus ◽  
Kun-Ze Lee ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Mouse Model ◽  
Cervical Spinal Cord ◽  
Cervical Spinal Cord Injury ◽  
Cord Injury ◽  
Respiratory Plasticity

scholarly journals Trending Racial and Socioeconomic Inequality in the Surgical Management and Outcome of Traumatic Cervical Spinal Cord Injury With Fracture In the USA From 1998 to 2009

Neurosurgery ◽  
2019 ◽  
Vol 66 (Supplement_1) ◽  
Author(s):  
Alexander Dru ◽  
Dan Neal ◽  
W Christopher Fox ◽  
Brian Lim Hoh ◽  
Daniel J Hoh
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Socioeconomic Status ◽  
Hospital Mortality ◽  
Cervical Spinal Cord ◽  
Cervical Spinal Cord Injury ◽  
Lower Odds ◽  
Discharge Disposition ◽  
Treatment Type ◽  
Cord Injury

Abstract INTRODUCTION Advances in treatment of traumatic cervical spinal cord injury with fracture (TCSCIF) have led to significant improvements in clinical outcomes; however, progress in healthcare is seldom ubiquitous across demographic groups. We explored if disparities in treatment and outcome after TCSCIF exist across race and socioeconomic status. METHODS We queried the Nationwide Inpatient Sample database from 1998 to 2009 for TCSCIF hospitalizations. Multivariate analysis was used to identify the correlation between socioeconomic status and race to treatment type and outcome. RESULTS There were 21 985 admissions for TCSCIF. In all 66.9% had a favorable discharge disposition. In-hospital mortality rate was 12.5%. In all 43.7% underwent surgery. Overall, surgery was associated with lower in-hospital mortality (OR 0.30, 95% CI 0.27-0.34, P < .01) and better discharge disposition (OR 0.68, 95% CI 0.62-0.74, P < .01) vs nonsurgical or no intervention. Controlling for race and socioeconomic status demonstrated higher status (HS) non-Caucasians had lower odds of receiving surgery than HS Caucasians (OR 0.89, 95% CI 0.81-0.97, P = .01). LSES non-Caucasians had lower odds of receiving surgery than HS Caucasians (OR 0.83, 95% CI 0.73-0.94, P < .01). HS non-Caucasians had lower odds of receiving surgery than LSES Caucasians (OR 0.87, 95% CI 0.77-0.99, P = .03). LSES non-Caucasians had lower odds of receiving surgery than LSES Caucasians (OR 0.82, 95% CI 0.71-0.94, P = .01). For favorable discharge status HS non-Caucasians, LSES non-Caucasians, and LSES Caucasians all had lower odds of favorable discharge compared to HS Caucasians (OR 0.83, 95% CI 0.73-0.95, P = .01/OR 0.69, 95% CI 0.59-0.81, P < .01/OR 0.75, 95% CI 0.66-0.85, P < .01), respectively. CONCLUSION In our multivariate model that controlled for race and socioeconomic status in the setting of TCSCIF, race (but not socioeconomic status) was a factor in receiving surgery and both race and LSES impacted favorable discharge.

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