Estimation of Patient Specific Lumbar Spine Muscle Forces Using Multi-physical Musculoskeletal Model and Dynamic MRI

2014 ◽  
pp. 411-422 ◽  
Author(s):  
Tien Tuan Dao ◽  
Philippe Pouletaut ◽  
Fabrice Charleux ◽  
Áron Lazáry ◽  
Peter Eltes ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Dynamic Mri ◽  
Musculoskeletal Model ◽  
Patient Specific ◽  
Muscle Forces

Multimodal medical imaging (CT and dynamic MRI) data and computer-graphics multi-physical model for the estimation of patient specific lumbar spine muscle forces

2015 ◽  
Vol 96-97 ◽  
pp. 3-18 ◽  
Author(s):  
Tien Tuan Dao ◽  
Philippe Pouletaut ◽  
Fabrice Charleux ◽  
Áron Lazáry ◽  
Peter Eltes ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Medical Imaging ◽  
Computer Graphics ◽  
Physical Model ◽  
Dynamic Mri ◽  
Patient Specific ◽  
Muscle Forces

An improved multi-joint EMG-assisted optimization approach to estimate joint and muscle forces in a musculoskeletal model of the lumbar spine

2011 ◽  
Vol 44 (8) ◽  
pp. 1521-1529 ◽  
Author(s):  
Denis Gagnon ◽  
Navid Arjmand ◽  
André Plamondon ◽  
Aboulfazl Shirazi-Adl ◽  
Christian Larivière
Keyword(s):  
Lumbar Spine ◽  
Musculoskeletal Model ◽  
Optimization Approach ◽  
Muscle Forces

scholarly journals The Effects of External Loads and Muscle Forces on the Knee Joint Ligaments during Walking: A Musculoskeletal Model Study

2021 ◽  
Vol 11 (5) ◽  
pp. 2356
Author(s):  
Carlo Albino Frigo ◽  
Lucia Donno
Keyword(s):  
Knee Joint ◽  
Cruciate Ligament ◽  
Musculoskeletal Model ◽  
Optimization Approach ◽  
Muscle Forces ◽  
Collateral Ligaments ◽  
Flexion Extension ◽  
Lateral Collateral Ligaments ◽  
Gastrocnemius Muscles ◽  
External Loads

A musculoskeletal model was developed to analyze the tensions of the knee joint ligaments during walking and to understand how they change with changes in the muscle forces. The model included the femur, tibia, patella and all components of cruciate and collateral ligaments, quadriceps, hamstrings and gastrocnemius muscles. Inputs to the model were the muscle forces, estimated by a static optimization approach, the external loads (ground reaction forces and moments) and the knee flexion/extension movement corresponding to natural walking. The remaining rotational and translational movements were obtained as a result of the dynamic equilibrium of forces. The validation of the model was done by comparing our results with literature data. Several simulations were carried out by sequentially removing the forces of the different muscle groups. Deactivation of the quadriceps produced a decrease of tension in the anterior cruciate ligament (ACL) and an increase in the posterior cruciate ligament (PCL). By removing the hamstrings, the tension of ACL increased at the late swing phase, while the PCL force dropped to zero. Specific effects were observed also at the medial and lateral collateral ligaments. The removal of gastrocnemius muscles produced an increase of tension only on PCL and lateral collateral ligaments. These results demonstrate how musculoskeletal models can contribute to knowledge about complex biomechanical systems as the knee joint.

Predicting critical closing pressure in children with obstructive sleep apnea using fluid structure interaction simulations

2021 ◽  
Author(s):  
Goutham Mylavarapu ◽  
Ephraim Gutmark ◽  
Sally Shott ◽  
Robert J. Fleck ◽  
Mohamed Mahmoud ◽  
...  
Keyword(s):  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Upper Airway ◽  
Dynamic Mri ◽  
Patient Specific ◽  
Apnea Hypopnea Index ◽  
Structure Interaction ◽  
Obstructive Sleep ◽  
Mri Scans ◽  
Closing Pressure

Surgical treatment of obstructive sleep apnea (OSA) in children requires knowledge of upper airway dynamics, including the closing pressure (Pcrit), a measure of airway collapsibility. We applied a Flow-Structure Interaction (FSI) computational model to estimate Pcrit in patient-specific upper airway models obtained from magnetic resonance imaging (MRI) scans. We sought to examine the agreement between measured and estimated Pcrit from FSI models in children with Down syndrome. We hypothesized that the estimated Pcrit would accurately reflect measured Pcrit during sleep and therefore reflect the severity of OSA as measured by the obstructive apnea hypopnea index (AHI). All participants (n=41) underwent polysomnography and sedated sleep MRI scans. We used Bland Altman Plots to examine the agreement between measured and estimated Pcrit. We determined associations between estimated Pcrit and OSA severity, as measured by AHI, using regression models. The agreement between passive and estimated Pcrit showed a fixed bias of -1.31 (CI=-2.78, 0.15) and a non-significant proportional bias. A weaker agreement with active Pcrit was observed. A model including AHI, gender, an interaction term for AHI and gender and neck circumference explained the largest variation (R2 = 0.61) in the relationship between AHI and estimated Pcrit. (P <0.0001). Overlap between the areas of the airway with lowest stiffness, and areas of collapse on dynamic MRI, was 77.4%±30% for the nasopharyngeal region and 78.6%±33% for the retroglossal region. The agreement between measured and estimated Pcrit and the significant association with AHI supports the validity of Pcrit estimates from the FSI model.

Evaluation of Muscle Forces in a Synergistic Lumbar Spine Using Kinematics-Based Approach and Optimization

2001 ◽  
Author(s):  
A. Shirazi-Adl ◽  
M. El-Rich ◽  
D. Pop ◽  
M. Parnianpour
Keyword(s):  
Lumbar Spine ◽  
Load Distribution ◽  
Pelvic Tilt ◽  
Alternative Methods ◽  
Solution Technique ◽  
Muscle Forces ◽  
Optimal Load

Abstract Alternative methods have been proposed to solve the redundant problem of spinal active-passive load distribution. Due to the shortcomings in existing reduction, optimisation and EMG-driven models, and combination thereof, a novel kinematics-based approach is introduced that utilises the spinal passive-active synergy. Our recent studies demonstrate that, for a given task, the posture may be so adjusted as to yield an optimal load configuration requiring minimum muscle exertion [1]. In the current study, a solution technique for the redundant spinal system is described and applied to the analysis of a lumbar spine in an optimal posture obtained by varying the lordosis and pelvic tilt under a total of 2800N compression. The forces in lumbar muscles are subsequently computed for this optimal posture.

scholarly journals A computationally efficient strategy to estimate muscle forces in a finite element musculoskeletal model of the lower limb

2019 ◽  
Vol 84 ◽  
pp. 94-102 ◽  
Author(s):  
Alessandro Navacchia ◽  
Donald R. Hume ◽  
Paul J. Rullkoetter ◽  
Kevin B. Shelburne
Keyword(s):  
Finite Element ◽  
Lower Limb ◽  
Musculoskeletal Model ◽  
Muscle Forces ◽  
Computationally Efficient ◽  
Efficient Strategy

Validation of lumbar spine loading from a musculoskeletal model including the lower limbs and lumbar spine

2018 ◽  
Vol 68 ◽  
pp. 107-114 ◽  
Author(s):  
Jason A. Actis ◽  
Jasmin D. Honegger ◽  
Deanna H. Gates ◽  
Anthony J. Petrella ◽  
Luis A. Nolasco ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Musculoskeletal Model ◽  
Lower Limbs

scholarly journals An open-source musculoskeletal model of the lumbar spine and lower limbs: a validation for movements of the lumbar spine

2021 ◽  
pp. 1-16
Author(s):  
C. D. Favier ◽  
M. E. Finnegan ◽  
R. A. Quest ◽  
L. Honeyfield ◽  
A. H. McGregor ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Open Source ◽  
Musculoskeletal Model ◽  
Lower Limbs
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