Mechanical and functional assessment of the wrist affected by rheumatoid arthritis: A finite element analysis

Bajuri, Mohd Nazri; Kadir, Mohammed Rafiq Abdul; Murali, Malliga Raman; Kamarul, Tunku

doi:10.1016/j.medengphy.2011.12.020

Cited by 42 publications

(33 citation statements)

References 47 publications

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“…The ligaments were modeled as linear springs. As reported in the previous studies, the use of linear links to simulate ligaments was found to be adequate [17,18]. As no study was found to report the stiffness of ligament in the infant foot, we defined the stiffness of infant foot ligaments based on the adult stiffness in foot ligament and multiple relationships calculated from the research of mechanical properties of cervical spine ligaments between a 14-yearold child and newborn baby [19,20].…”

Section: Materials Propertiesmentioning

confidence: 99%

Effect of Achilles tendon on kinematic coupling relationship between tarsal bones: a pilot finite element study

Tang

Zhao³

et al. 2020

J Orthop Surg Res

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Background: The procedure of percutaneous Achilles tenotomy (PAT) is an important component of the Ponseti method. However, few studies reported the influence of Achilles tendon on kinematic coupling relationship between tarsal bones. The purpose of present study was to demonstrate the effect of Achilles tendon on the kinematic coupling relationship between tarsal bones, and to illustrate how kinematic coupling relationship between tarsal bones works in term of finite element analysis. Methods: A three-dimensional finite element model of foot and ankle was constructed based on the Chinese digital human girl No.1 (CDH-G1) image database using the software of mimics, Geomagic studio, HyperMesh, and Abaqus. The last manipulation of the Ponseti method before the procedure of PAT was simulated. The talus head and the proximal tibia and fibula bone were fixed in all six degrees of freedom, and the outward pressure was added on the first metatarsal head to investigate the kinematic coupling relationship between tarsal bones. Results: The least relationship of kinematic coupling between tarsal bones was found in calcaneus. Stress concentration was mainly observed at the navicular, talus and the medial malleolus. The difference in displacement of the navicular was only found with the Achilles tendon stiffness of 0 N/mm and others. No difference in the navicular displacement was found in the stiffness of Achilles tendon between 40, 80, 200, 400, and 1000 N/mm. The maximum displacement of navicular was observed at the ankle position of PF-20°(plantar flexion-20°). The difference in displacement of the navicular was greater at the ankle position of PF-20°with the Achilles tendon stiffness of 0 N/mm than that at the ankle position of PF-40°with the Achilles tendon stiffness of 40 N/mm. Conclusions: Based on the findings from this study, it was demonstrated that the Achilles tendon existence or not and ankle position had great influence, while increased stiffness of Achilles tendon had no influence on kinematic coupling relationship between tarsal bones. For the cases with severe equinus, earlier implementation of PAT procedure (with the purpose of release the Achilles tendon and reduce the degree of ankle plantar flexion) may be beneficial to the deformity correction.

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Section: Materials Propertiesmentioning

confidence: 99%

Effect of Achilles tendon on kinematic coupling relationship between tarsal bones: a pilot finite element study

Tang

Zhao³

et al. 2020

J Orthop Surg Res

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“…All the structures are assumed to be elastic, isotropic and homogeneous. Based on published experimental data [27][28][29][30][31][32] , the elastic modulus of skin is 0. In the test, four willow splints with the same size were selected.…”

Section: Materials Propertiesmentioning

confidence: 99%

Numerical Modeling of Rehabilitation Exercise when Distal Radius Fracture Treated by Splint

Hua

Liu

et al. 2020

Preprint

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Background Rehabilitation exercise plays a key role in bone fracture healing. Although traditional clinical experiments and observations are adopted to evaluate the effect of rehabilitation exercise, the biomechanical mechanism is still unclear. There are few reports on the mechanical analysis model of elbow flexion rehabilitation exercise of the complete upper limb model previously. Because the upper limb structure is complex, the previous model is so simplified that soft tissue structure is not considered. It cannot reflect the change and distribution of the stress and stress state during elbow flexion exercise. Methods From the perspective of biomechanics, based on the CT scanning images of forearm for an aged female volunteer, a 3-D distal radius fracture forearm model is established. By introducing the soft tissues and the splint, a complete 3-D forearm model is finally reconstructed. The model includes ulna, radius, humerus, muscle, ligament, joint, wrist, skin and splint. The correctness of the model is verified by comparing the results of numerical simulation with the results of previous literature and clinical experiments. Results When the elbow flexion angle increases from 0 to 120 degrees, the stress increases from 0.21 Mpa to 0.83 Mpa. When the elbow flexion angle increases from 0 to 120 degrees, the strain increases from 2–23%, and the maximum strain at the fracture end is about 22.5%. Also an analytical formula of the relationship fracture end strain and different elbow flexion angles is obtained by nonlinear fitting based on the simulation results, which is convenient for clinicians to predict fracture end strain. Conclusions During elbow flexion rehabilitation exercise, the stress of biceps brachii is large, and with the increase of elbow flexion angle, the stress shows an increasing trend. The stress in the area of distal radius fracture is also concentrated. Moderate stress concentration is helpful to the process of bone remodeling, so as to shorten the time of fracture healing. There was no obvious stress concentration in metacarpal bone and has little effect on the activity of metacarpophalangeal joint. The fretting strain at the fracture site can improve the speed of fracture healing, because the generation of early callus can absorb a lot of energy generated by fretting strain, which has an impact on the mechanical properties and plastic deformation ability of callus, and plays an important role in the stimulation of late osteogenesis.

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“…These joint injuries associated with the progression of the disease can increase the degenerative process of the joints, promoting greater structural changes on them, which favors more movement and activity changes [9]. These manifestations alter the accomplishment of the daily living and labor activities, being related to social aspects and daily life, facts that directly impact on the quality of life of the subjects, impairing their psychosocial aspects [10,11].…”

Section: Introductionmentioning

confidence: 99%

Low level laser therapy for reducing pain in rheumatoid arthritis and osteoarthritis: a systematic review

et al. 2019

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Introduction: Treatments for rheumatoid arthritis (RA) and osteoarthritis (OA) can reduce, modulate inflammation, and reduce deformities. Low-Level Laser Therapy is a biomodulator and may aid in the clinical picture of these conditions. Objective: To analyze the parameters most frequently used to determine the responses of patients with RA and OA in controlled and uncontrolled clinical trials. Method: This is a systematic review with search of articles in English, Portuguese and Spanish in PUBMED, SCOPUS, LILACS and Web of SCIENCE, of articles published between 2006 and 2018. MeSH terms were used. Inclusion criteria: evaluation of LLLT in the evaluations, evaluation and evaluation of the period, controlled and uncontrolled clinical trials, full publications. The base date of the energy dosimetry and the analysis of mean, median and mode of energy per point and energy per treatment. Results: Three articles on RA and 16 on OA were included in this study. Regarding dosimetry, it was one of the most recent of the pain, being this one with a greater energy dose. In OA, most of the articles presented are of importance, with variability in the dosage applied. Conclusion: There are several reports for patient studies purposes, mainly with doses of 6 J per point and 48 J. In the joints affected with OA and AR, it would be important to publish more scientific articles with better methodological quality and description of dosimetry.

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Mechanical and functional assessment of the wrist affected by rheumatoid arthritis: A finite element analysis

Cited by 42 publications

References 47 publications

Effect of Achilles tendon on kinematic coupling relationship between tarsal bones: a pilot finite element study

Effect of Achilles tendon on kinematic coupling relationship between tarsal bones: a pilot finite element study

Numerical Modeling of Rehabilitation Exercise when Distal Radius Fracture Treated by Splint

Low level laser therapy for reducing pain in rheumatoid arthritis and osteoarthritis: a systematic review

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