Prediction of in vivo lower cervical spinal loading using musculoskeletal multi-body dynamics model during the head flexion/extension, lateral bending and axial rotation

Diao, Hao; Hua, Xueming; Zhang, Jin

doi:10.1177/0954411918799630

Cited by 10 publications

(10 citation statements)

References 44 publications

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“…This working posture, especially the neck flexion, causes a 1.6-fold increase in cervical disc compression and a four-fold increase in anteroposterior shear at a posture of 45° compared to the neutral position [ 36 ]. Thus, these increases in cervical disc compression and shear forces during flexion, lateral flexion, and rotational movements must also be taken into account [ 37 , 38 ]. In the present analysis, the ERPs show that in the neck area, in all DWCs, between 55–59% of the working time was spent in the maximum possible RULA score.…”

Section: Discussionmentioning

confidence: 99%

Ergonomic Comparison of Four Dental Workplace Concepts Using Inertial Motion Capture for Dentists and Dental Assistants

Ohlendorf

Fraeulin

Haenel

et al. 2021

IJERPH

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When the inventory is arranged in a dental practice, a distinction can be made between four different dental workplace concepts (DWCs). Since the prevalence of musculoskeletal diseases in dental professionals is very high, preventive solution need to be investigated. As the conventionally used DWCs have, to date, never been studied in terms of their ergonomics, this study aims to investigate the ergonomic risk when working at the four different DWCs. In total, 75 dentists (37 m/38 f) and 75 dental assistants (16 m/59 f) volunteered to take part in this study. Standardized cooperative working procedures were carried out in a laboratory setting and kinematic data were recorded using an inertial motion capture system. The data were applied to an automated version of the Rapid Upper Limb Assessment (RULA). Comparisons between the DWCs and between the dentists and dental assistants were calculated. In all four DWCs, both dentists and dental assistants spent 95–97% of their working time in the worst possible RULA score. In the trunk, DWCs 1 and 2 were slightly favorable for both dentists and dental assistants, while for the neck, DWC 4 showed a lower risk score for dentists. The ergonomic risk was extremely high in all four DWCs, while only slight advantages for distinct body parts were found. The working posture seemed to be determined by the task itself rather than by the different inventory arrangements.

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Section: Discussionmentioning

confidence: 99%

Ergonomic Comparison of Four Dental Workplace Concepts Using Inertial Motion Capture for Dentists and Dental Assistants

Ohlendorf

Fraeulin

Haenel

et al. 2021

IJERPH

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“…It is well known that human joints (e.g., intervertebral disc) face multi-directional dynamic loading combined with coupling rotations [33]. The actual motion track can be either oval like (in vitro) or curvilinear typed (in vivo) [34].…”

Section: Worn Surface Analysismentioning

confidence: 99%

Bio‐tribological characterisation of ultra‐high molecular weight polyethylene against different metal counterparts

Hua

Liang

Zhang

et al. 2022

Biosurface and Biotribology

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Excessive wear is a key issue affecting the performance of ultra‐high molecular weight polyethylene (UHMWPE)‐based artificial prosthesis. This work is focussed on the bio‐tribology behaviours of UHMWPE when mating with different metal counterparts (iron‐based 316L, Co‐based Stellite‐S21 and Stellite‐S22). According to the ASTM F732 standard, two million cycles comparative wear tests were carried out under bovine serum lubrication. When coupled with S21, S22, and 316L metal counterparts, the obtained average wear factors of UHMWPE were 1.333 ± 0.192, 1.360 ± 0.160, and 1.190 ± 0.177 × 10−6 mm3/N · m, respectively. Initial surface roughness of the metal counterpart has shown an important role in controlling the volume of UHMWPE wear, especially the first one million cycles. Compared with 316L, CoCrMo‐based counterparts possessed relative higher hardness and exhibited less rise in surface roughness caused by wear. For UHMWPE‐on‐metal bearings, random scratch, surface pit, and wear debris attachment were commonly seen, which suggested the coexistence of abrasion, third‐body abrasion, and adhesion‐based wear. In contrast, the metal counterpart was slightly scratched with no polymer transfer film formation. The work conducted in the present study gives useful knowledge regarding the UHMWPE‐on‐metal bearing design. With an intention to minimise wear, surface roughness of metal counterpart should be carefully controlled.

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“…As an alternative, computational models combined with accurate anatomical data have been introduced to obtain valuable joint mechanics. The cervical spinal loading patterns during various head movements have been estimated by the musculoskeletal (MSK) model, based on the multi-body dynamics (MBD) method [17]. However, the obtained cervical spinal loading patterns, such as compressive forces (CFs), shear forces (SFs), and facet joint forces (FJFs), only represent the normal subject (NS) [17].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Cervical Spinal Loading and Internal Motion at Adjacent Segments after C5–C6 Fusion Using a Musculoskeletal Multi-Body Dynamics Model during the Head Flexion–Extension Movement

Diao,

Xin,

Jin

2023

Applied Sciences

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Cervical spinal fusion is the standard of care for treating intractable spinal diseases. However, frequent adjacent segment disease (ASD) has recently drawn a great deal of attention among clinicians and researchers. At present, the etiology of ASD remains controversial. The investigation of cervical spine biomechanics after fusion may contribute to understanding the causes of ASD. In the present study, a cervical spinal musculoskeletal fusion model, with multi-body dynamics method, was established. Dynamic head flexion–extension movements were simulated for both a fusion subject and a normal subject. The cervical spinal loading pattern, load sharing ratios, and translations of instant centers of the rotation at adjacent segments were then predicted. The average intervertebral compressive forces, shear forces, and facet joint forces against the intervertebral angle were also obtained. By comparison, some obvious differences in cervical spinal loading patterns were found between the fusion subject and the normal subject. Fusion surgery would alter the postoperative biomechanical surrounding of the cervical spine, especially the adjacent segments. These changes might affect the intervertebral disc-bearing capacity, and even weaken the physiological structure. From a purely biomechanical perspective, the cervical spinal fusion model can contribute to comprehending the etiology of ASD after spinal fusion.

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Prediction of in vivo lower cervical spinal loading using musculoskeletal multi-body dynamics model during the head flexion/extension, lateral bending and axial rotation

Cited by 10 publications

References 44 publications

Ergonomic Comparison of Four Dental Workplace Concepts Using Inertial Motion Capture for Dentists and Dental Assistants

Ergonomic Comparison of Four Dental Workplace Concepts Using Inertial Motion Capture for Dentists and Dental Assistants

Bio‐tribological characterisation of ultra‐high molecular weight polyethylene against different metal counterparts

Estimation of Cervical Spinal Loading and Internal Motion at Adjacent Segments after C5–C6 Fusion Using a Musculoskeletal Multi-Body Dynamics Model during the Head Flexion–Extension Movement

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