Finding line of action of the force exerted on erect spine based on lateral bending test in personalization of scoliotic spine models

Jalalian, Athena, Tay, Francis Eng Hock, Arastehfar, Soheil, Gibson, Ian and Liu, Gabriel 2017, Finding line of action of the force exerted on erect spine based on lateral bending test in personalization of scoliotic spine models, Medical & biological engineering & computing, vol. 55, no. 4, pp. 673-684, doi: 10.1007/s11517-016-1550-5.

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Title Finding line of action of the force exerted on erect spine based on lateral bending test in personalization of scoliotic spine models
Author(s) Jalalian, Athena
Tay, Francis Eng Hock
Arastehfar, Soheil
Gibson, IanORCID iD for Gibson, Ian
Liu, Gabriel
Journal name Medical & biological engineering & computing
Volume number 55
Issue number 4
Start page 673
End page 684
Total pages 12
Publisher Springer
Place of publication Berlin, Germany
Publication date 2017-04
ISSN 1741-0444
Keyword(s) lateral bending test
line of action
multi-body model
scoliotic spine
spine shape
Summary In multi-body models of scoliotic spine, personalization of mechanical properties of joints significantly improves reconstruction of the spine shape. In personalization methods based on lateral bending test, simulation of bending positions is an essential step. To simulate, a force is exerted on the spine model in the erect position. The line of action of the force affects the moment of the force about the joints and thus, if not correctly identified, causes over/underestimation of mechanical properties. Therefore, we aimed to identify the line of action, which has got little attention in previous studies. An in-depth analysis was performed on the scoliotic spine movement from the erect to four spine positions in the frontal plane by using pre-operative X-rays of 18 adolescent idiopathic scoliosis (AIS) patients. To study the movement, the spine curvature was considered as a 2D chain of micro-scale motion segments (MMSs) comprising rigid links and 1-degree-of-freedom (DOF) rotary joints. It was found that two MMSs representing the inflection points of the erect spine had almost no rotation (0.0028° ± 0.0021°) in the movement. The small rotation can be justified by weak moment of the force about these MMSs due to very small moment arm. Therefore, in the frontal plane, the line of action of the force to simulate the left/right bending position was defined as the line that passes through these MMSs in the left/right bending position. Through personalization of a 3D spine model for our patients, we demonstrated that our line of action could result in good estimates of the spine shape in the bending positions and other positions not included in the personalization, supporting our proposed line of action.
Language eng
DOI 10.1007/s11517-016-1550-5
Field of Research 090302 Biomechanical Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, International Federation for Medical and Biological Engineering
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Document type: Journal Article
Collection: School of Engineering
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