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3D foot joints angle description using projected lines on anatomical planes

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Since it is hardly possible to have LCS based on three rigid markers per foot segment, many of standard joint angle description methods (e.g. JCS) might not be suitable for many foot joints... Recently, Simon et al proposed a new foot joint angle description where each joint angle is defined by the rotation angle between two lines corresponding to two segments about a rotation axis on the third segment... The defined joint angle is equal with the angle between projections of two lines on the normal plane of the rotation axis... The results were repeatable and reliable... We proposed to define all foot joint angles by projection on three common anatomical planes... For similar angles, repeatability and sensitivity to measurement errors were showed to be in the same range as other angle representation methods... A method to describe 3D angles of foot joints was suggested with an easy clinical interpretation... Without use of LCS, the method had also the similar performance as other conventions... Yet, the movement of foot's anatomical planes can induce error which can be avoided by definition of rotation axis on the same joint segments and not others... The suitability of method will be soon assessed in clinical applications.

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Definition of calcaneus-metatarsals joint angles: a) Lines defined for sagittal projection b) Lines defined for coronal projection.
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Figure 1: Definition of calcaneus-metatarsals joint angles: a) Lines defined for sagittal projection b) Lines defined for coronal projection.

Mentions: Sagittal, coronal and transverse planes of whole foot were defined based on [3]. For each considered foot joint, one line per each of two segments bounding the joint was defined between captured anatomical landmarks (AL). As an example, Figure 1 depicts this method for the case of angle calculation for the considered joint between calcaneus and metatarsals.


3D foot joints angle description using projected lines on anatomical planes
Definition of calcaneus-metatarsals joint angles: a) Lines defined for sagittal projection b) Lines defined for coronal projection.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2562112&req=5

Figure 1: Definition of calcaneus-metatarsals joint angles: a) Lines defined for sagittal projection b) Lines defined for coronal projection.
Mentions: Sagittal, coronal and transverse planes of whole foot were defined based on [3]. For each considered foot joint, one line per each of two segments bounding the joint was defined between captured anatomical landmarks (AL). As an example, Figure 1 depicts this method for the case of angle calculation for the considered joint between calcaneus and metatarsals.

View Article: PubMed Central - HTML

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

Since it is hardly possible to have LCS based on three rigid markers per foot segment, many of standard joint angle description methods (e.g. JCS) might not be suitable for many foot joints... Recently, Simon et al proposed a new foot joint angle description where each joint angle is defined by the rotation angle between two lines corresponding to two segments about a rotation axis on the third segment... The defined joint angle is equal with the angle between projections of two lines on the normal plane of the rotation axis... The results were repeatable and reliable... We proposed to define all foot joint angles by projection on three common anatomical planes... For similar angles, repeatability and sensitivity to measurement errors were showed to be in the same range as other angle representation methods... A method to describe 3D angles of foot joints was suggested with an easy clinical interpretation... Without use of LCS, the method had also the similar performance as other conventions... Yet, the movement of foot's anatomical planes can induce error which can be avoided by definition of rotation axis on the same joint segments and not others... The suitability of method will be soon assessed in clinical applications.

No MeSH data available.