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Assessing talonavicular joint rotations in three dimension

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As such, the talonavicular joint should be expected to demonstrate three rotational degrees of freedom... A new approach, and perspective, is adopted that permits an appreciation of the talonavicular joint that is not restricted to the confines of marker dependence or the orthogonal reference frame... Each specimen was cycled through three mutually orthogonal driving actions (Plantarflexion-Dorsiflexion [PD], Inversion-Eversion [IE], and Medial-Lateral Rotation [ML]) while monitoring the relative positions of the talus and navicular with an active-marker tracking system The Functional Alignment method was used to derive joint axis orientations and motion patterns for three rotational degrees of freedom... These results are summarized using the axis triangle technique... Figure 2 compares the mobility-size assessment of total joint mobility observed in the three driving motions for each subject... Although the talonavicular joint is shown to be most mobile in response to the IE driving motion, in many instances the mobility-size values associated with the other driving motions are nearly as high... This suggests that the talonavicular movement is not restricted to, or even mostly associated with, a single action of the foot... The talonavicular joint is a true three degree of rotational freedom joint... It responds in unique ways to different driving inputs... To identify and understand these differences, it is necessary to adopt a perspective that is not limited to movements aligned with an orthogonal reference frame.

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The consensus axis triangles associated with the three evaluated driving actions.
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Figure 1: The consensus axis triangles associated with the three evaluated driving actions.

Mentions: Figure 1 shows consensus (average) axis triangle representations for the three driving motions. The position of each vertex (axis point) along with its distance from the reference frame origin denotes the orientation of the rotational axis and the movement that occurs about it. The sizes and shapes of the three different triangles indicate that the talonavicular joint responds differently to each driving action. None of the vertices of these axis triangles lies on the axes of the reference frame, which indicates that every rotational axis of this joint has a highly oblique orientation.


Assessing talonavicular joint rotations in three dimension
The consensus axis triangles associated with the three evaluated driving actions.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2562133&req=5

Figure 1: The consensus axis triangles associated with the three evaluated driving actions.
Mentions: Figure 1 shows consensus (average) axis triangle representations for the three driving motions. The position of each vertex (axis point) along with its distance from the reference frame origin denotes the orientation of the rotational axis and the movement that occurs about it. The sizes and shapes of the three different triangles indicate that the talonavicular joint responds differently to each driving action. None of the vertices of these axis triangles lies on the axes of the reference frame, which indicates that every rotational axis of this joint has a highly oblique orientation.

View Article: PubMed Central - HTML

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

As such, the talonavicular joint should be expected to demonstrate three rotational degrees of freedom... A new approach, and perspective, is adopted that permits an appreciation of the talonavicular joint that is not restricted to the confines of marker dependence or the orthogonal reference frame... Each specimen was cycled through three mutually orthogonal driving actions (Plantarflexion-Dorsiflexion [PD], Inversion-Eversion [IE], and Medial-Lateral Rotation [ML]) while monitoring the relative positions of the talus and navicular with an active-marker tracking system The Functional Alignment method was used to derive joint axis orientations and motion patterns for three rotational degrees of freedom... These results are summarized using the axis triangle technique... Figure 2 compares the mobility-size assessment of total joint mobility observed in the three driving motions for each subject... Although the talonavicular joint is shown to be most mobile in response to the IE driving motion, in many instances the mobility-size values associated with the other driving motions are nearly as high... This suggests that the talonavicular movement is not restricted to, or even mostly associated with, a single action of the foot... The talonavicular joint is a true three degree of rotational freedom joint... It responds in unique ways to different driving inputs... To identify and understand these differences, it is necessary to adopt a perspective that is not limited to movements aligned with an orthogonal reference frame.

No MeSH data available.