|Publication type:||Conference other|
|Type of review:||Peer review (abstract)|
|Title:||Inclination of talocrural joint axis : in vitro studies and morphological considerations not confirmed in walking condition|
|Conference details:||XXVIII Congress of the International Society of Biomechanics, online, 25-29 July 2021|
|Subject (DDC):||610: Medicine and health|
|Abstract:||Summary: Knowledge about the orientation of the talocrural joint axis is limited to studies on tarsal morphology and quasistatic studies. Here, we determined the talocrural joint axis during walking. In contrast to literature, the mean axis was inclined upwards laterally during dorsiflexion while being inclined rather upwards medially in plantarflexion. Introduction: Already 70 years ago, the two different arcs and radii of the medial profile of the talus were used to highlight that the talocrural joint has no fixed axis of rotation. It was postulated that in talocrural dorsiflexion the axis of rotation is inclined upwards medially whereas in talocrural plantarflexion the axis of rotation is inclined upwards laterally. Subsequent studies confirmed this postulation in vitro, e.g., as well as (at least partly) in vivo. As related studies were either based on morphological data only or on data gained quasistatically, the aim of this study was to determine the orientation of the finite helical axis (FHA) of the talocrural joint during the stance phase of walking. Methods: Using intracortial pins, kinematics of the talus and tibia were recorded during self-paced walking of five participants. The FHA was determined  for a moving window of 10% stance phase and reported when the rotation was more than 2° to reduce the influence of noise. The mean helical axis was calculated for 15-30% stance phase, i.e. a phase known for talocrural dorsiflexion, and for 80-95% stance phase, i.e. a phase known for talocrural plantarflexion. Computer tomography of the bones was done while the pins were inserted to facilitate the visualization of the FHA. Results and Discussion: As expected, we could confirm that the talocrural joint acts not like a hinge joint with one single fixed axis of rotation. In contrast to existing literature, however, we observed that during a phase of talocrural dorsiflexion the axis of rotation was inclined upwards laterally and that in talocrural plantarflexion the axis turned more medially upwards. Conclusions: Although recent designs of ankle joint protheses have considered different inclinations for dorsi-/plantarflexion axes, their necessity could be justified differently than previously thought as in waking, we observed axes inclinations opposite to the expected ones.|
|Fulltext version:||Published version|
|License (according to publishing contract):||Licence according to publishing contract|
|Departement:||School of Health Sciences|
|Organisational Unit:||Institute of Physiotherapy (IPT)|
|Appears in collections:||Publikationen Gesundheit|
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