AI Article Synopsis
- The Salto-Talaris polyethylene surface was designed to restrict excessive motion while allowing some movement; this study investigates the contact characteristics between the polyethylene and talar components during various functional positions.
- Researchers scanned and digitally modeled the prosthesis to evaluate how the surfaces interacted during simulated walking by testing 15 different alignments of the components.
- The findings showed limited surface contact between the components, indicating uneven load distribution and potential concerns with increased contact pressures due to the incongruity of the surfaces.
Article Abstract
Background: The Salto-Talaris polyethylene articulating surface was designed to allow, but limit accessory motion. This investigation examines surface characteristics between the polyethylene bearing and anatomic talar component in various positions of function.
Methods: A Salto Talaris talar prosthesis and matching polyethylene bearing were scanned to create digital solid body models and manipulated to assess surface contact during simulated gait. With computer micromanipulation of the component positions, the surface intersections were recorded for 15 different alignments.
Results: The Salto Talaris has limited contact congruity with four points of contact in dorsiflexion, neutral, and plantarflexion. Lateral and medial translations showed only 2-point contact. The radii of curvatures between the talar component and polyethylene surfaces do not match. There was no sulcus contact yet component separation distance was small, suggesting increased loads.
Conclusion: Surface incongruency was measured based on computer model analysis which raises a concern of increased contact pressures.
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| http://dx.doi.org/10.1016/j.fas.2015.01.003 | DOI Listing |
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