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A Mouse Model of Ankle-Subtalar Complex Joint Instability
Published on: October 28, 2022
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Estimating the stabilizing function of ankle and subtalar ligaments via a morphology-specific three-dimensional
Emanuele Palazzi1, Sorin Siegler2, Vishnuvardhan Balakrishnan2
1Movement Analysis Laboratory, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy; Department of Industrial Engineering, University of Bologna, Italy; Department of Mechanical Engineering, Drexel University, Philadelphia, PA, USA.
Journal of Biomechanics
|October 27, 2019
Summary
Understanding ankle and subtalar ligament function is key for surgical repair. This study used subject-specific models to detail each ligament
Area of Science:
- Biomechanics
- Orthopedic Surgery
- Computational Modeling
Background:
- Ankle and subtalar ligamentous structures are crucial for joint stability.
- Current understanding of individual ligament contributions to stability remains incomplete.
- Improved knowledge can enhance clinical techniques like ligament repair and reconstruction.
Purpose of the Study:
- To investigate the specific stabilizing functions of ankle and subtalar ligaments.
- To quantify ligament contributions to joint stability using subject-specific computational models.
- To identify the impact of ligamentous injury on ankle and subtalar joint laxity.
Main Methods:
- Development of nine subject-specific computational models of the lower extremity from donor specimens.
- Simulation of cyclic moments applied to the calcaneus in a dynamic simulation program (ADAMS™).
- Analysis of bone displacement and ligament forces with intact and sectioned ligaments, validated against experimental data.
Main Results:
- Established the stabilizing role of individual ligaments: ATFL (supination), CFL (inversion, external rotation, dorsiflexion), PTFL (dorsiflexion, external rotation).
- Identified medial ligament functions: PTTL (dorsiflexion, internal rotation), ATTL (plantarflexion, external rotation), TCL (dorsiflexion, eversion, external rotation).
- Characterized subtalar joint ligament roles: ITCL (plantarflexion), posterior-lateral bundle (subtalar inversion), CL (multi-planar rotation and flexion/extension).
Conclusions:
- Subject-specific computational models are essential for accurately assessing ligamentous function due to significant inter-model variability.
- Detailed understanding of individual ligament roles provides critical data for improving surgical repair and reconstruction strategies.
- This study provides a comprehensive biomechanical map of ankle and subtalar ligament function, informing clinical practice.
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