The Mechanics of the Ankle
The mechanics of the ankle are explored in detail, focusing on the forces acting on the foot in different positions. The tension in the Achilles tendon and the reaction force at the ankle joint are analyzed based on known relative positions. Various diagrams and solutions are provided to aid in understanding this biomechanical scenario.
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Presentation Transcript
The Mechanics of the Ankle EXAMPLE 4 Milan S. Kova evi Milan S. Kova evi Faculty of Science, Department of Physics University of Kragujevac Serbia e-mails: kovac@kg.ac.rs milan.kovacevic@pmf.kg.ac.rs Fo a, BiH, Fo a, BiH, 202 2022. 2.
A person standing on tiptoe on one foot Consider a person standing on tiptoe on one foot (a strenuous position illustrated). The forces acting on the foot during this instant are shown in Fig. 5.45 Fo a, BiH, Fo a, BiH, 202 2022. 2.
Mechanical model - description Wis the person s weight applied on the foot as the ground reaction force, FM is the magnitude of the tensile force exerted by the gastrocnemius and soleus muscles on the calcaneus through the Achilles tendon, and FJ is the magnitude of the ankle joint reaction force applied by the tibia on the dome of the talus. The weight of the foot is small compared to the weight of the body and is therefore ignored. The Achilles tendon is attached to the calcaneus at point A, the ankle joint center is located at point B, and the ground reaction force is applied on the foot at point C. For this position of the foot, it is estimated that the line of action of the tensile force in the Achilles tendon makes an angle with the horizontal, and the line of action of the ankle joint reaction force makes an angle with the horizontal. Fo a, BiH, Fo a, BiH, 202 2022. 2.
The task Assuming that the relative positions of points A, B, and C are known, determine expressions for the tension in the Achilles tendon and the magnitude of the reaction force at the ankle joint. Fo a, BiH, Fo a, BiH, 202 2022. 2.
The solution Fo a, BiH, Fo a, BiH, 202 2022. 2.
The Solution Fo a, BiH, Fo a, BiH, 202 2022. 2.
The Solution Fo a, BiH, Fo a, BiH, 202 2022. 2.
Thank you for your atention Thank you for your atention! ! Dr Milan Kova evi , Full Professor Faculty of Science, Department of Physics University of Kragujevac kovac@kg.ac.rs milan.kovacevic@pmf.kg.ac.rs Fo a, BiH, Fo a, BiH, 202 2022. 2.
