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Questions and Answers
Which combination of movements is associated with plantar flexion at the talocrural joint?
What is the main component movement that occurs during the pronation of the talocrural joint?
In the context of the talocrural joint, which axis is primarily associated with the movements of dorsiflexion and plantar flexion?
What movement occurs at the talocrural joint when the toes are pointed away from the body?
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What type of motion can be expected during slight abduction at the talocrural joint?
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Which statement accurately describes the axis of rotation at the talocrural joint?
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In passive plantar flexion of the talocrural joint, which anatomical structure plays a pivotal role in facilitating the movement?
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What is the primary arthrokinematic motion at the talocrural joint during dorsiflexion?
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Which of the following ligaments is least involved during passive plantar flexion at the talocrural joint?
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Study Notes
Talocrural Joint
- The talocrural joint is the ankle joint, it is formed by the articulation between the distal tibia and fibula and the talus.
- The primary axis of rotation at the talocrural joint is slightly oblique, and not perfectly medial-lateral (ML).
- While the main motions at the talocrural joint are dorsiflexion and plantar flexion, there are also subtle components of abduction/adduction and eversion/inversion.
- Dorsiflexion is accompanied by a slight abduction and eversion, which are components of pronation.
- Plantar flexion is accompanied by a slight adduction and inversion, which are components of supination.
- The talocrural joint's 0-degree (neutral) position occurs at the foot's 90° angle with the leg.
Arthrokinematics
- During dorsiflexion, the talus rolls anteriorly and glides posteriorly.
- During plantar flexion, the talus rolls posteriorly and glides anteriorly.
- The talus spins on a slightly off-center axis, causing a small amount of abduction/adduction and eversion/inversion, contributing to the pronation and supination motions.
- The talocrural joint can move 15 to 25 degrees of dorsiflexion and 40 to 55 degrees of plantar flexion.
- Accessory movements in other foot joints (not the talocrural joint) can account for up to 20-30% of the total range of motion.
Talocrural Joint Structures
- The talocrural joint is supported by ligaments: anterior talofibular ligament (ATFL), calcaneofibular ligament (CFL), posterior talofibular ligament (PTFL), and the deltoid ligament (medial ligament).
- The Achilles tendon is attached to the calcaneus, and its contraction causes plantar flexion of the foot.
- The anterior and posterior capsules of the talocrural joint contribute to joint stability.
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Description
Test your knowledge on the talocrural joint, its structure, and movements. This quiz covers key concepts such as dorsiflexion, plantar flexion, and the arthrokinematic motion of the talus. Understanding these principles is essential for studying ankle biomechanics.
