Talus
Talus: also called the ankle bone, sits above the heel bone (calcaneus) and makes up the lower part of the ankle joint by connecting the tibia and fibula with the foot. Cuboid: a cube-shaped bone that connects the foot to the ankle and helps provide stability to the foot.
At what joint does dorsiflexion occur?
ankle joint
The ankle joint, also known as the talocrural joint, is a synovial joint that connects the bones of the leg, the fibula and tibia, with the talus of the foot. It is a complex hinge joint composed of two articulations….Ankle joint.
| Type | Synovial hinge joint; uniaxial |
|---|---|
| Movements | Dorsiflexion, plantar flexion |
What range of motion position is the ankle joint the least stable?
The least stable position of the talocrural joint is full plantar flexion. Full plantar flexion—the loose-packed position of the joint—slackens most of the collateral ligaments and all of the plantar flexor muscles.
What movement is dorsiflexion of the foot at the ankle joint?
The ankle or talocrural joint is formed from the tibia and fibula of the lower leg and talus of the foot. Functionally, it acts as a hinge, allowing dorsiflexion (pulling the foot upwards towards the lower leg) and plantarflexion (pulling the foot downwards away from the lower leg).
What joint does dorsiflexion and plantarflexion?
Overview. The ankle joint is a hinged synovial joint with primarily up-and-down movement (plantarflexion and dorsiflexion). However, when the range of motion of the ankle and subtalar joints (talocalcaneal and talocalcaneonavicular) is taken together, the complex functions as a universal joint (see the image below).
Is the ankle a stable joint?
The bony architecture of the ankle joint is most stable in dorsiflexion. Thus, a sprained ankle is more likely to occur when the ankle is plantar-flexed, as ligamentous support is more important in this position.
Why is the ankle most stable in dorsiflexion?
The talus is wider anteriorly and more narrow posteriorly. It forms a wedge that fits between the medial and lateral malleoli making dorsiflexion the most stable position for the ankle.
What joint does dorsiflexion and Plantarflexion?
Why are ankle joints stable in dorsiflexion?
The upper surface, called the trochlear surface, is somewhat cylindrical and allows for dorsiflexion and plantarflexion of the ankle. The talus is wider anteriorly and more narrow posteriorly. It forms a wedge that fits between the medial and lateral malleoli making dorsiflexion the most stable position for the ankle.
Is dorsiflexion or plantarflexion more stable?
What is the most unstable position of the ankle?
As the ankle moves into plantarflexion, the talus glides anteriorly and the ankle becomes less stable, which is why most ankle sprains involve some degree of plantarflexion as the mechanism. The ATFL is more parallel with the tibia in plantarflexion and thus more vulnerable in this position.
Why ankle joint is Triplanar?
Why is ankle joint motion considered triplanar? The joint axes are oblique and cut through all three planes of motion. The three motions of the ankle /foot complex, that approximate cardinal planes and axes are dorsiflexion/plantarflexion, inversion/eversion and abduction/adduction.
What muscles are involved in dorsiflexion of the ankle joint?
The tibialis anteriormuscle, found in the anterior compartment of the leg, is the primary muscle that facilitates dorsiflexion of the ankle joint. The peroneus longusand Peroneus Brevismuscles, found in the lateral compartment of the leg, function to facilitate eversion of the ankle joint. A complete listing of muscles are described below.
What is the normal range for dorsiflexion in the ankle?
The reported normal available range for dorsiflexion varies in the literature between 0-16.5 o and 0-25 o. This changes in weight bearing. Ottawa Ankle Rules to rule in/out radiography of the ankle after trauma.
What is the difference between dorsiflexion and plantarflexion?
Dorsiflexion – the anterior part of the talus is held in the mortise, and the joint is more stable. Plantarflexion – the posterior part of the talus is held in the mortise, and the joint is less stable.
What is the difference between dorsiflexion and tibialis anterior?
Dorsiflexion is the movement that occurs at the ankle where the foot lifted upwards. It is the opposite of plantar flexion, which is pointing the foot downwards as occurs when going up onto your toes. Tibialis anterior is the large muscles on the outside of the shin. It is the strongest dorsiflexor of the ankle.
