Ankle Analysis

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The medial mortise is obscured, the tibia and talus demonstrate increased superimposition of the fibula, and the posterior aspect of the medial malleolus is situated medial to the anterior aspect. Rotate the leg internally, placing the long axis of the foot in a vertical position.

For the following AP Ankle projection state which anatomic structures are misaligned and how the patient should be repositioned.

The talus is demonstrated without fibular superimposition. Externally rotate the leg until the long axis of the foot is vertical.

For the following AP Ankle projection state which anatomic structures are misaligned and how the patient should be repositioned.

The heel was depressed, and the forefoot was elevated.

For the following Lateral Ankle projection state how the patient would have been mispositioned: The tibiotalar joint is obscured, one talar dome is demonstrated anterior to the other dome, and the fibula is demonstrated too anterior on the tibia.

The foot is plantarflexed. Dorsiflex the foot until the long axis of the foot forms a 90-degree angle with the lower leg.

For the following Lateral Ankle projection state which anatomic structures are misaligned and how the patient should be repositioned.

The lateral talar dome is demonstrated distal to the medial dome, more than 1⁄2 inch (1.25 cm) of the cuboid is demonstrated posterior to the navicular, and the talocalcaneal joint is widened. Depress the distal lower leg until the lower leg is aligned parallel with the IR.

For the following Lateral Ankle projection state which anatomic structures are misaligned and how the patient should be repositioned.

The lateral talar dome is proximal to the medial dome. Less than 3⁄4 inch (2 cm) of the cuboid is demonstrated posterior to the navicular, and the talocalcaneal joint is narrowed. Elevate the distal lower leg until the lower leg is parallel with the IR.

For the following Lateral Ankle projection state which anatomic structures are misaligned and how the patient should be repositioned.

The leg and ankle were overrotated.

For the following Mortise Oblique Ankle projection state how the patient would have been mispositioned: The lateral and medial mortises are closed, and the tarsal sinus is demonstrated.

The distal tibia was elevated, or the CR was positioned distal to the joint space.

For the following Mortise Oblique Ankle projection state how the patient would have been mispositioned: The tibiotalar joint space is expanded, and the anterior tibial margin is projected superior to the posterior margin, and the tibial articulating surface is demonstrated.

The calcaneus is obscuring the distal aspect of the lateral mortise and the distal fibula. Dorsiflex the foot until its long axis forms a 90-degree angle with the lower leg.

For the following Mortise Oblique Ankle projection state which anatomic structures are misaligned and how the patient should be repositioned.

The lateral mortise is closed, the medial mortise is open, and the tarsal sinus is not demonstrated. Increase the degree of internal (medial) leg rotation until the most prominent aspects of the malleoli are positioned at equal distances from the IR.

For the following Mortise Oblique Ankle projection state which anatomic structures are misaligned and how the patient should be repositioned.

The proximal tibia was elevated, or the CR was centered too proximally.

How is the patient mispositioned for the following AP Ankle projection: The tibiotalar joint is closed, and the anterior tibial margin has been projected into the joint space.

tibiotalar joint

On a proper AP Ankle projection: The __________________ is at the center of the exposure field.

One-half

On a proper AP Ankle projection: The medial mortise is open, and the tibia superimposes _______ of the distal fibula.

open

On a proper AP Ankle projection: The tibiotalar joint space is _______, and the tibia is demonstrated without foreshortening.

Tibiotalar joint

On a proper Lateral Ankle projection: The _________________ is at the center of the exposure field.

Lower leg

On a proper Lateral Ankle projection: The long axis of the foot is positioned at a 90° angle with the _______________.

A. open B. distal tibia

On a proper Lateral Ankle projection: The talar domes are superimposed, the tibiotalar joint is (A)______________, and the distal fibula is superimposed by the posterior half of the (B)___________.

tibiotalar joint

On a proper Mortise Oblique Ankle projection: The ________________ is at the center of the exposure field.

Distal

On a proper Mortise Oblique Ankle projection: The calcaneus is visualized _________ to the lateral mortise and fibula

A. Talar B. Lateral C. Distal fibula

On a proper Mortise Oblique Ankle projection: The distal fibula is demonstrated without (A) __________ superimposition, demonstrating an open (B)___________ mortise, and the lateral and medial malleoli are in profile. The tibia superimposes one-fourth of the (C)_____________.


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