RTR lower extremity

Which tarsal bone is the keystone of the medial longitudinal arch?

• Calcaneus

• Talus
  

• Navicular

• Cuboid

The tuberosity on the 5th metatarsal serves as an attachment for which muscle?

• Tibialis posterior
  

• Fibularis brevis

• Extensor digitorum longus

• Gastrocnemius

What anatomical feature of the calcaneus forms the superior aspect of the sinus tarsi?

• Sustentaculum tali

• Trochlea

• Calcaneal sulcus

• Posterior tuberosity

The navicular bone articulates with how many bones? 

• 3

• 4

• 5

• 6

What is the primary reason for using a 15° posterior angulation in an AP axial projection of the toes?

• To prevent magnification

• To open interphalangeal joints

• To visualize the navicular clearly

• To reduce beam divergence

When performing a lateral projection of the 4th and 5th toes, which positioning maneuver ensures minimal superimposition?

• Using a 15° sponge

• Placing the foot in dorsiflexion

• Isolating toes with tape

• • Angling the CR 10° medially

In an AP medial oblique projection of the foot, what is the optimal rotation angle?

• 25°

• 30°

• 45°

• 50°

What is the key radiographic indicator of correct positioning for a lateral foot projection?

• Open interphalangeal joints

• Superimposed metatarsals

• Visibility of the calcaneal sulcus

• An open sinus tarsi

During an AP axial weight-bearing projection of the feet, why is a 10-15° posterior CR angulation used?

• To compensate for the arch curvature

• To visualize the talonavicular joint

• To reduce patient motion

• To separate the sesamoid bones

For a weight-bearing lateral foot projection, what positioning ensures the best evaluation of the longitudinal arch?

• CR perpendicular to the base of the 5th metatarsal

• Patient holding onto a support bar

• Weight distributed equally on both feet

• CR angulated 15° anteriorly