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Lower Extremity Procedures Flashcards

7 cards from real ARRT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Lower Extremity Procedures flashcards as text

  1. Which projection of the knee best demonstrates the fibular head free of superimposition over the tibia?

    Answer: Medial oblique projection

    The medial oblique (internal rotation) projection of the knee projects the fibular head free of tibial superimposition.

  2. For a lateral projection of the ankle, the patient's foot should be dorsiflexed to approximately what angle to place the long axis of the foot perpendicular to the leg?

    Answer: 90 degrees

    Dorsiflexing the foot to 90 degrees (a right angle to the leg) ensures a true lateral ankle projection without distortion.

  3. The AP axial projection of the foot (Béclère method) is used primarily to demonstrate which structure?

    Answer: Sesamoid bones of the great toe

    The Béclère method uses a tangential projection to visualize the sesamoid bones beneath the first metatarsophalangeal joint.

  4. When performing a bilateral weight-bearing AP projection of the knees for alignment assessment, the central ray is directed to:

    Answer: A point 1 inch below the apex of the patella at 5-7 degrees caudad

    For weight-bearing knee alignment, the CR is angled 5–7 degrees caudad directed to 1 inch below the patellar apex to open the joint space.

  5. For the lateral projection of the calcaneus, the central ray is directed:

    Answer: To the mid-calcaneus perpendicular to the IR

    For the calcaneus lateral, the CR is perpendicular to the IR directed to the mid-calcaneus to avoid distortion.

  6. Which projection of the hip demonstrates the femoral neck without foreshortening in a patient who cannot rotate their leg?

    Answer: Axiolateral inferosuperior (Danelius-Miller) projection

    The axiolateral inferosuperior (Danelius-Miller) projection allows imaging of the femoral neck in true profile when leg rotation is contraindicated.

  7. The tunnel (intercondylar fossa) projection of the knee is performed with the knee flexed approximately how many degrees?

    Answer: 40-45 degrees

    The tunnel (Camp-Coventry or Holmblad) projection requires 40–45 degrees of knee flexion to open the intercondylar fossa.