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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. A patient presents with a suspected Lisfranc injury. Which projection of the foot is most useful for initial evaluation?

    Answer: Weight-bearing AP projection of the foot

    Weight-bearing AP projections best reveal Lisfranc (tarsometatarsal) instability by demonstrating diastasis under physiologic load.

  2. For the bilateral frog-leg (modified Cleaves) projection of the hips, the patient's thighs are abducted approximately how many degrees from vertical?

    Answer: 40-45 degrees

    The frog-leg position requires 40–45 degrees of bilateral thigh abduction from vertical to profile the femoral necks.

  3. Bohler's angle (tuber-joint angle) is assessed on which projection of the calcaneus?

    Answer: Lateral projection

    Bohler's angle (normally 20–40 degrees) is measured on the lateral calcaneus projection and is decreased in calcaneal compression fractures.

  4. For the AP projection of the pelvis, the lower limbs are placed in how many degrees of internal rotation?

    Answer: 15 degrees

    Internal rotation of 15 degrees counteracts femoral neck anteversion, placing the femoral necks parallel to the IR for a true AP pelvis.

  5. Which projection of the knee specifically evaluates the posterior tibial plateau for impaction fractures?

    Answer: Posteroanterior axial (Rosenberg) weight-bearing projection

    The Rosenberg weight-bearing PA flexion view at 45 degrees is sensitive for early joint space narrowing and posterior tibial plateau lesions.

  6. For a tangential (Merchant) projection of the patella, the knee is flexed approximately how many degrees and the CR is directed:

    Answer: 45 degrees; 30 degrees caudad from horizontal

    The Merchant method uses 45 degrees of knee flexion with the CR angled 30 degrees caudad from horizontal to project the patellofemoral groove.

  7. When imaging the sesamoids of the great toe using the tangential projection, the foot is dorsiflexed and the CR is directed:

    Answer: Parallel to the plantar surface and tangent to the first MTP joint

    The CR is directed tangentially along the plantar surface of the foot at the level of the first MTP joint to profile the sesamoid bones free of superimposition.