ARRT Extremities Practice Questions and Answers

ARRT Extremities Practice Questions and Answers When performing the lateral humerus with the mediolateral projection, which of the following does not apply? 1. position patient with back toward IR 2. oblique the patient 20 to 30 degree, to bring the humerus in contact with IR 3. center the CR midpoint of humerus 4. flex elbow to position epicondyles perpendicular to IR. ✅position the patient with back toward the IR. (they will be facing the IR and obliqued 20 to 30 degrees from PA) Proper positioning for the lateral calcaneus will result in: 1) Open joint space between calcaneus and cuboid 2) Superimposed talar domes 3) Lateral malleolus free of superimposition ✅1 and 2 only (it will result in open joint spaces between the calcaneus and cuboid, the talus and calcaneus, and the talus and the navicular. the lateral malleolus will partially superimpose the distal tibia and talus.) The greater tubercle should be visualized in profile in which of the following? 1. AP shoulder, external rotation 2. AP shoulder, internal rotation 3. AP elbow 4. lateral elbow ✅AP shoulder, external rotation The lesser tubercle should be visualized with what projection of the shoulder? ✅AP shoulder, internal view (this places the humerus in a true lateral position.) How can OID be reduced for a PA projection of the wrist? ✅flex the metacarpophalangeal joints How is a hand positioned for a PA projection of the wrist? ✅hand is pronated and the fingers extended, but you need to reduce the OID by flexing the MCP joints What is radial deviation? ✅it is flexing the that brings the thumb closer to the radial bone of the forearm What is ulnar deviation? ✅it is flexing the pinky finger closer to the ulnar bone or outside of the forearm. Why would you not use the radial deviation position for looking at the scaphoid? ✅it foreshortens it radial deviation is better for medial carpals Which of the following articulate(s) with the bases of the metatarsals? 1. The heads of the first row of phalanges 2. The cuboid 3. The cuneiforms ✅2 and 3 only How many bones is the foot composed of? ✅26 Which of the following conditions is limited specifically to the tibial tuberosity? ✅Osgood -Schlatter disease (most common in adolescent boys, involving osteochondritis of the tibial tuberosity epiphysis. the larger patellar tendon actually will pull the tibial tuberosity away from the tibia. ) Each of the digits 2 through 5 of the hand contain how many interphalangeal joints? ✅2 Which of the following is (are) valid criteria for a lateral projection of the forearm? 1.The radius and ulna should be superimposed proximally and distally. 2.The coronoid process and radial head should be superimposed. 3.The radial tuberosity should face anteriorly. ✅2 and 3 only (the radius and ulna are only displaced distally. Proximally, the coronoid process and radial head are superimposed. ) Angulation of the central ray may be required 1.to avoid superimposition of overlying structures. 2.to avoid foreshortening or self -superimposition. 3.to project through certain articulations. ✅1,2, and 3 Which of the following projections of the ankle would best demonstrate the mortise? ✅medial oblique 15 to 20 degrees (the mortise is the articulation between talus, tibia, and fibula) In the 45 -degree medial oblique projection of the ankle, 1. the talotibial joint is visualized 2. tibiofibular joint is visualized 3. foot is dorsiflexed nearly 90° ✅2 and 3 only Which of the following projections will best demonstrate acromioclavicular separation? 1. AP recumbent, affected shoulder 2. AP recumbent, both shoulders 3. AP erect, affected shoulder 4. AP erect, both shoulders ✅both erect, both shoulders For an AP projection of the knee on a patient whose measurement from ASIS to tabletop is 21 cm, which CR direction will best demonstrate the knee joint? ✅0 degrees or perpendicular (perpendicular if it is between 19 and 24) Where should the CR be directed of the knee. ✅1/2 below the patellar apex, or knee joint For an AP projection of the knee on a patient whose measurement from ASIS to tabletop is up to 19cm, which CR direction will best demonstrate the knee joint? ✅3 to 5 degrees caudal For an AP projection of the knee on a patient whose measurement from ASIS to tabletop is greater than 24 cm, which CR direction will best demonstrate the knee joint? ✅3 to 5 degrees cephalic All of the following statements regarding the inferosuperior axial (non trauma, lawrence method) projection of the shoulder are true except: 1. the coracoid process and lesser tubercle are seen in profile 2. the arm is abducted about 90 degrees from the body 3. the arm should be in internal rotation 4. the CR is directed medially 25 to 30 degrees through the axilla ✅the arm should be in internal rotation (the arm is in external rotation. Which of the following terms can be used interchangeably to refer to a part moving away from midline, as well as spreading of the fingers and toes apart? ✅abduction Which of the following terms can be used interchangeably to refer to a part moving toward the midline? ✅adduction A modified axiolateral inferosuperior projection of the femoral neck is particularly useful 1.when the "cross -table" axiolateral is contraindicated. 2.for patients with bilateral hip fractures. 3.for patients with limited movement of the unaffected leg. ✅1,2, and 3