RAD 121LOWER EXTREMITY TEST QUESTIONS WITH
VERIFIED ANSWERS
The pelvis consists of 4 bones -Identify the correct 4 below. - Answers - 2 Innominate
Bones, 1 Coccyx, and 1 Sacrum
How much flexion of the knee is recommended for the lateral projection of the patella? -
Answers - 5 to 10 degrees
Where is the CR placed for an AP projection of the pelvis? - Answers - Midway between
the ASIS and the symphysis pubis
A radiograph of an AP projection of the pelvis demonstrates that the left obturator
foramen is narrowed and the right one is open. The left ischial spine is demonstrated
without pelvic brim superimposition.
What is the specific positioning error present on the radiograph? - Answers - Patients
pelvis is rotated to the left
Which imaginary plane should be placed parallel to the IR for an AP projection of the
knee? - Answers - Interepicondylar
How many articular facets make up the subtalar joint? - Answers - 3
Which one of the following structures is considered to be the most posterior? - Answers
- Ischial spines
Which of the following bones participates(s) in the formation of the obturator foramen?
1. Ilium
2. Ischium
3. Pubis - Answers - 2 and 3 only
What structures serve as a shock absorber within the knee joint? - Answers - Menisci
True or false If a patient has an excessive external rotation of one foot, a fractured hip
on that side may be indicated. - Answers - true
A radiograph of an AP knee reveals that the joint spaces are not equally open and the
proximal fibula is superimposed over the tibia. Which specific positioning error lead to
this radiographic outcome? - Answers - Lateral rotation of lower limb
VERIFIED ANSWERS
The pelvis consists of 4 bones -Identify the correct 4 below. - Answers - 2 Innominate
Bones, 1 Coccyx, and 1 Sacrum
How much flexion of the knee is recommended for the lateral projection of the patella? -
Answers - 5 to 10 degrees
Where is the CR placed for an AP projection of the pelvis? - Answers - Midway between
the ASIS and the symphysis pubis
A radiograph of an AP projection of the pelvis demonstrates that the left obturator
foramen is narrowed and the right one is open. The left ischial spine is demonstrated
without pelvic brim superimposition.
What is the specific positioning error present on the radiograph? - Answers - Patients
pelvis is rotated to the left
Which imaginary plane should be placed parallel to the IR for an AP projection of the
knee? - Answers - Interepicondylar
How many articular facets make up the subtalar joint? - Answers - 3
Which one of the following structures is considered to be the most posterior? - Answers
- Ischial spines
Which of the following bones participates(s) in the formation of the obturator foramen?
1. Ilium
2. Ischium
3. Pubis - Answers - 2 and 3 only
What structures serve as a shock absorber within the knee joint? - Answers - Menisci
True or false If a patient has an excessive external rotation of one foot, a fractured hip
on that side may be indicated. - Answers - true
A radiograph of an AP knee reveals that the joint spaces are not equally open and the
proximal fibula is superimposed over the tibia. Which specific positioning error lead to
this radiographic outcome? - Answers - Lateral rotation of lower limb
