Anatomy and Positioning Principles Questions and Answers Flashcards

Which joint type is found at the knee and allows flexion and extension movements?

Answer: Hinge joint

The knee is primarily a hinge joint (ginglymus), allowing flexion and extension in one primary plane of motion.

The olecranon process is a landmark on which bone?

Answer: Ulna

The olecranon process is the bony prominence at the proximal end of the ulna, forming the point of the elbow.

For an AP projection of the knee, how much is the central ray typically angled cephalad for a patient with average muscle development?

Answer: 3–5 degrees cephalad

A 3–5 degree cephalad angle is used for the AP knee to account for the normal divergence of the x-ray beam and open the joint space.

Which positioning landmark is palpated to locate C7 for cervical spine radiography?

Answer: Vertebra prominens

The vertebra prominens (C7) has the most prominent spinous process in the cervical region and is easily palpated at the base of the neck.

In a lateral hip radiograph using the Lauenstein method, the affected leg is placed in which position?

Answer: Flexed and abducted (frog-leg)

The Lauenstein (frog-leg lateral) method places the hip in flexion and abduction with the knee bent to demonstrate the femoral neck in a lateral projection.

Which image receptor size is most commonly used for a standard PA chest radiograph on an adult patient?

Answer: 35 × 43 cm

A 35 × 43 cm (14 × 17 inch) IR is the standard size for PA chest radiography in adults to include the full lung fields.