Question

elbow flexion occurs around the ____ axis and can be called ____ in orthogonals.

a) sagittal, -θy

b) transverse, +θz

c) coronal, -θx

d) frontal, +θx

Explanation:

To solve this, we recall the axes of motion: Elbow flexion (bending the elbow) occurs around the sagittal axis (also, in orthogonals, the angular displacement for elbow flexion is typically \(-\theta_Y\) as per biomechanical coordinate systems). Let's analyze each option:

• Option a: Sagittal axis is correct for elbow flexion, and \(-\theta_Y\) matches the angular notation for this motion.
• Option b: Transverse axis is not the axis for elbow flexion (transverse axis motions are like rotation of the forearm, not flexion).
• Option c: Coronal (frontal) axis is for motions like abduction/adduction, not flexion.
• Option d: Frontal axis is incorrect for flexion, and the angular notation also doesn't match.

Answer:

a) Sagittal, \(-\theta Y\)