4 Questions
What is the implication of the migrating axis of rotation in most joints?
It alters moment arm length of flexor and extensor muscles
Why do axes move posteriorly with flexion in the knee?
To compensate for loss of mechanical advantage of patella
What may cause skin abrasion in devices like goniometer or hinged knee orthosis?
Unmatching fixed axis of rotation
Where should the fixed axis of external devices be aligned in relation to the knee's axis of rotation?
"Average" axis of rotation of knee, which is lateral epicondyle of femur
Test your knowledge on the migration of joint axis of rotation and its implications for muscle moment arms and mechanical advantage. Understand how the axis of rotation migrates with flexion and the possible mismatches with fixed-axis devices.
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