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Questions and Answers
What is the implication of the migrating axis of rotation in most joints?
What is the implication of the migrating axis of rotation in most joints?
- It leads to a fixed axis of rotation in the knee
- It alters moment arm length of flexor and extensor muscles (correct)
- It causes skin abrasion in external devices
- It results in loss of mechanical advantage of patella
Why do axes move posteriorly with flexion in the knee?
Why do axes move posteriorly with flexion in the knee?
- To prevent skin abrasion in external devices
- To compensate for loss of mechanical advantage of patella (correct)
- To align with the lateral epicondyle of femur
- To maintain a fixed axis of rotation
What may cause skin abrasion in devices like goniometer or hinged knee orthosis?
What may cause skin abrasion in devices like goniometer or hinged knee orthosis?
- Alignment with the lateral epicondyle of femur
- Loss of mechanical advantage of patella
- Unmatching fixed axis of rotation (correct)
- Migrating axis of rotation
Where should the fixed axis of external devices be aligned in relation to the knee's axis of rotation?
Where should the fixed axis of external devices be aligned in relation to the knee's axis of rotation?
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