Joint Axis of Rotation Quiz
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Questions and Answers

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?

  • 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?

  • 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?

    <p>&quot;Average&quot; axis of rotation of knee, which is lateral epicondyle of femur</p> Signup and view all the answers

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