MA I: Elbow and Forearm Flashcards

1
Q

MA I: Elbow and Forearm

what is the normal cubitus valgus angle?

A

15 degrees

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2
Q

MA I: Elbow and Forearm

functional ROM arch of the elbow and forearm joints

A
  • between 30 and 130 deg of flexion
    • normal is 5 - 0 - 145 deg
  • 50 deg of supination/pronation
    • Normal is 85/75 deg
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3
Q

MA I: Elbow and Forearm

compression force through the hand is transmitted primarily through the __________ to the ulna

A

interosseus membrane

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4
Q

MA I: Elbow and Forearm

Holding a load, such as a suitcase, places a distal-directed distracting force predominantly through the radius. This distraction _______ most of the interosseous membrane

A

slackens

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5
Q

MA I: Elbow and Forearm

kinematics of the distal radio-ulnar joint during supination/pronation

A

radius rolls and slides in similar directions on the head of the ulna

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6
Q

MA I: Elbow and Forearm

Which person can lift more weight and why?

A
  • Extending the shoulder reduces the net shortening of the biceps
  • maximal force output of a muscle is greater when its contraction velocity is closer to zero, or isometric.
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