MA I: Elbow and Forearm

Question 1

MA I: Elbow and Forearm

what is the normal cubitus valgus angle?

Answer 1

15 degrees

Question 2

MA I: Elbow and Forearm

functional ROM arch of the elbow and forearm joints

Answer 2

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

Question 3

MA I: Elbow and Forearm

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

Answer 3

interosseus membrane

Question 4

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

Answer 4

slackens

Question 5

MA I: Elbow and Forearm

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

Answer 5

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

Question 6

MA I: Elbow and Forearm

Which person can lift more weight and why?

Answer 6

• 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.