MA I: Elbow and Forearm Flashcards
MA I: Elbow and Forearm
what is the normal cubitus valgus angle?
15 degrees
MA I: Elbow and Forearm
functional ROM arch of the elbow and forearm joints
-
between 30 and 130 deg of flexion
- normal is 5 - 0 - 145 deg
-
50 deg of supination/pronation
- Normal is 85/75 deg
MA I: Elbow and Forearm
compression force through the hand is transmitted primarily through the __________ to the ulna
interosseus membrane
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
slackens
MA I: Elbow and Forearm
kinematics of the distal radio-ulnar joint during supination/pronation
radius rolls and slides in similar directions on the head of the ulna
MA I: Elbow and Forearm
Which person can lift more weight and why?
- 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.