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A 23-year-old man is experiencing valgus instability of the elbow after many consecutive seasons of pitching. Which anatomical structure is likely injured and during which phase of the throwing cycle depicted in Figure A will his symptoms be most likely reproduced?
Medial ulnar collateral ligament; B
Lateral ulnar collateral ligament; B
Medial ulnar collateral ligament; C
Lateral ulnar collateral ligament; C
Medial ulnar collateral ligament; E
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Which of the following is true of the scapula during an overhead throwing motion?
It maximally retracts on ball release
It protracts during late cocking to prevent impingment on the rotator cuff
It must rotate in the cocking and acceleration phases to prevent impingement on the rotator cuff
It must remain fixed during the throwing motion to impart maximal energy
It has no effect on concavity-compression