Updated: 10/6/2016

Phases of Throwing

Topic
Review Topic
0
0
Questions
3
0
0
Evidence
6
0
0
Videos
4
https://upload.orthobullets.com/topic/3039/images/1f1.large.jpg
Phases of Throwing


  • There are 5 main phases of throwing
    • wind up (see below)
    • cocking
    • acceleration
    • deceleration
    • follow-through 
  • Biomechanics
    • scapula must work in concert with humerus to maintain glenohumeral stability
    • the entire throwing motion takes approximately 2 seconds
      • with wind up and acceleration phases taking approximately 75% of time (1.5 seconds)
1. Wind Up
  • Description
    • minimal force on the shoulder during first stage
  • Muscle activity
    • rotator cuff muscles are inactive during this phase
2. Cocking
  • Sometimes described as 2 sub-phases
    • early cocking
      • peak muscle activation
        • deltoid
    • late cocking
      • high torque phase with maximal shoulder external rotation
      • peak muscle activation
        • supraspinatus
        • infraspinatus
        • teres minor
  • Associated pathology
    • internal Impingement 
    • GIRD (glenohumeral internal rotation defect) 
3. Acceleration
  • Description
    • rotates ball to release point
  • Muscle activity
    • early muscle activation
      • triceps
    • late muscle activation 
      • pectoralis major
      • latissimus dorsi
      • serratus anterior  
4. Deceleration
  • Description
    • center of gravity moves over plantar foot
  • Muscle activity
    • eccentric contraction of all muscles is required to slow down arm motion
    • highest torque phase
  • Associated pathology
    • recognized as the most harmful phase of throwing
    • associated injuries
      • superior labrum (SLAP lesion) 
      • biceps tendon injury 
      • brachialis injury
      • teres minor injury
5. Follow-through
  • Description
    • phase where body rebalances and stops forward motion
  • Muscle activity
    • muscle activity returns to resting levels
 

Please rate topic.

Average 4.2 of 30 Ratings

Thank you for rating! Please vote below and help us build the most advanced adaptive learning platform in medicine

The complexity of this topic is appropriate for?
How important is this topic for board examinations?
How important is this topic for clinical practice?
Questions (3)
Question locked
Sorry, this question is for
PEAK Premium Subscribers only
Upgrade to PEAK
Question locked
Sorry, this question is for
PEAK Premium Subscribers only
Upgrade to PEAK

(OBQ11.107) Which of the following is true of the scapula during an overhead throwing motion? Review Topic

QID: 3530
1

It maximally retracts on ball release

2%

(58/2849)

2

It protracts during late cocking to prevent impingment on the rotator cuff

17%

(472/2849)

3

It must rotate in the cocking and acceleration phases to prevent impingement on the rotator cuff

75%

(2126/2849)

4

It must remain fixed during the throwing motion to impart maximal energy

4%

(121/2849)

5

It has no effect on concavity-compression

1%

(40/2849)

ML 2

Select Answer to see Preferred Response

PREFERRED RESPONSE 3
ARTICLES (7)
VIDEOS (4)
Topic COMMENTS (1)
Private Note