Massage Today
Massage Today dotted line
dotted line

dotted line
Share |
  Forward PDF Version  
Massage Today
September, 2004, Vol. 04, Issue 09

Backhand Injuries

By Ben Benjamin, PhD

Question: When hitting backhand in tennis, which shoulder muscle is primarily responsible for that movement?

Answer: The infraspinatus muscle.

The backhand motion is a forceful lateral rotation of the humerus. The infraspinatus muscle lies in the infraspinatus fossa just below the spine of the scapula. At the lateral edge is the teres minor, which works along with the infraspinatus. The tendon of the infraspinatus is very wide and long.

Muscle-tendon unit and its point of attachment. - Copyright – Stock Photo / Register Mark Infraspinatus tendon tear, showing the muscle-tendon unit and its point of attachment (A), rear view. We use the infraspinatus when we reach into the backseat of the car or when we pull a sweater over our head. If you are right-handed, you are using your infraspinatus as you write across a page. When you lift your arm to blow dry your hair, your infraspinatus is at work.

True or False? Resisted lateral rotation of the humerus primarily tests the supraspinatus muscle-tendon unit.

Resisted lateral rotation demonstration. - Copyright – Stock Photo / Register Mark Resisted lateral rotation. Answer: False. Lateral rotation of the humerus is the primary test for the infraspinatus muscle-tendon unit. When the infraspinatus is injured, the tendon is most commonly the structure at fault. Injury to the tendon can occur in the body of the tendon, but it is more often strained at the tenoperiosteal junction where the tendon attaches to the bone.


Click here for more information about Ben Benjamin, PhD.

 

Join the conversation
Comments are encouraged, but you must follow our User Agreement
Keep it civil and stay on topic. No profanity, vulgar, racist or hateful comments or personal attacks. Anyone who chooses to exercise poor judgement will be blocked. By posting your comment, you agree to allow MPA Media the right to republish your name and comment in additional MPA Media publications without any notification or payment.
comments powered by Disqus
dotted line