What is a Myotendinous Junction?

The myotendinous junction (MTJ) is the interface between muscle and tendon and where force is transmitted between the two tissues. It is also a common location for strain injuries in sports. Most of these can be prevented by heavy eccentric exercise.

What is Myotendinous unit?

Myotendinous unit, also called muscle-tendon-bone or muscle-tendon-enthesis unit, is a complex structure, responsible for producing skeletal movement.

Where is the Musculotendinous junction located?

The myotendinous junction (MTJ) is a complex specialized region located at the muscle-tendon interface that represents the primary site of force transmission. Despite their different embryologic origins, muscle and tendon morphogenesis occurs in close spatial and temporal association.

What is the proximal Musculotendinous Junction?

The proximal musculotendinous junction of the long head of the biceps femoris (MTJ-BFlh) is most frequently injured,15 as attributed to its long, narrow aponeurosis, which leads to poor dissipation of force from the muscle belly to the tendon at this interface.

What is supraspinatus Myotendinous Junction?

Supraspinatus myotendinous junction injuries are an uncommon type of rotator cuff tear that present with distinctive imaging findings. The pathophysiologic process of these lesions is conditioned by the anatomy and biomechanics of the supraspinatus muscle.

What is Infraspinatus Myotendinous Junction?

Abstract. Purpose: Tears involving the myotendinous junction (MTJ) of the infraspinatus (IS) have been recently described on MRI. These occur centrally in the muscle belly, and are not associated with full thickness tears of the distal infraspinatus tendon.

What is Myotendinous Junction shoulder?

What is infraspinatus Myotendinous Junction?

What type of joint is infraspinatus?

Infraspinatus is the main external rotator of the shoulder joint. It assists in producing shoulder extension. With the arm fixed, it abducts the inferior angle of the scapula.

What nerve innervates the supraspinatus and infraspinatus?

The suprascapular nerve
The suprascapular nerve has a motor and sensory innervation. Its motor innervation is to the supraspinatus and infraspinatus muscles.

What is the main function of infraspinatus?

The infraspinatus muscle’s action on the shoulder is primarily through its function as a rotator cuff muscle providing glenohumeral stability. The rotator cuff applies compression upon the head of the humerus that allows for the stabilization of the humeral head during shoulder abduction.

What movement does the infraspinatus perform?

Action. Infraspinatus is the main external rotator of the shoulder joint. It assists in producing shoulder extension. With the arm fixed, it abducts the inferior angle of the scapula.

What does positive Hawkins Kennedy test indicate?

Interpretation. A positive Hawkins-Kennedy test is indicative of an impingement of all structures that are located between the greater tubercle of the humerus and the coracohumeral ligament. The impinged structures include the supraspinatus muscle, teres minor muscle, and the infraspinatus muscle.