Scapulohumeral Rhythm

The shoulder is the most mobile joint in the body. It is a combination of several articulations: the glenohumeral, scapulothoracic, sternoclavicular, and acromioclavicular joints. Each of these contributes to shoulder and arm movement via a process known as joint “coupling.” For example, when you raise the arms over the head in Urdhva Hastasana, the clavicle pivots on the sternum (breastbone), the scapula rotates on the chest wall, and the head of the humerus moves within the shoulder joint. All of these work together simultaneously in what is known as scapulohumeral rhythm. In general, 60 degrees of this action comes from movement of the shoulder blade on the chest wall (scapulothoracic motion) and 120 degrees from the ball and socket of the shoulder (glenohumeral motion). During this process, the clavicle rotates on its long axis approximately 25 degrees and the humerus externally rotates about 45 degrees. Scapulohumeral rhythm is illustrated in the video below, with a breakdown of scapulo-thoracic and gleno-humeral contributions to the entire movement. www.dailybandha...

[@nancy.callan]

This is fabulous! Perfectly illustrates the concept. Thanks.

[@MikeCola]

The normal rhythm between the humerus and scapular is 2 to 1 degrees. For every 2 degrees the arm moves up, the shoulder blade should rotate 1 degree. The ratio is not always 2 to 1 during the whole movement. During the 1st 30 degrees or so of humeral abduction, the scapular does not move much, but catches up, as the humerus keeps abducting to average a 2 to 1 ratio.
Isometric exercises are a great way to keep the shoulder joint healthy and help correct Scapulohumeral Rhythm.

[@ebrahimsayed9242]

what about external rotation exercise?

[@Zetsuke4]

The best video on glenohumeral joint I've seen

[@nickiemcnichols5397]

This is valuable information for all violinists!

[@Life_aid]

wow... amazing!!!!!!!!! perfect!!

[@Alisonwest]

The collar bone (clavicle) is regularly left out the discussion. It contributes about half of the non-humeral movement.

[@johnmastroligulano7401]

This is awesome thank you.

[@physio_learning_point]

Good 👍

[@emilydice9440]

makes sense why there's a decrease in forward flexion of the shoulder if you have a paralyzed Trapezius

[@xingwen2501]

so good the video is, thank you

[@rl7651]

In observing this movement it looks like the humerus leads and the scapula follows, so perhaps this should be called humeroscapular rhythm. An excellent demonstration regardless of which way you refer to it. Might I recommend also doing an animation with the movement of the arms across the chest to show the rotation from that angle?

[@mariatrujillo6857]

according to an article about the shoulder to avoid subacromial impingement, the humerus must make an external rotation, I ask in postures like urdhva hastasana, virabhadrasana I, utkatasana the rotation of the arms is internal, but according to this it should be external.? thank you.

[@lostkid6837]

Thank you, but is there a kinematics pro here to confirm the accuracy of this ? Would really like to know !

[@stevenb5778]

Question: Going with the 2:1 ratio; how is that displayed in 0:31? So I assume the total is 150 degrees of abduction. But according to the rule 2/3rds of that is humeral and the other third is scapular??

[@ohman4050]

before lifting the scapular, the humeral is lifted 30° so u have to add to 80 + 30 = 110

[@ams9449]

during the elevation all the sternum goes along in this animation, definitely something wrong here! : )