An AC joint is the acromioclavicular joint, the joint between the acromion of the shoulder blade and clavicle, the collarbone. It is a joint that provides stability and flexibility to the shoulder ...

Medically reviewed by Jennifer Steinhoff, MD Collarbone pain is usually caused by an injury, such as a fracture or joint ...

Test: passive forward elevation of the arm (figure 1). Pay attention to: pain in the shoulder. The pain is relieved by injecting 10 ml of lidocaine beneath the anterior acromion. Background: the ...

1 The association between impingement symptoms and shoulder instability is well established. Excessive humeral head translations, based on capsular laxity and instability,10 15 cause temporal ...