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AC Arthritis

General AC stands for acromioclavicular. The AC joint is where the bone at the top of the shoulder (acromion) meets the collarbone (clavicle). Anatomy The AC joint is stabilized by the acromioclavicular (AC) ligaments, the coracoclavicular (CC) ligaments, joint...

AC Separation

General “Shoulder separation” is term commonly used for an injury to the AC (acromioclavicular) joint that makes it unstable. The AC joint is where the bone at the top of the shoulder (acromion) meets the collarbone (clavicle). Injuries to the AC joint are quite...

Frozen Shoulder

General Information “Frozen shoulder,” also known as “adhesive capsulitis” is a slowly progressing, painful loss of shoulder motion due to inflammation and thickening of the capsule that surrounds the joint Occurs in 2% of the general population Most commonly occurs...

Multidirectional Instability

General The shoulder is the body’s most mobile joint. The same anatomy that gives the shoulder its amazing mobility and range of motion also makes it vulnerable to dislocating or becoming unstable, a condition called instability. Instability is a catch-all term that...

Proximal Humerus Fracture

General The terms “fracture” and “broken” mean the same thing and can be used interchangeably. Account for 4-6% of all fractures Most common among elderly women Result from low-energy falls among older patients with poor bone quality. Result from very high-energy...