The shoulder joint includes 3 bones: the clavicle (collarbone), the scapula (shoulder blade), and the humerus (upper arm bone) with two joints. These joints are the acromioclavicular (AC) joint and the glenohumeral joint which is the traditional "ball-and-socket" that allows complete range of motion....

"Frozen shoulder" causes pain and loss of motion in the shoulder joint. Though rather a condition than a well defined disease, it is often associated with Dupuytren's disease. Patients with a frozen shoulder have about an eight times higher risk of developing Morbus Dupuytren, i.e. Dupuytren's contracture (association_frozenshoulder). ...