What causes a frozen shoulder?
Frozen shoulder is the result of inflammation, scarring, thickening, and shrinkage of the capsule that surrounds the normal shoulder joint. Any injury to the shoulder can lead to a frozen shoulder, including tendinitis, bursitis, and rotator cuff injury (rotator cuff syndrome). Frozen shoulders occur more frequently in patients with risk factors of diabetes, chronic inflammatory arthritis of the shoulder, or after chest or breast surgery. Long-term immobility of the shoulder joint can put people at risk to develop a frozen shoulder.