Adhesive capsulitis (AC) and frozen shoulder (FS) are two common conditions that affect the shoulder joint. While they share many similarities, there are some key differences between the two.
Adhesive capsulitis is caused by a tightening of the shoulder capsule, which is the connective tissue surrounding the joint. It can be brought on by injury, surgery, or even prolonged immobilization of the joint. The main symptom of AC is a decrease in shoulder range of motion, usually with pain and stiffness. Over time, the shoulder may become completely frozen in place.
Frozen shoulder, on the other hand, is caused by inflammation and thickening of the shoulder capsule. It is typically brought on by reduced activity, such as inactivity after a shoulder injury or surgery. The main symptom of FS is a decrease in shoulder range of motion, usually with pain and stiffness. Unlike AC, the shoulder may not become completely frozen in place, but can still be quite limited.
The primary way to differentiate adhesive capsulitis from frozen shoulder is through physical examination. With AC, the shoulder joint will usually be completely frozen in place, and the range of motion will be severely limited. With FS, the range of motion will still be limited, but not as severely. Additionally, the shoulder may still be able to move, albeit with pain and stiffness.
Other diagnostic tests, such as X-rays and MRI scans, may also be used to differentiate between the two conditions. X-rays can show any signs of arthritis, or other conditions that could be causing shoulder pain and stiffness. MRI scans can detect any signs of inflammation or thickening of the capsule that may be causing FS.
In conclusion, adhesive capsulitis and frozen shoulder are two common conditions that affect the shoulder joint. While they share many similarities, there are some key differences between the two. The primary way to differentiate between the two is through physical examination. Other diagnostic tests, such as X-rays and MRI scans, may also be used to confirm the diagnosis.