impingement syndrome classification

Impingement syndrome occurs when shoulder tendons or bursa become compressed between the shoulder's bones during movement. It’s usually classified based on severity and cause: *Stage 1* involves mild inflammation and swelling, often in younger individuals; *Stage 2* includes thicker tendons and ongoing pain; *Stage 3* features overt tendon damage or tears, common in older adults or prolonged cases. This classification helps doctors determine the extent of injury and guides treatment options, from conservative measures like physical therapy to possible surgery in advanced stages.