Three stages of shoulder impingement syndrome
- • Stage I usually occurs under 25 years of age and is characterized by tendon hemorrhage and edema.
- • Stage II usually occurs between 25 and 40 years and is characterized by tendinitis and fibrosis of the subacromial bursa.
- • Stage III usually occurs over 40 years of age and is characterized by tears of the rotator cuff and bicipital tendon.
Stages I and II are reversible with appropriate treatment.