Stage 1: Edema and Hemorrhage
Typical age <25
Differential diagnosis Subluxation
A/C arthritis
Clinical course Reversible
Treatment Conservative
Stage 2: Fibrosis and Tendinitis
Typical age 25–40
Differential diagnosis Frozen shoulder
Calcium deposits
Clinical course Recurrent pain with activity
Treatment Consider bursectomy
C/A ligament division
Stage 3: Bone Spurs and Tendon Rupture
Typical age <40
Differential diagnosis Cervical radiculitis
neoplasm
Clinical course Progressive disability
Treatment Anterior acromioplasty
Rotator cuff repair
