Structural Fate of Nonoperatively Treated High-Grade Partial-Thickness Rotator Cuff Tears: An Extended Investigation through Subsequent MRI Assessment

hPTRCTs exhibit a time-dependent pattern of structural progression, characterized by a relatively low risk in the first year, followed by a notable increase thereafter. Patients with intermediate-grade tendinosis or smaller mediolateral tear sizes appear to be at increased risk. Further research into the biological and biomechanical mechanisms underlying tear progression may improve treatment strategies and clinical outcomes.