This document discusses techniques for repairing rotator cuff tears arthroscopically. It begins by describing the classification of partial versus full thickness tears and massive tears involving two or more tendons. For massive contracted immobile tears, interval slides can be performed through the anterior and posterior intervals to regain mobility. Repair techniques depend on the tear pattern, such as side-to-side sutures for U-shaped tears or interval slides for massive immobile tears. Results of arthroscopic repair for massive tears show 84-94% excellent or good results according to several studies. The key is to match the repair technique to the tear morphology and mobility to minimize strain on the repair.