Do breast lifts repair Cooper Ligaments to correct sagging?

Thank you for your excellent and unique questions and nice job on the research!  Breast lifts do not repair Cooper ligaments, they are procedures designed to remove excess skin, tighten the remaining breast, and elevate the nipple.  Coopers ligaments stretch with time, gravity, and size changes to the breast tissue during pregnancies, weight fluctuations and menstrual cycles.  Theoretically, if the nipple position was acceptable, and the sagging skin was the only issue, then a maneuver to tighten the skin without surgery could replace a lift.  

Thanks for your questions.The essential parts of a breast lift are nipple repositioning, breast envelope tightening and glandular repositioning. There are several different procedures and they each use these different elements slightly differently.Thus Coopers ligaments are not an essential part of a breast lift. in addition one cannot see them.

During a breast lift, the skin envelope holding the breast tissue is tightened, and the breast tissue itself is repositioned and reshaped.  Cooper Ligaments are not 'repaired' as that is impossible.  Same was as stretched skin is not repaired, but tightening of stretched skin is done by trimming the excess

Breast lift (also called a Mastopexy) involves a variety of techniques depending on the surgeon and the patient's needs.  Barbed sutures have been tried to replace stretched-out Cooper's ligaments, but tissues will pull through these sutures and thus attempts at repairing Cooper's Ligaments are not generally used.An operation that only  repositions the areola and tightens the skin will look good initially, but will result in 'bottoming-out' or pseudoptosis, in which the areola position is fine but the volume of the breast sags below the areola.  Several techniques exist to control the shape and position of the parenchyma (gland and fibrofatty tissue of the breast), and these are most effective at restoring an ideal and lasting shape to the breast.

A mastopexy does not repair Cooper's Ligaments.  Cooper's ligaments stretch over time like most soft tissues in the body.  Weight gain/loss, breast engorgement with pregnancy, and gravity all affect that process.  Unfortunately there is no way to lift the breast nonsurgically.  There are several mastopexy techniques but they all involve removal of excess skin and therefore result in scars.