The Latarjet is now the standard revision surgery procedure for failed stabilization procedures. It accomplishes two things. First, it adds bone to the front of what is usually a deficient socket, after the front edge of the socket fractures during the initial or subsequent dislocations. Second, by tensioning the lower half of the subscapularis muscle, in the front of the shoulder, it creates a "sling effect" where the subscap is tighter and more in control of the shoulder as the arm is brought up into the danger position.
So what's done is to take about 2.5 cm of the coracoid along with the attached coracobrachialis and short biceps tendons and transfer the bone through the middle of the subscap to the front of the glenoid, or shoulder socket. It's usually held in place with two screws. Believe it or not, it can be done arthroscopically, though most surgeons do it open. There are a lot that won't/don't do this procedure, hence the referral to Dr. Provencher. Success requires good position for the bone block and solid healing of bone-to-bone. If those two are achieved, it's about 95% successful.
If not ...