Is electrical muscle stimulation machine for physical therepy for a previous shoulder dislocation helpful?

Yes.: It can improve muscle and nerve function, and improve circulation to the area. A damaged area of tissue will have altered voltage on the surface of the cells. The status of this voltage can affect healing, especially if it is low. I do not see much downside to using it in conjunction with other therapy.

Estim: Yes an estim machine can be helpful to aid in your physical therapy recovery.