Injection of steroids:
If used correctly, the injection of steroids can actually be a useful tool in the healing process ofrotator cuff injuries.
You are correct that doctors usually inject to the subachromial area however, sometimes, the best approach (depending on the severity of the injury) is an injection targeted to the injured area.
The only good thing about steroids is the temporary pain relief that allows the patient to begin the necessary physical therapy and strengthening exercises.
Certainly, steroids have complications and I would not recommend getting steroid shuts for rotator cuff injuries - unless - the pain and discomfort prevent the patient from undergoing physical therapy
Studies suggest that 3 injections of steroids in the shoulder may have adverse effects.
NO substantial studies that I am aware of suggest otherwise. Please post a link
You can read my previous posts at:
Rotator Cuff strengthening