My tennis elbow has flared up again and would like injections. ?

Tennis elbow: The best is to make an appointment with a Pain Specialist or Orthopedic Specialist for this injection

Extensor tendinitis: This is a common problem and does respond to local cortisone injections, but maybe a more lasting approach is to visit a physical therapist who can perform a "Friction Massage". This can be very painful at the time, but conceivably could be a long-term benefit.