HI, thanks for using healthcare magic
Tennis elbow can cause pain in the elbow and arm, with tenderness in the elbow region.
Because of abnormal movements, there may also be pain in other areas such as the shoulder or wrist but it may be best for her to have imaging of the shoulder, elbow and wrist to rule out other bony causes.
This is an important aspect of assessment and management.
In terms of the
steroid injection, this is very effective for conditions such as tennis elbow because it reduces inflammation of the joint directly. It may take a few hours, up to 24 hours , to take effect. Relief can last for a long period of time.
Only one injection would likely be needed which would reduce any side effects.
The main possible complications are: (1) pain at the site,
(2)with any injection, there is a risk of introducing infection
(3)skin discoloration
(4)increased blood sugar
I hope this helps