They are better than the stright shovels, but they are not perfect. Only if the pain is affecting your activites. Soft tissue trauma usualy resolves in 2-3 weeks. If it is lasting longer than that, it is worth a conversation. My daughter is 10 and is a gymnast.
Gymnasts are prone to have stress fractures in their back from the repetive activites they do.
She needs to see a children's orthopedist. Dr. Brian Black is an expert that she can see. The more operations that you have the less likely they are to be successful. Before you commit to another operation the planning for the operation must be exquisitely well done. Ask for a second opinion and don't commit to surgery untill the plans agree.