tmf61384,
You do not say what your injury was, but in general, the examination dictates what tests are ordered.
After a thorough examination, if the physician is still unsure of the diagnosis, he/she will order any test that can provide more information.
Again, depending upon what information is needed, things that could be ordered include, but are not limited to:
X-rays
CT Scan
MRI
Electrical studies (NCV - nerve conduction velocity, EMG - electromyography)
Bone scan
Lab tests
Chem 20
CBC with diff
ESR
CRP
Anything else that the physician thinks would provide needed information
Hope you discover what is going on. Good luck.