You need to mention your age. How long back the femur
rod was inserted and for what.
Femur rod can sometimes give rise to pain in the outer side of your hip(upper leg outer side) ; due to bursitis
. There can be thigh pain if suppose there is fracture
that has not healed fully and the rod has become loose.
The problems in the lumbar spine
can cause pain in the buttocks on the back side or going down the back side of the leg.
It is only after examining you and getting various tests/scans done that the exact cause of pain can be determined.
Bye. You can contact me in case you require any further help.