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With one of my hip replacement surgeries, I had the same symptom and it was alarming because the hip itself was fine.. It flared up several times over the first 6 months, then stopped as the nerves had time to heal themselves. Nerves heal very slowly - after knee surgery, one of mine in particular took well over a year.

Ice or heat, along with the NSAID medication might help. I also found walking often stimulated my brain to block out the pain signals. If in addition to the pain, the leg becomes hot, red, swollen or tender to touch, it should be carefully checked to be sure a blood colt has not formed, but that is rare.
Sue