I had left side total hip replaced about 6 years ago. Had trouble at first because leg was almost 1" shorter.  Never had any real pain, just could not raise the leg without me lifting it, especially to get into our pickup.  Recently, when I am standing and putting presure on the left leg, it seems to lock and when I try to move it, I get a shooting pain, not in my hip but right belos and down my leg.  It takes me a while  to get momement back and when I do, the pain is gone.  It lasts about 1-3 minutes.