Hmmm. This is a tricky one because of your particular situation: osteopenia, slow protocol, etc. The question is, are your sure it's pain actually in the joint? There are a lot of muscles right around there, and when you start working them, and/or overwork them, it gets very sore. My gardening adventures over the past week and a half half left me with sore, tight, lumpy muscles right at the hip (much massaging by my pt helped). Really, just touching the muscle could hurt. Since you've just switched to the cane you might just be working muscles in a different way and that's what's causing your soreness. While I haven't experienced a femoral neck fracture, and hope never to do so (cross my fingers and knock on wood), I have broken several others bones (toe, in the foot, rib, wrist, in the arm at the elbow - yes I am truly a klutz) and a break - especially fresh - is not just a little sore. Initially they hurt like a MF, and there's a constant dull deep ache that doesn't go away. My suspicion - and anyone who's had one feel free to chime in if I'm off here - is that you would feel the soreness/ache while resting, standing would be painful, and walking would be excruciating, if not impossible. I could be wrong, but what you're describing doesn't sound like a fracture. For a sanity check you might want to email/call your contact at your surgeon's office and describe your symptoms. If they're not worried, then you don't need to be.
Pain is so subjective it's hard to say what's normal. If I recall you're about a couple of months out. At that point (and I wasn't on any type of slow protocol) I still experienced soreness. The soreness was nothing like the arthritis pain, though, so it didn't bother me too much. The soreness dissipated over time. Also, an ill considered move could really smart. Every so often I would do something and hurt in such a way that I wondered if I had actually hurt myself or my implant. I was getting around quite well, but I didn't always feel entirely stable.