there is a difference between the pain from pano and the pain associated with the HD. I have done some reading and pano does not affect the hips but the legs themselves. My puppy is showing signs of HD, it's very obvious where her pain is coming from. Here's a bit of an article I found: There are a few things that can help you figure out whether it's Pano or HD, but they're only guidelines, they can't be considered totally accurate. Only X-rays and proper professional veterinary evaluation will do that.
Firstly, Panosteitis is usually seen in the front legs first and is often very intermittent in nature. Often there will be swelling of the leg joints visible to the naked eye, but the pain is felt more in the middle of the bone (between joints) rather than centered on the joint itself.
Symptoms of Hip Dysplasia are connected with the rear legs and often include weakness or stiffness on rising, a bunny-hopping (or unusual) gait, clicking sound when walking etc. If there is pain or discomfort it will usually be on the rear (hip area) and the dog may resist having hips or rear legs manipulated.