Hi Maggie,
I initiated a post elsewhere that requested to better understand what is meant by "axial involvement" in PLS -- and whether involvement of axial muscles is a progression of the disease itself, or whether involvement of the axial (spinal and trunk) muscles is somewhat secondary to overuse of the trunk muscles (because the axial muscles are overcompensating for what the legs can no longer do). To make this point, after I had my last lower back surgery, I began to have hip and SI joint pain -- according to my neurosurgeon, both likely caused by overuse (because the hip and SI joint overcompensated for the reduced flexibility in my low back -- which was now immobile because of all the hardware and nuts and bolts installed during 8+ hours of surgery).
I don't know the answer to the above question (axial involvement with PLS), but I see that you may be experiencing this phenomenon.
Me? I've entered a new phase of PLS, in which my lower lumbar, thoracic, neck, and shoulder muscles are in a near-continuous state of spasm. The spasm moves all around (at least THIS makes it "interesting" -- because I never know what to expect day-to-day).
In my case, I had two low back surgeries, the most recent surgery being very significant (hmmm.....as if some back surgeries are NOT significant!?!?!).
For now, the axial involvement -- which is, in fact, different from anything I've experienced prior -- is as bad as the spasticity and pain in my legs. In fact, I've noted that spasm in my shoulders and neck ignites restlessness in my arms and legs (yep, I have this in BOTH my legs and arms --- this is yet another curse).
Mike