I just have little experience with orthopedic patients as I worked in such a hospital for only three years. Nevertheless all of them except patients with accidents or tumors had the trait P, together with N or A: NP, NPA and PA.
Patients who had to undergo vessel or heart surgery where quite different, in my memory I could not find a pattern, maybe I was not interested enough or I had been too busy mastering challenges.
I also worked in the blood bank -at this time our hospital had at least 4000 beds for all kinds of diseases except pediatrics- I tried to make connections between them and the AB0 system -hello Donna ;) - did not find anything :( -
Maybe Dr. Benis founder of the NPA theory can give me an answer to the experience I think I had made or examples from other members of the board?