There is some question about what caused this?
There is some question about the cause of her initial collapse. There is no question about the cause of her lack of improvement.
Yes, Terri's family was kept in the dark (until ~ 2001) about a bone scan that was done in 1991. Apparently, according to the scan details, Terri "complained" during her physical therapy sessions. She was sent for a scan and it was discovered that she had broken bones all over her body: ribs, pelvic area, and femur among others. It makes one wonder why Terri really collapsed that Feb. night in 1990. Here's the link:
http://www.ginzell.net/terri_schiavo_bone_scan.html