Sudden movement of her legs when in her wheelchair or moving the wheelchair; while standing or a sudden bumping of her foot, especially the left one will cause her to have one of these spasms. When sitting she will lose her balance and fall to the side or sometimes forward. When standing, her legs will give out and she will fall. When washing her and I wash the bottom of her left footing will cause a tremor or shaking spasm. Normally always occurs with her legs. Once a few weeks ago it occurred with her upper body as she was taking off her top. She shook so violently she fell forward and almost fell out of her chair. Fortunately I caught her. Any info you can give me to help understand what this is and if there is help for her would be greatly appreciated.