Nursing home negligence

I broke my leg in July,9 screws & 1 plate,had to have rehab in a residential facility.That week the nurse was transferring me from the commode to bed. {My leg was in a cast and I was non weight bearing.} I asked her to fix the sheet, she let go of me and I fell backwards onto steel wheel chair legs & the garbage pail. Had to be taken by ambulance to the Dr.that did my surgery.Had a hematoma the size of a grapefruit, contusions, & bad bruises. It's still there tho smaller and still hurts to the touch. Do I have a case?