hi mate im no expert but when i worked in retail a while ago as a manager this sort of accident was usualy put down to negligance but as i said for this sort of accident im no expert.just beawre of what might be said.was you using a ladder stopper or anything like this,as they will probaly ask these sort of questions.sorry to here you are in a bad way.keep in touch and let us no how you are doing.if you fancy a chat you can email me.good luck and i hope you recover quickly.