While the form may impose certain limits on your rights, signing a statement assuming the risks involved with a procedure does not let the doctor or hospital off the hook if they fail to perform according to acceptable levels of care.
Also, there are situations where the consent is invalid, as for example, if you were not informed of the risks involved with the procedure, were misled about the surgical procedures to be done, or there was incompetence in the performance of the surgery and consequent injury.
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