Final answer:
The client may sue the nurse for battery.
Step-by-step explanation:
When a nurse inserts an ordered urinary catheter into a client's urethra after the client has refused the procedure and the client suffers an injury, the client may sue the nurse for battery. Battery refers to intentionally touching someone without their consent, resulting in harm or injury. In this case, inserting the catheter without the client's consent and causing injury would be considered a battery.