In House, M.D., Gregory House uses a cane as a walking aid.
House walks with a limp because of a muscle infarction in his right thigh, a past injury that caused lasting pain and mobility problems. The cane is one of the character’s most recognizable visual features and reinforces the connection between his physical limitations and his medical expertise.
The cane is not simply a prop for appearance. House uses it throughout the series while moving around Princeton-Plainsboro, and it is frequently associated with his distinctive posture and gait. The character’s leg injury is a separate fact from the device he carries: the injury explains the cane, but the answer to this question is the walking aid itself.