What caused Dr. House’s permanent leg pain in House, M.D.?

A quadriceps infarction caused Dr. House’s permanent leg pain in House, M.D. The infarction occurred when a blood clot cut off circulation to muscle in his thigh, producing severe tissue damage.

House initially experiences pain in his right leg and eventually has dead muscle removed. The resulting injury leaves him with a limp and chronic pain, which he manages with a cane and the opioid painkiller Vicodin. The backstory helps explain both his physical limitations and his dependence on medication.

The show reveals that House’s former partner, Stacy Warner, made the difficult decision to approve a procedure that saved his life but left him disabled. House resents the outcome even though the alternative would have been fatal.

The injury is not a fracture or ordinary sports trauma. “Quadriceps infarction” refers to loss of blood supply and tissue death in the quadriceps muscle, an unusually specific cause for the character’s lasting disability.