What rare leg injury causes Gregory House's chronic pain in House M.D.?

A quadriceps infarction causes Gregory House's chronic leg pain in House M.D.

In the show's backstory, a blood clot blocks circulation to muscle in House's thigh, causing tissue death in the quadriceps. The damage leaves him with lasting pain and impaired mobility. He eventually uses a cane and relies on prescription pain medication, especially Vicodin, to manage the condition.

The injury is important to the character rather than merely a visual detail. House's pain contributes to his irritability, isolation, and fear of losing control. It also affects how colleagues and patients interpret his behavior, although the show does not treat the injury as a complete explanation for his personality.

Viewers sometimes describe the condition as a simple leg fracture or a knee injury, but those descriptions are inaccurate. An infarction is caused by interrupted blood supply, not by the bone breaking. The series dramatizes the medical history, and real cases of isolated quadriceps infarction are uncommon.