In House, M.D., what fictional condition caused House’s chronic leg pain?

House’s chronic leg pain in House, M.D. resulted from an infarction in his quadriceps muscle.

An infarction occurs when tissue dies because its blood supply is blocked. In House’s backstory, a blood clot cut off circulation to part of the quadriceps, producing permanent muscle damage and severe pain. Doctors initially considered amputation, but House underwent surgery that removed the dead tissue instead.

The injury explains House’s limp and his reliance on a cane. It also contributes to the character’s use of Vicodin, an opioid pain medication, which becomes a major part of his addiction storyline. The show repeatedly connects his physical condition with his emotional isolation and difficult behavior.

This condition is often loosely described as a leg injury, but a fracture or dislocation is not the canonical diagnosis. House’s specific problem is a quadriceps infarction, and the resulting muscle damage is a key part of his biography.