bunion joint name

The joint affected in a bunion is called the metatarsophalangeal (MTP) joint. This is the joint located at the base of the big toe where the metatarsal bone (the bone of the foot that connects to the toe) meets the phalangeal bone (the bone of the toe). The MTP joint is a hinge joint that allows for up and down movement of the big toe. In a bunion, the MTP joint becomes misaligned, causing the big toe to angle towards the other toes and creating a bony bump on the inside of the foot. This misalignment can lead to pain, inflammation, and difficulty in walking.