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A joint mouse is a loose piece of bone or cartilage. It can occur due to a cartilage defect, but is also often caused by a bone fracture or serious accident to the joint, which causes a loose piece of bone to enter the joint.

With a Haglund's exostosis, you have symptoms at the level of the attachment of the Achilles tendon. Pressure on the bone can cause this bone to thicken, creating a protrusion (exostosis).

A hallux rigidus is a painful osteoarthritis in the big toe. Wear and tear of the cartilage causes a narrowing of the joint (= osteoarthritis). This results in a painful restriction of movement.

Hallux valgus is a condition in which the big toe (hallux) stands inward (valgus). This occurs in part because ligaments are too flexible, mostly in women. The condition can be congenital (familial) or arises from frequently wearing narrow shoes. Hallux valgus is also more common in people who have flat feet.

A hammertoe or claw toe is a bent position of the toe, often the second or third toe, which eventually creates pressure and friction against the footwear.

The various joints of the hand and wrist are responsible for fine motor skills and grasping and manipulating objects. An injury to the hand or wrist can result from overuse or an accident.