In medicine,<unk> is a symptom of pathology in a joint. It is a complaint by a person when they are unable to fully flex or fully extend a joint. This term is also used to describe the mechanism of lower limb joints held in full extension without much muscular effort when a person is standing. __TOC__
Joint locking 
Joint stiffness
Valgus deformity
Facet joint injection
Habit-tic deformity
Joint stability
Phantom pain
Footwell intrusion