<unk>  is a deformed position of the finger, in which the joint closest to the fingertip is permanently bent toward the palm while the nearest joint to the palm is bent away from it (DIP flexion with PIP hyperextension). It is commonly caused by injury, hypermobility or inflammatory conditions like rheumatoid arthritis or sometimes familial (congenital, like Ehlers–Danlos syndrome).
Swan neck deformity
Habit-tic deformity
Planovalgus deformity
Gibbus deformity
Nail disease
Condylar hypoplasia
Barrel chest
Ape hand deformity