A boutonniere deformity or buttonhole deformity is an injury to a tendon in one of the fingers, resulting in a deformed shape. This usually occurs after an impact to a bent finger. See below for more on the causes, symptoms and treatments of Boutonniere deformity.
Sudden onset finger pain
A sprained finger occurs when the finger is bent in some way causing damage to the ligaments which connect bones together. It is a common injury in ball games such as American football, basketball, cricket, and handball. A sprain can be helped by rest, ice and compression and also a taping method, details of which can be seen below