Given the task definition and input, reply with output. Given an abstract, generate a keyword (a noun phrase) that best describes the focus or contribution of the paper. Such keywords can be directly from the given abstract or outside it.

Abstract: A complete volar dislocation of the metacarpophalangeal joint of a ring finger occurred in a 31-year-old man and was successfully treated by a closed reduction. We found only six cases of volar metacarpophalangeal joint dislocation reported in the literature all of which needed open reduction.
Adult