Keifhaber-Stern classification of volar plate avulsion injuries of hand
This classification was proposed originally by Hastings, and later modified by Keifhaber and Stern in 1998. This classification along with Eaton classification is the most widely accepted classification at time of writing (August 2016) for management og volar plate avulsion injuries1.
Three types according to this classification are-
StableAvulsion fracture involving <30% articular base of the middle phalanx
TenuousAvulsion fracture involving 30%-50% articular base of the middle phalanx; reduces with <30° of flexion
UnstableAvulsion fracture involving <50% articular base of the middle phalanx but requires >30° flexion to maintain reduction