Abstract
Lacerations across the dorsum of the finger at the level of the proximal interphalangeal joint (PIPJ) may involve the underlying central slip of the extensor mechanism. This injury, if untreated, will lead to the development of a boutonierre deformity, characterised by flexion of the PIPJ and extension of the distal interphalangeal joint (DIPJ). The injury may be overlooked initially as the finger will retain some active extension and the boutonierre deformity subsequently develops over the following days and weeks. In the normal finger, the extensor tendon inserts into the base of the middle phalanx via the central slip and to the base of the distal phalanx via the lateral bands. If the normal finger is fixed in flexion
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