Mallet finger is a flexion deformity of the distal phalanx, which occurs due to
Mallet finger is a flexion deformity of the distal phalanx due to injury to the extensor digitorum at its inseion to the base of the distal phalanx (the collateral slips).
Avulsion fracture of middle phalanx
Rupture of collateral slips of extensor expansion
Rupture of central slip of extensor expansion
Dislocation of distal interphalangeal joint
Muscles of arm and forearm region & Cubital fossa