Mechanism: Forceful flexion of distal phalanx results in disruption of extensor apparatus. Patients often present with a flexor deformity.
Pathophysiology: This is classified as a type of zone 1 injury involving the DIP joint.
4 Types: Type 1: closed without fracture
Type 2: Open tendon laceration without fracture
Type 3: Open tendon injury with disruption of
Type 4: Open with fracture of base of distal phalanx
Management: Type 1 can be splinted in extension for 6 weeks (with dorsal aluminum splint). Type 2-3 the tendon and overlying skin should be repaired with a figure of 8 stich or a baseball stitch then splinted in extension for 6-8 weeks. Type 4 likely needs orthopedics for operative intervention.