In pediatric hand trauma, a ‘Seymour fracture’ refers to a specific open, displaced juxta-epiphyseal fracture of the distal phalanx. Because the nail matrix is invariably torn and incarcerated within the fracture site, it must be aggressively treated with antibiotics, meticulous debridement, and reduction to prevent which severe, long-term complication?

Explanation:
The correct option is b. A Seymour fracture mimics a mallet finger but is distinctly an open fracture through the physeal plate of the distal phalanx. The injury mechanism tears the nail fold, frequently displacing the proximal edge of the nail matrix directly into the fracture gap. If a clinician simply splints the finger or ignores the open nature of the wound, the incarcerated soft tissue prevents fracture healing, and the trapped bacteria cause rapid, devastating osteomyelitis. This destroys the growth plate, leading to permanent physeal arrest, severe deformity, and stunted growth of the fingertip. Prompt nail removal, irrigation, and pinning are strictly required. Reference: Seymour N. Juxta-epiphyseal fracture of the terminal phalanx of the finger. J Bone Joint Surg Br. High-yield orthopaedic mcq.