Ж.Билгүүн Гар сарвууны гэмтэл
Zone 1: Over the middle phalynx at insertion site (Mallet's deformity) Zone 3: Over the apeces of the PIP joints (Boutonniere's deformity) Zone 5: Over extensor hoods (MCP) and the dorsum of the hand Zone 7: Over extensor retinaculum. Mallet's: Result from Open injuries (sharp or crushing lacerations), but closed injuries are more common.