Final answer:
A pilon fracture involves the distal end of the tibia and disrupts the ankle joint surface, often requiring surgery with metal plates and screws for proper healing.
Step-by-step explanation:
The feature common to all pilon fractures is that they involve the distal end of the tibia and disrupt the ankle joint surface. Specifically, a pilon fracture is a fracture that occurs at the distal end of the tibia and typically extends into the weight-bearing surface of the ankle joint. Due to the nature of these fractures, surgery is often required to restore the joint surface and stabilize the bones to allow for proper healing. This may include the use of metal plates and screws for stabilization. Given the complexity of these fractures and their involvement with the joint surface, there is a risk of developing arthritis and affecting joint function without appropriate treatment.