A split depression type proximal tibia fracture is a specific type of tibial plateau fracture that occurs when there is a forceful impact to the lateral side of the knee. It commonly happens in high-energy trauma, like car accidents or sports injuries. In this fracture: Split component: A fracture line creates a split in the lateral (outer) aspect of the tibial plateau, separating a fragment from the rest of the bone. Depression component: The articular surface of the tibia is compressed downward, creating a depression or "crater, " which can disrupt the smooth joint surface and affect knee stability and function.