What provides crucial blood flow to a sural muscle flap?

• A. Anterior tibial artery
• B. Multiple peroneal perforators
• C. Peroneal artery
• D. Posterior tibial artery

Answer: (B)

The key idea is that the sural muscle flap relies on a network of small vessels, specifically perforating branches from the peroneal artery that run through the leg’s septa to the sural region. Because this flap is often designed with a distal pedicle, its survival depends on multiple perforators rather than a single feeding artery. Those perforators provide reliable inflow to the flap, even when the main trunk isn’t directly involved, making the peroneal perforators the crucial source of vascularity. The anterior tibial and posterior tibial arteries don’t supply this region as the primary feeders, and while the peroneal artery is the source, it’s the multiple perforators that ensure robust blood flow and flap viability.