The saphenous nerve is a pesky nerve we tired to ignore for awhile. The reality is that for trauma in the lower extremity, you must always consider the need to add a saphenous block to your popliteal sciatic block. In particular, any wound or abscess on the medial aspect of the lower leg is pure saphenous territory. Additionally, many patients have some amount of saphenous innervation to the ankle joint itself. For a truly complete ankle block, the popliteal sciatic alone won't do.
The great thing is that the saphenous block is technically very straightforward. The anatomy is a bit foreign to most of us but quite simple in the end. This VIDEO will take you through the anatomy and the block technique.