Choose the incorrect sentence about the ankle block:
A) Deep fibular nerve is next to the anterior tibial artery
B) Superficial fibular nerve innervate the dorsal aspect of the foot
C) You don’t need to block the sural nerve for hallux valgus surgery
D) The tibial nerve is always posterior to the posterior tibial artery
The sural nerve is only responsible for the innervation of the lateral aspect of the foot, not involved in the area covered by the hallux valgus surgery.
Indeed, 4 of the 5 peripheral nerves that innervate the foot are often closer to blood vessels and provide useful sonographic landmarks for the administration of local anaesthetic:
- Deep peroneal nerve is lateral to the anterior tibial artery
- Tibial nerve is posterior to the posterior tibial artery
- Saphenous nerve is adjacent to the internal saphenous vein
- Sural nerve is posterior to the external saphenous vein
However, there are anatomical variations and ultrasound become vital in diagnosis and correct performance of peripheral nerve blocks.