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Ultrasound-guided saphenous nerve block

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The block of the saphenous nerve, which is basically the purely sensory end branch of the femoral nerve, is carried out about 10 to 15 cm above the knee joint on the medial thigh. A puncture level which seems suitable for this is the point where the nerve enters the adductor canal. On its distal path from the groin, the nerve runs alongside the femoral artery and femoral vein, lying against the long adductor muscle in the adductor canal and covered by the sartorius muscle. These structures normally make it possible to display its course as far as the puncture level quite successfully.

 

The Technique

After determination of the injection site, puncture is normally carried out on the long axis. A few millilitres of local anaesthetic are absolutely adequate.

 

Sonoanatomic Landmarks

Sartorius muscle

saphenous sono