The saphenous nerve is the purely sensory terminal branch of the femoral nerve, providing medial leg and ankle sensation. Saphenous nerve injury during great saphenous vein stripping, varicose vein surgery, or ACL graft harvest produces medial leg numbness along the saphenous vein. Adductor canal block (ultrasound-guided saphenous nerve block in Hunter's canal) provides quadriceps-sparing knee analgesia for ACL reconstruction and knee arthroplasty.
| Origin | Femoral nerve (L3, L4) — the only femoral nerve branch extending distal to the knee |
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The adductor canal block targets the saphenous nerve within Hunter's canal at the mid-thigh level — it provides medial knee analgesia without blocking the motor branches of the femoral nerve (preserving quadriceps function for early rehabilitation). Saphenous nerve entrapment at the subsartorial fascia produces medial knee pain reproduced by palpation at the adductor magnus hiatus.
Ultrasound-guided saphenous nerve block at Hunter's canal providing quadriceps-sparing knee analgesia for ACL surgery and knee arthroplasty.
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