The vastoadductor membrane forms the roof of the adductor (Hunter's) canal, connecting the vastus medialis anteriorly to adductor longus and magnus posteriorly. It is pierced by the saphenous nerve and the descending genicular artery as they exit the canal into the medial thigh and knee.
Forms the roof of Hunter's canal, containing the femoral vessels through the mid-thigh and providing a structural tunnel for the femoral artery and vein.
The vastoadductor membrane is a key anatomical landmark in saphenous nerve block and adductor canal block, which is the preferred regional technique for knee surgery. Endoscopic or ultrasound-guided adductor canal decompression releases this membrane in saphenous nerve entrapment. Haematoma within the canal compresses the saphenous nerve, causing medial knee and leg numbness.
Compression of the femoral vessels or saphenous nerve within Hunter's canal from haematoma, lipoma, or membrane fibrosis, producing medial thigh and knee pain with exertion.
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