The saphenous nerve is the nerve branching off from the larger femoral nerve, and which transmits sensation on the inner aspect of the leg.

Distribution of sensation relating to the saphenous nerve.
Infrapatellar branch of saphenous nerve
An important branch of the saphenous nerve relating to the knee is the infrapatellar branch which transmits sensation at the inner aspect and lower pole of the patella, and which is quite often damaged during surgery.
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FORUM DISCUSSIONS
Meniscal repair - saphenous nerve
CLINICAL PUBLICATIONS
Entrapment of the saphenous nerve at the adductor canal affecting the infrapatellar branch – a report on two cases. Porr J, Chrobak K and Muir B. J Can Chiropr Assoc. 2013 Dec; 57(4): 341–349.