Are there any tributaries that connect the greater saphenous vein to the smaller saphenous vein posteriorly?

Femoral circulation: the smaller sap genius vein has small tributaries called perforating veins that connect it to the distal femoral vein circulation in the posterior calf area of the leg

Vein of Giacomini.: The most common tributary that connects the great and small saphenous veins posteriorly is called the Vein of Giacomini. There are other unnamed connections also. The Vein of Giacomini is also called the intersaphenous vein.