The Yellofin and Ultrafin stirrups are one of the best in lithotomy positioning systems; they enable simultaneous abduction and lithotomy positioning with a squeeze of a single handle. Yellofins and Ultrafins enable safe and easy intraoperative adjustments while providing enhanced surgical access. The fins are designed to reduce the possibility of peroneal nerve injury; they significantly reduce the pressure on the patient’s calf and keep the knees in alignment. Without the fins, the knees have the tendency to gravitate outward and downward causing stretching in the groin and stress on the lower back.