EE was replacing impact rollers on C3 & loaded 2 rollers into manlift (1 on the floor, and 1 lying unsecured on the top rail). EE hit uneven spot in road causing basket to jerk & roller to slip off the rail striking EE's rt foot. EE had X-ray & diagnosed as a contusion. EE returned on 12/15 w/out restriction. On 12/16 diagnosis was changed to a fracture of 5th proximal phalange.