EE WAS DRIVING A GOLF CART TO THE BOTTOM OF THE SHAFT AT THE END OF SHIFT. EE HAD LEG/KNEE HANGING TO THE SIDE OF THE CART. EE WENT THROUGH A CURTAIN AND AN LHD TRACTOR WAS PARKED ON THE OTHER SIDE OF THE CURTAIN. GOLF CART AND EE'S KNEE HIT THE PARKED LHD. HAD A SCRAPE BELOW THE KNEE AND IT SWELLED UP.