WAS STANDING ON A CONCRETE & WOODEN PLATFORM APPROX 4' H LEANED ON A 6FT A FRAME LADDER AGAINST A PIECE OF SWITCHGEAR. WAS ATTEMPTING TO CAULK THE UPPER PORTION OF THE SWITCHGEAR UPON PLACING LEFT FOOT ON THE LADDER TO LAND ON SOFT DIRT, LANDED ON THE GROUND WITH BOTH FEET BUT THE TURNING ACTION CAUSED HIS LEFT FEET TO MOVE OUT OF JOINT