WHILE CLIMBING 4 FOOT WOODEN JOB MADE LADDER TO ACCESS WORK PLATFORM AREA, EE STATED THAT HE SLIPPED ON RUNG AND FELL ONTO PLATFORM BELOW. WAS NOT CARRYING TOOLS OR EQUIPMENT, AND NO ICE WAS P RESENT ON LADDER. WAS GIVEN PRESCRIPTIONS FOR PAIN AND ANTI-INFLAMMATORY AND MODIFIED DUTY.