SEVERE WEATHER- VERY ICY CONDITIONS- HAD COME OUT OF OFFICE AND SLIPPED ON ICE, THOUGHT HE WASO-K, WENT BACK TO WORK AFTER REPORTING IT TO SUPERVISOR, WENT TO DR. ON 3-29-01. ON 4-16-01 HE TOOK OFF WORK BECAUSE PAIN HAD WORSENED. RTW ON 4-17-01, WAS OUT 4-18-01 TO PRESENT.