Employee was walking up a staircase @ #1primary. EE had R hand on handrail, while holding tubes of grease in left hand. EE caught foot on a step, lost balance, & struck L elbow. No material on steps, just tripped. Went to clinic, x-ray neg. Dr. placed on 10# weight restriction as precaution. Release to full duty at follow-up appt 1-6-25