IE was dismounting the ladder on a D10N. When the IE stepped to the ground, foot slipped causing IE to pull on the hand rail. IE felt a pop in shoulder. On 6.25.18 the IE was seen by an ORTHO and it was determined that IE pulled the biceps tendon off the shoulder. IE was given a work as tolerated release until surgery on 7.19.18 at which point it became an LTA.