Employee ascended the stairs on a Komatsu500 loader. Employee was cleaning the loader. Employee PPE:boots,hi-vis,earplugs,hardhat,goggles,textured nitrile gloves. Task required a different implement. Employee said their goggles fogged when they reached for the handrails to descend,causing them to miss the rails and fall,resulting in broken vertebra,L5 and T12 rupture.