A miner was working in L1-876 hanging trough and was unable to reach the wire from the ground and chose to use a 5 gallon bucket to stand on. It became unstable causing miner to fall injuring right knee. Self-treated for 3 days, was sent to Fairbanks for an evaluation, was released to duties as assigned, while on R&R saw personal physician placing miner on No Work as of 07Aug19.