EE WAS DRAGGING A WASHDOWN HOS AROUND CORNERS OF WORK AREA. HOSE CAUGHT ON A PIECE OF GRATING IN THE FLOR AND PULLED HIM BACK. HE SPRAINED HIS LEFT HIP AND LOWER BACK. NO DAMAGE OR IMPAIRMENT TO THE MINING OPERATION OCCURRED. THE INJURY DIDNOT INVOLVE COMPLIANCE, PROFICIENCY, TRAINING, OR ATTITUDE. JOB SKILLS MAY BE A FACTOR. PREVIOUS INJURIES TO HIP MAY BE A FACTOR. SAFETY DEVICES