EE WAS CHANGING A VALVE CHEST INSIDE THE CONFINES OF A SHIELD. WHEN HE CAME OUT AND TRIED TO STAND UP HIS LEFT HIP AND LEG WAS NUMB. CAUSE OF INJURY WAS AWKWARD POSITIONING. COMPLIANCE WITH RU LES/REGS WAS NOT A FACTOR. PERSONAL SAFETY EQUIPMENT NOT A FACTOR. MINER PROFICIENCY COULD BE A FACTOR, MINING EQUIPMENT/SYSTEMS COULD BE A FACTOR(DESIGN)