INJURED WAS OPERATING GROVE 60 TON CRANE. HE HAD GOTTEN OFF OF THE CRANE TO CONFER WITH THE MECHANICS ABOUT A BOOM REPLACEMENT ON ONE OF THE LOADERS. AFTER CONFERING WITH THE MECHANICS, HE WEN T BACK TO THE CRANE. AS HE STEPPED UP ON THE 1STACCESS STEP HE FELT A POP & PULL IN HIS RIGHT LEG. HE CONTINUED TO WORK & COMPLETED HIS SHIFT. HE SOUGHT MEDICAL ATTENTION THE FOLLOWING DAY.