THE EE WAS OPERATING A CRANE MOVING SOME LINERS. THE LINERS STARTED SHIFTING, AND THE EE WAS ATTEMPTING TO STABILIZED THE LOAD USING A TAG LINE. THE LINERS FELL, AND THE EE'S LEFT ARM WAS PINN ED BETWEEN A LINER AND A HANDRAIL. THE EE WAS TRANSFERRED TO THE ER FOR TREATMENT & EVALUATION. HE WAS DIAGNOSED W/FRACTURED ULNA OF LEFT ARM. RELEASED TO LIGHT DUTY, USING RIGHT ARM ONLY.