EE TWISTED LEFT KNEE WHILE SQUATTING TO OBSERVE A SYNTRON IN OPERATION. ON 7-24 HE STEPPED ON A 2-3"" STONE IN SURFACE PLANT AREA AND TWISTED SAME KNEE. WHEN PAIN INCREASED, HE WAS EXAMINED BY AN MD AND FOUND TO HAVE A TORN MEDIAL MENISCUS IN LEFT KNEE. SURGERY WAS NEEDED TO REPAIR AND PERFORMED 8/28. WAS UNABLE TO RETURN TO WORK 8/29. BECAME LOST TIME INJURY.