On 7/24/09 the intial accident occured, employee was attempting to mount a D-9 Cat Dozer. As he was mounting, he heard a pop in his knee. He was taken to the hospital where he was referred to a specialist for an MRI. He was returned back to work full duty. On 8/7/09, he went for the MRI reading and found a tear in his meniscus and was taken off work.