On 6/11/2018 ee was performing mobile equipment inspection on the cat 262C skidsteer. EE knelt down to check the cab filter when Left knee popped and ee felt a slight pain. EE was seen by a physician who recommended ice and OTC meds for pain. On 9/4/2018 ee noticed pain in the same knee and was seen by a physician who ordered an MRI. Surgery occurred on 10/4/2018.