excruciating electric shock like pain the back of the knee

I have excruciating electric shock like pain at the back of my knee..left only...it comes without any warning, so severe that i scream...sometimes it doesn't come for few days then it comes 10 times a day...so bizarre..going to do a mri today..the pain lasts only few seconds..once the pain is gone, there is no ache or pain at the knee at all..no pain when i walk or run..nothing, Ultrsound ruled out any clot..there is no swelling, redness either..if anybody has any answers please let me know...thanks in advance,,,

[GoingToMakeIt]

Just a thought, but pain in the knee could be nerve damage in the spine. Many people with spinal compression have radiating pain to and past the knees.
Try going to a neurologist. They can do test to see where the pain originates.

[Dr. A. Srivastava]

Hi, Thank you for your question. It sounds that you might be having a nerve impingement at your knee that may have raised due to any injury (fracture) or any fibrous tissue. It will be best that you consult a neurologist for an general examination and investigations in order to reach at appropriate diagnosis and treatment. Hope this helps.