i am 23 years old. all of this started after i went rafting, my calf started to feel numb and having tingling sensation when touched. at first i thought it was just because of cold wind and cold water but the symptom continue until now, after 1 week. my thigh muscle very weak after rafting, i even fell down few times when walking. now after 1 week, i developed some mild backache. i wonder whether i have lumbar spinal stenosis? as long as i remember, there's no impact to my back or leg when rafting.