hi i had a failed attempt of a lumber puncture in the emergency dept, i was sitting up leaning forwards, it was much more painfull then expected, the dr did re assure me that he had done many lumber punctures,,the dr had quite a few attempts at it , my mum said she saw the dr change needles at least 3 times, whilst dr was attempting it i felt two poping sensations they hurt quite a bit and i ended up crying from the pain and discomfort, i did let the dr know the pain was too much and ended up saying id had enough i couldnt cope with it any more,, my back was really sore for the next few days, and i was ,very stiff in my movements, the failed attempt was 2 wks ago tuesday and is still tender,,, there was a second guided lumber puncture the following morning which was successful..Iv been worried what the popping sensation was, it didnt happen again on the guided lumber puncture, which was a breeze and much less painfull then the failed attempt.. thanx for any info or advice you may be able to give me,, sandy