MRI Scan on lower back following TkR

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Hi everyone 

Have Google’s this tonight have had very mixed reaction. I had an accident 3 yrs ago when stool I sat on was broken. I left full force on stool leg damaged f1 and facet joint. As part of claim process they have advised MRI on back. I have a different prosthesis in my knee there is about 5 inches top and bottom of knee joint of metal to go into both they cut off and straightened. Some sites saying no to Mrs due too desturbing prothesis with magnets some saying it’s ok. Antony had to have it done please I’m 2 months post op. I don’t want to case further issues. 

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11 Replies

  • Posted

    Hi, I have had both knees replaced with metal and plastic joints.

    One four years ago, and the other two years ago. I also have back problems and have had several MRIs since my knees were replaced. I don’t know if because it’s only two months ago with your op that you are worried, but I would try and speak to the radiology department at the hospital, and they will tell you if it’s ok yet or not.

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  • Posted

    Most (or all) of knee/hip replacements now are made with not magnetic (ferrous) metal and plastic parts. While non-ferrous surgical metal can distort an MRI image, the majority are safe within the strong magnetic field of an MRI machine.  I asked my surgeon for a copy of my knee implant paperwork so I know the make and manufacture.  If you get a copy of your paperwork you could also look up on the manufacture's site as to what materials were used.   

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  • Posted

    Hi, I am a MRI tech and you will be ok to have your MR study.  The prosthesis in your knee is made of either titanium, or stainless steel, or combination, with screws made of the same. Also, there may be a surgical plastic component involved.  You can always, if possible, contact your orthopaedic doc that did the surgery to get a operative report, which would state the prosthesis used.

    The only precautions on my end to scan you would be an other surgeries you might have had, a pacemaker, or brain aneurysm clips.  And, not pertaining to you, we do not like to scan patients within 6-8 week window of surgery.  This is to allow for proper healing  An MR scan may cause some heating and high frequency vibration.

    Question, what do you mean by f1?

    Robert 

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    • Posted

      Thank you very much for your message. Checked with consultant tonight; he said not until 12 weeks post op. Apparently my prothesis is aluminium and titanium.  

      Is it the F1 or S1 and facet joint? 

      Accident happened 3 years ago. I went to optical express for an eye test. Went to sit on stool which was broken unknown to me. I went full force on base of my spine on metal leg sticking out from bottom of stool. claims specialist wants me to have MRI. 

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    • Posted

      That's good to know - thank you! I have MRI scheduled on Saturday and am 4 1/2 months TKR post op....have been trying to contact the MRI dept but no luck so far...so wont bother now I know it will be OK....amazing what you can find on here....much appreciated.....x

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  • Posted

    Never heard of that. I've never had an MRI on knee with TKR as the indication is that its a waste of time as it comes out black but live had me I'd on the same hip and back with no concerns.

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  • Posted

    Hi Trees,

    im just checking that  I’m reading you properly.  You hurt your lower back when you fell and this is what they want an mri taken of right?  Not the knee replacement.  I’d say listen to the mri tech when he says it should be fine to do so but with your surgeons blessings.  You poor, poor thing, falling off that stupid stool.  As if you haven’t got enough going on with your tkr.  I hope this doesn’t set you back too much ( excuse the pun😄.  Good luck with everything

    Sue xx

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  • Posted

    Just to read my post apologies for typing errors. 
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