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Author Topic: Can CT results be wrong?  (Read 851 times)

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Offline Marie McK

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Can CT results be wrong?
« on: July 09, 2011, 01:16:57 AM »
Hi not sure if Im posting in the right section but would appreciate some help please. Apologies to those of you who may have read my story before. My daughter had several subluxations since May last year but none in the past 5 months. She had a CT done in Aug 2010 which said she had Q angles of 41 degrees left knee and 32 degrees right so the dr suggested a TTT. Because she still hasnt stopped growing she cant have that done for a couple of years so she has been to physio and working out at a rehab gym 4 times a week to strengthen muscles and increas balanc and stability. She wears a knee brace and tapes her knee when she dances. When I searched this site for info on Q angles I read lots of posts from people having angles around 25-30 degrees and most talking about how they can easily see their knees turn in or are knock knee or something. Others with lesser degree angles saying "wow with that reading I cant image what your knees look like etc" Well my daughters knees dont look so obviously out of line so if her angles were that high shouldnt it be that visibly obvious. Also her exercise physiologist from the gym says he cant understand it either and that her knees track quite well. I asked previously if q angles can change but didnt receive any replies so maybe I posted in the wrong section. Sorry about the long winded tale but thought someone might have some answers. Thanks

Offline oohheykate

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Re: Can CT results be wrong?
« Reply #1 on: July 09, 2011, 04:33:29 AM »
I can't really answer if the CT scan can be wrong. The tech or Ortho could have measured wrong, then again, anything is possible with legs. I will say that an Ortho should not base he/her opinion for a TTT off Q angles. It's mainly based off of the TG-TT offset which can be obtained from that CT scan. If your daughter's Q angle is that much, she might need to be evaluated for other things such as rotational abnormalities. You should post over in the patello-femoral section, there are very knowledgeable people over there!

Good luck.
-18 years old-
Left knee;
11.07.08- Scope
07.02.09- Lateral Release/Meniscus Repair
11.11.09- diagnosis of Patellar Instability/Patellar Tracking Disorder
12.10.09- Medial Reefing/Lateral Release
01.11- Synvisc
04.14.11- MPFL Reconstruction
06.21.11- LOA & MUA

Offline smillie

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Re: Can CT results be wrong?
« Reply #2 on: July 11, 2011, 03:10:55 AM »
Any time humans are involved there could be human error, so you can't discount that. But as she grows, I'm sure things could continue to change. For a lot of us whose alignment issues began in our early teens or childhood, as we grew, our alignment continued to change and we got worse. I guess it could get better? And maybe her workouts are helping too. At some point if you decide to consider surgery, you would need new CT scans to see where she is at that time any way. Q-angle isn't the thing you're looking for, though. Work with a patella specialist who will look at TT-TG offset and rotational abnormalities.
patella pain began early teens
'94 TTT/LR/VMO adv.
'94 MUA
'10 tried PT again
1/11 scope/hardware removal
4/11 (Finally!) dx medial instability due to LR
5/9/11 LPFL reconstruction scheduled

Offline terrysleeger

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Re: Can CT results be wrong?
« Reply #3 on: July 11, 2011, 03:51:58 PM »
I think you can trus the CT result 99.99%,If possible,you can take the scan one more time...Hope your daugter will be ok....
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