losing height gain from compression?

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Posted on Jan 14, 2014, 2:14 am

#21

Quote from: Medium Drink Of Water on January 13, 2014, 08:53:45 PMHe's not saying you should lengthen 5 if you want 4 because you'll shrink 1cm. He just means turn 5 and then shorten back to 4 if you want 4.

Also, this is an original Professor Ilizarov writing that mentions wires, which (as far as I know) no doctor is using anymore. It might not be relevant now that everyone's switched to pins.

Okey thanks but what does it actually mean shorten back to 4? il need to stay the extra time to be able to turn between 1mm and 2mm a day until i reach 5, and then can i shorten it back myself with the fixator? i thought the thing that shortened me back to 4 was compression from standing up?

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Medium Drink Of Water

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Posted on Jan 14, 2014, 2:49 am

#22

This is something else entirely. It has nothing to do with losing height for any reason other than intentional turns in the other direction. Apparently Prof. Ilizarov believed this would improve the strength of the new bone and/or make it consolidate faster.

Again, you lose length due to pin bending, which happens mostly at the beginning. Once your legs are lengthened they either stay that length or break. Dr. Peng told me I lengthened 7.5cm and that's how much taller I am now.

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Posted on Jan 14, 2014, 10:18 am

#23

Quote from: Medium Drink Of Water on January 14, 2014, 02:49:24 AMThis is something else entirely. It has nothing to do with losing height for any reason other than intentional turns in the other direction. Apparently Prof. Ilizarov believed this would improve the strength of the new bone and/or make it consolidate faster.

Again, you lose length due to pin bending, which happens mostly at the beginning. Once your legs are lengthened they either stay that length or break. Dr. Peng told me I lengthened 7.5cm and that's how much taller I am now.

Yeah sry for asking the same thing so many times, but different answers from different people made me unsure. Just to make it clear when you say "once your legs are lengthened they stay that way or break", you mean at the end of the lengthening phase right before the consolidation phase starts, right? if that is what you meant, am i correct in assuming that part of the bone will already have consolidated at this point, meaning that it would have to break again to shrink?

thank you for your help

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Posted on Jan 14, 2014, 5:24 pm

#24

Rather than get deeper into the confusion, let me just tell you what I know on the subject. Any genuine height loss in the legs is going to be due to pin bending. It has nothing to do with the bone and everything to do with the fixators. Your pins will be done bending by the time you're done lengthening unless you haven't done any weight bearing.

As long as you don't put more stress on them during the consolidation phase than you did during the lengthening phase, you're not going to lose any height. So don't run or jump with the fixators on during consolidation if you hadn't already been doing that during lengthening.

Once your bones are fully consolidated, you don't have to worry about height loss anymore. The new bone is strong just like your old bone.

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Posted on Jan 14, 2014, 10:28 pm

#25

Quote from: Medium Drink Of Water on January 14, 2014, 05:24:36 PMRather than get deeper into the confusion, let me just tell you what I know on the subject. Any genuine height loss in the legs is going to be due to pin bending. It has nothing to do with the bone and everything to do with the fixators. Your pins will be done bending by the time you're done lengthening unless you haven't done any weight bearing.

As long as you don't put more stress on them during the consolidation phase than you did during the lengthening phase, you're not going to lose any height. So don't run or jump with the fixators on during consolidation if you hadn't already been doing that during lengthening.

Once your bones are fully consolidated, you don't have to worry about height loss anymore. The new bone is strong just like your old bone.

okey i get it now, awesome thanks again

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Posted on Jan 15, 2014, 11:51 am

#26

But then again, some people have reported losing some height after the fixators where removed

, like a few mm but still. Is this true and if so what is the cause of it? maybe i would have to lengthen a few mm extra to make up for it in that case.

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Posted on Jan 15, 2014, 4:36 pm

#27

Whether you're measuring height or the bone gap, you're not going to be exact down to the millimeter. The edges of the gaps are fuzzy in x-rays so it's unclear exactly where to measure. Height fluctuates throughout the day and is difficult to measure down to the mm anyway.

I gained probably somewhere between 7.4cm and 7.6cm.

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Posted on Jan 16, 2014, 1:00 pm

#28

Quote from: Medium Drink Of Water on January 15, 2014, 04:36:59 PMWhether you're measuring height or the bone gap, you're not going to be exact down to the millimeter. The edges of the gaps are fuzzy in x-rays so it's unclear exactly where to measure. Height fluctuates throughout the day and is difficult to measure down to the mm anyway.

I gained probably somewhere between 7.4cm and 7.6cm.

yeah thats true, though i guess if the doctors let me, il add a few mm extra over my 4 cm to make sure.

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Posted on Mar 2, 2014, 5:34 pm

#29

I guess what i really wanted to know was kind of not mentioned because i didnt clarify exactly what i meant:

I will ask the doctor as well in our next meeting, but I might as well ask here as well.

When doing External only (no rod inside the bone), once you are far into the consolidation phase, shouldnt the gap have already hardened to a degree, meaning that for any height loss to happen, it would need to "break" or "crack" a bit.

What i mean is that even if you where to remove the fixators slightly earlier than the expected time, if the x-rays shows you have good bone formation, but that it is still not 100% recovered like before, the danger would be that there is a bigger risk of breaking if you where to remove the frames before the predicted time schedule, but the bone at this point wont be able to compress and lose height by simply walking etc? is this correct?

to long didnt read version:

when you are far into the consolidation phase, the reason you still need the frames for a while longer is because they are weaker and more likely to break, but they cannot actually compress from walking at this point? is this correct or is there a risk of compression and height loss as well?

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paco

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Posted on Mar 2, 2014, 9:18 pm

#30

I have fear to loss some mm when the doctor removes the device. i am interesting in external only and my goal is 5 cm, but i think in

LON too because i think the new bone and nail is more much solid and reliable that only the new bone. i'm thinking in doctor salameh.

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