losing height gain from compression?

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Quote from: Slim_tim on January 12, 2014, 02:13:49 PMIt is spine compression. Deal with it.

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Quote from: Smallguy on January 12, 2014, 02:44:09 PMHey Wannabegiant.

You only wear the external fixture during the lengthening phase. And any lost you made during your lengthening phase you can make up for. It just means you have to spend more time lengthening.

He measured his height several times when he came back home. And his noticed his height lost yesterday? And his bones were already 98% consolidated. I don't know. Personally, these are my speculations

1. Inaccurate measurement before (eg. measuring standing on ballerina foot)

2. Spinal compression?

Yup, I have no clue.

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Quote from: Medium Drink Of Water on January 12, 2014, 11:52:50 PMMost pin bending happens in the beginning.  Once they've bent however much they're going to bend from bearing your weight and resisting lengthening, they're done bending.

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Quote from: Adriano on January 13, 2014, 10:08:47 AM1) if u cut a piece of timber with a saw and put it back together,  the 2 parts  put together are shorter than the original length of the uncut piece of timber.

2) our leg bones ( especially) femurs are not 100% vertical.

this is why amount lengthened is always greater than actual height gained.

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Quote from: Kilokahn on January 13, 2014, 07:10:02 PMNot entirely sure this has to do with the topic at hand, but this is what Dr. Parihar wrote about compression during the consolidation phase of lengthening.

At the end of distraction, Ilizarov recommends "training the regenerate'. Simply put, this involves overlengthening the limb by 7 to 10 mm and then compressing this back to the proper length in a gradual fashion. This ensures a larger cross sectional area of regenerate to participate in the consolidation. The fixator has to be neutralized to ensure that the weight bearing stresses will be transferred to the newly formed osseous tissue. Neutralization is achieved by reversing (compressing) the rings at a rate of 0.25 mm an alternate days till the rings no longer move towards each other. At this point there is no more tension in the system, and most of the weight bearing forces are transmitted through the bone. This procedure may render the wires relatively lax, and they may need to be tensioned if the patient complains of pain or instability can be demonstrated. At this time a monthly follow up will usually suffice. During the consolidation phase the risk of complications is reduced markedly, and the patient's functional abilities increase. Movement and ambulation are encouraged to ensure a speedy consolidation of the regenerate.

Was thinking that if you overlengthen the limb by 7 to 10 mm as he says, then when you compress gradually until you hit the intended length, you wouldn't have any more room for compression afterward. Just an idea. Might be looking at this the wrong way.

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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.

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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.

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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.

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