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Author Topic: How much is lost to curvature on 8cm femurs typically  (Read 600 times)

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oklama

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How much is lost to curvature on 8cm femurs typically
« on: December 24, 2024, 05:23:18 PM »

Activatedxx told me he lost about 1cm to it but the numbers I saw previously were much lower. Anyone got a good number on this or a paper with stats on it?
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21 yrs old
goal: 173/ 180cm (8cm + 7cm if possible)
Primarily looking at Assayag for Femurs and Assayag or Paley for Tibia.
Plan to do Humerus between femurs and tibs too (Only 5'6 wingspan)

KiloKAHN

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Re: How much is lost to curvature on 8cm femurs typically
« Reply #1 on: December 24, 2024, 10:48:22 PM »

Activatedxx told me he lost about 1cm to it but the numbers I saw previously were much lower. Anyone got a good number on this or a paper with stats on it?

Here's what Dr Birkholtz had to say about actual height gained compared to distraction with femur lengthening:

Yes with exfixes we lengthen along the mechanical axis which should correspond pretty much to patient height. With femoral nails, we tend to lengthen along the anatomic axis, which might not correspond perfectly to height gain (it is oblique). It is well described too that patients end up with 5-10 mm less than expected. I would suggest going 1cm beyond target length and then backing the nail up by 5mm. This would ensure quick consolidation. The downside of long lengthenings along the anatomic axis (like with precice, guichet, betzbone, iskd), is that we change the mechanical alignment of the femur, as we lengthen along a different axis. This means that intramedullary lengthenings in the femur beyond 5-6cm will inevitably lead to slight malalignment. This may in time lead to arthritis.
In short, keep to reasonable distances and go to a doc that understands this.
Standing xrays can be taken with Precice nails with certain precautions.

http://www.limblengtheningforum.com/index.php?topic=413.msg6957#msg6957
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Initial height: 164 cm / ~5'5" (Surgery on 6/25/2014)
Current height: 170 cm / 5'7" (Frames removed 6/29/2015)
External Tibia lengthening performed by Dr Mangal Parihar in Mumbai, India.
My Cosmetic Leg Lengthening Experience

oklama

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Re: How much is lost to curvature on 8cm femurs typically
« Reply #2 on: December 25, 2024, 12:20:12 AM »

Here's what Dr Birkholtz had to say about actual height gained compared to distraction with femur lengthening:

http://www.limblengtheningforum.com/index.php?topic=413.msg6957#msg6957

This is talking about exfixes, here hes insinuating that precise will give a full height gain in femurs. has that proven true for patients?
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21 yrs old
goal: 173/ 180cm (8cm + 7cm if possible)
Primarily looking at Assayag for Femurs and Assayag or Paley for Tibia.
Plan to do Humerus between femurs and tibs too (Only 5'6 wingspan)

oklama

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Re: How much is lost to curvature on 8cm femurs typically
« Reply #3 on: December 25, 2024, 12:24:17 AM »

Here's what Dr Birkholtz had to say about actual height gained compared to distraction with femur lengthening:

http://www.limblengtheningforum.com/index.php?topic=413.msg6957#msg6957

Ignore previous post I misread, hes actually saying the opposite. thats really unfortunate. idk what to do now.
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21 yrs old
goal: 173/ 180cm (8cm + 7cm if possible)
Primarily looking at Assayag for Femurs and Assayag or Paley for Tibia.
Plan to do Humerus between femurs and tibs too (Only 5'6 wingspan)

GrowGrow123

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Re: How much is lost to curvature on 8cm femurs typically
« Reply #4 on: December 27, 2024, 10:53:57 PM »

I did 8.3 cm femurs on Precice. As far as I can tell, I got pretty close to the full amount. Like at least 8cm. My understanding is that the femurs are not perfectly vertical from the ground, but the amount lost by that angle is quite minor. Someone did the math and it was like 0.15 cm if you do 8cm (although, of course, this angle is not necessarily exactly the same on a person to person basis and women, in particular, have a more oblique angle than men for obvious reasons).

I have heard of LON patients losing height as they consolidated, but never heard of this for Precice.
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5' 9.5" -> 6' 0.5" after Precise 2.2 Femurs in 2023
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