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Sharon
With the element of risk involved here, it is most logical to suggest some sort of physical restriction. Granted, some might know some of the data as far as healing time is concerned and it could be a short period of time with children, others might not know about new data and it is just safer for the Doctors to tell patients "take it easy" With children, that's impossible and a Doctor might say don't worry about restricting your children. Tying your kids up and locking them in the closet till they heal wont work!
The period of time that is used is gathered from available research. They could have a record of a very short time, much shorter that 6 months, but then again it would be wise to round up higher and be safe with the 6 month figure. Its all about statistics and rounding. This data is thought out very carefully and published and is the standard. It is gathered from different groups of patients.
The parameters here vary quite a bit from healing and fusion rates for an infant vs a 100 year old individual. Babies have the stem cells working overtime and unfortunately the elder patient doesn't have that going for them. Cells just don't have the ability to regenerate when older and that's why this research is so important. ( I know I sound like Nancy Reagan).
They are not pulling this out of thin air due to the fact that they have been working on BMP for the last 50 years. There is data on bone fusion someplace and my suggestion would be watch all of these videos first. You could also contact Dr Jens Chapman up at University of Washington
http://www.researchchannel.org/prog/...t.aspx?fID=569
type in scoliosis, scoliosis fusion or anything of intrest
Most people think that if something is made of "metal" that it is impervious to destruction.This is not the case. Its funny how we are switching to ceramics, composites, plastics and polymers in quite a few of our military applications.
As far as the material selection is concerned, quite a few factors are weighed out and of course the material has to be malleable and it also has to be corrosion resistant. Titanium is known by the general public as being light in weight hence bicycle parts.
It is very resistant to corrosion. It is used in underwater submarines ROVs due to that fact. Salt water tests are performed on metals for corrosion. This data is available through Carpenter Technologies in Redding, Penn.
My hardware was produced by Synthes. Dr Menmuir selected the Pangea system for me.
http://us.synthes.com/Products/Spine...gea+System.htm
This will keep you busy for a while! LOL
The screws have a non-linear pitch dia, and non linear lead. I'm assuming elliptical. I'm assuming that with all the research done through the years with all the Doctors and Engineers they decided that they wanted the screws torqued at 15Nm. With the screw constantly tightening down as it is driven, the bone material compresses and chips due to bone being a hard material and until the adhesion occurs there could be a possibility of it backing out and loosening. I don't know what this time period is, its a good question.
Since the rods have to be bent to conform to the needed shape,the weakest point will be at the bends. If someone bends the rods then the area around the cage will be altered and I'm guessing that that isn't all that good. The cage could move and that could be a problem with saggital and coronal balance hence more surgery to correct the problem. I wouldn't think you would want to heal crooked.
I don't know why a non union would occur, I do know that the older you are, your chances are higher, and this is why they selected to use BMP on me. One would think that any movement would be detrimental to fusion.
One thing that is interesting is the fact that rods will break with a non-union. From what I've read, it always happens. It must be the fatigue factor from the movement. Like taking a carrot and bending it back and forth till it breaks. I wonder why they just don't go larger in diameter on the rods?
cont
With the element of risk involved here, it is most logical to suggest some sort of physical restriction. Granted, some might know some of the data as far as healing time is concerned and it could be a short period of time with children, others might not know about new data and it is just safer for the Doctors to tell patients "take it easy" With children, that's impossible and a Doctor might say don't worry about restricting your children. Tying your kids up and locking them in the closet till they heal wont work!
The period of time that is used is gathered from available research. They could have a record of a very short time, much shorter that 6 months, but then again it would be wise to round up higher and be safe with the 6 month figure. Its all about statistics and rounding. This data is thought out very carefully and published and is the standard. It is gathered from different groups of patients.
The parameters here vary quite a bit from healing and fusion rates for an infant vs a 100 year old individual. Babies have the stem cells working overtime and unfortunately the elder patient doesn't have that going for them. Cells just don't have the ability to regenerate when older and that's why this research is so important. ( I know I sound like Nancy Reagan).
They are not pulling this out of thin air due to the fact that they have been working on BMP for the last 50 years. There is data on bone fusion someplace and my suggestion would be watch all of these videos first. You could also contact Dr Jens Chapman up at University of Washington
http://www.researchchannel.org/prog/...t.aspx?fID=569
type in scoliosis, scoliosis fusion or anything of intrest
Most people think that if something is made of "metal" that it is impervious to destruction.This is not the case. Its funny how we are switching to ceramics, composites, plastics and polymers in quite a few of our military applications.
As far as the material selection is concerned, quite a few factors are weighed out and of course the material has to be malleable and it also has to be corrosion resistant. Titanium is known by the general public as being light in weight hence bicycle parts.
It is very resistant to corrosion. It is used in underwater submarines ROVs due to that fact. Salt water tests are performed on metals for corrosion. This data is available through Carpenter Technologies in Redding, Penn.
My hardware was produced by Synthes. Dr Menmuir selected the Pangea system for me.
http://us.synthes.com/Products/Spine...gea+System.htm
This will keep you busy for a while! LOL
The screws have a non-linear pitch dia, and non linear lead. I'm assuming elliptical. I'm assuming that with all the research done through the years with all the Doctors and Engineers they decided that they wanted the screws torqued at 15Nm. With the screw constantly tightening down as it is driven, the bone material compresses and chips due to bone being a hard material and until the adhesion occurs there could be a possibility of it backing out and loosening. I don't know what this time period is, its a good question.
Since the rods have to be bent to conform to the needed shape,the weakest point will be at the bends. If someone bends the rods then the area around the cage will be altered and I'm guessing that that isn't all that good. The cage could move and that could be a problem with saggital and coronal balance hence more surgery to correct the problem. I wouldn't think you would want to heal crooked.
I don't know why a non union would occur, I do know that the older you are, your chances are higher, and this is why they selected to use BMP on me. One would think that any movement would be detrimental to fusion.
One thing that is interesting is the fact that rods will break with a non-union. From what I've read, it always happens. It must be the fatigue factor from the movement. Like taking a carrot and bending it back and forth till it breaks. I wonder why they just don't go larger in diameter on the rods?
cont
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