Skeleton Pirate

Skeleton Pirate
Artist: LindaB

WELCOME TO STRONTIUM FOR BONES BLOG

Have you experienced, or read about, negative, and even dangerous, side effects from Fosamax (alendronate), Boniva (ibandronate), Actonel (risedronate), and other bisphosphonates prescribed for osteoporosis? If you have, then rest assured there is a safe, effective treatment for this condition. Strontium, primarily in the form of strontium citrate, is taken orally once a day.

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Sunday, September 21, 2014

Long-Term Effect of Strontium Ranelate Treatment on BMD



http://onlinelibrary.wiley.com/doi/10.1359/JBMR.050810/full

In the SOTI trial, there were impressive BMD increases in the spine (12.7%) and total hip (8.6%). However, some caution is necessary in interpreting these results because much of this effect is caused by the higher atomic number of strontium (Z = 38) compared with calcium (Z = 20). When BMD is measured by DXA, strontium atoms in bone attenuate X-rays more strongly than calcium atoms. However, when the DXA scanner software calculates BMD from the measured X-ray transmission factors, the increased attenuation caused by bone strontium content (BSC) is interpreted as increased calcium content and will cause an artifactual increase in BMD. After the adjustment for BSC using Eq. 1, the measured BMD increase in the spine at 3 years of 12.7% was corrected to 6.8%.

The correction of the bone mineral content (BMD) changes found in the strontium ranelate trials for bone strontium content (BSC) was based on the following equation:

Adjusted BMD = Measured lumbar spine BMD /1+ 0.061 x BSC iliac crest % Eq. 1

“Although a commendable effort was made in the SOTI trial to correct the BMD data for the atomic number effect of strontium, there is clearly considerable uncertainty about the accuracy of the corrections made. This arises from the small number of subjects in whom iliac crest bone biopsy was performed and the reliance on animal data for the correction factor for inferring BSC in the spine.”

No human studies with strontium ranelate have yet reported how quickly bone strontium is washed out once treatment is stopped. However, on the basis of the ICRP strontium model, we can estimate the likely long-term retention. Figure 2 shows the results of calculations using the ICRP model to predict the long-term changes in BMD after 3 months, 1 year, and 3 years of treatment with strontium ranelate. The calculations make the following assumptions: (1) equal daily intake of strontium during the treatment period; (2) strontium intake ceases at the end of treatment; and (3) no true loss of bone is occurring. On the basis of the ICRP model, much of the strontium present in bone at the end of treatment is likely to still be there a decade later. If strontium ranelate treatment is given for >1 year, this long-term retention in bone is likely to have a significant effect on the interpretation of future BMD measurements.






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Wandering Skeleton

Wandering Skeleton
Artist: Joel Hoekstra

Osteoporotic Bone

Osteoporotic Bone
Source: www.mayoclinic.com

How Strontium Builds Bones

Strontium is a mineral that tends to accumulate in bone. Studies have shown that oral doses of strontium are a safe and effective way to prevent and reverse osteoporosis. Doses of 680 mg per day appear to be optimal. See my "For More Information About Strontium" links section.

Osteoporosis is caused by changes in bone production. In healthy young bones there is a constant cycle of new bone growth and bone removal. With age, more bone is removed and less new bone is produced. The bones become less dense and thus more fragile.

Scientists believe that strontium works in two ways. It may stimulate the replication of pre-osteoblasts, leading to an increase in osteoblasts (cells that build bone). Strontium also directly inhibits the activity of osteoclasts (cells that break down bone). The result is stronger bones.

When taking strontium, be sure to take 1200 mg calcium, 1000 IU vitamin D3, and 500 mg magnesium daily. It is best to take strontium late at night on an empty stomach. Calcium and strontium may compete with each other for absorption if taken together.