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A new tracer method for the calculation of rates of bone formation and breakdown in osteoporosis and other generalised skeletal disorders

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Abstract

  1. 1.

    Evidence has accumulated that the rate of acceretion (A) of calcium to bone is the sum of two fluxes; apposition involving the laying down of new bone and augmentation which is the result of slow exchange of non-surface bone calcium with plasma calcium pools as the result of solid state diffusion.

  2. 2.

    A method has been devised for separating A into its two components. It requires the use of45Ca or, for clinical studies,85Sr as a calcium tracer. Studies which are initiated with a combined accretion rate-calcium balance study, are concluded with an estimate of the exponent of the power function which has been found to describe the whole body retention of tracer from the second month onward.

  3. 3.

    The impulse response function of the skeleton for the tracer is then calculated, making the assumption that in any uniform volume of bone, osteoclastic resorption is a first order process. Making in addition certain simplifying assumptions, which are shown to have a modest influence on the final results, a mean rate of bone resorption can be calculated using a development of the well known Stewart-Hamilton formula. The apposition rate is calculated as the sum of the resorption rate and the calcium balance. Augmentation and diminution, defined as equal and opposite exchange processes, are given by the difference between A and the apposition rate.

  4. 4.

    The results of our first thirteen studies in normal subjects and patients with metabolic bone disease are presented, together with analyses of some data from the literature. It is concluded that the development of an atraumatic method for measuring rates of bone formation and resorption in the whole body would be an important advance in the study of metabolic bone disease, and this work is presented so that critical comparisons may be initiated between this tracer method and independent histological methods for measuring these parameters.

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Authors and Affiliations

  1. Radioisotopes Division, MRC Clinical Research Centre, Watford Road, HA1 3UJ, Harrow, Middlesex, UK

    J. Reeve, R. Hesp & R. Wootton

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  1. J. Reeve
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  2. R. Hesp
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  3. R. Wootton
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Reeve, J., Hesp, R. & Wootton, R. A new tracer method for the calculation of rates of bone formation and breakdown in osteoporosis and other generalised skeletal disorders. Calc. Tis Res. 22, 191–206 (1977). https://doi.org/10.1007/BF02010358

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  • DOI: https://doi.org/10.1007/BF02010358

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