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Bone mineral content measurement in small infants by single-photon absorptiometry: current methodologic issues
J J Steichen1, P A Asch, R C Tsang
1University of Cincinnati College of Medicine, Department of Pediatrics, OH 45267-0541.
Insights
Single-photon absorptiometry (SPA) accurately measures infant bone mineralization, particularly in the radius. This method is valuable for research on fetal and infant bone health, despite limited direct clinical use.
Area of Science:
- Pediatrics
- Biophysics
- Radiology
Background:
- Single-photon absorptiometry (SPA) has been used since 1963 to assess bone mineralization.
- Adapted for infants in 1976, SPA is crucial for studying fetal and postnatal bone development.
Purpose of the Study:
- To evaluate the utility of SPA for quantifying bone mineral content (BMC) in infants.
- To identify the optimal bone site for BMC measurement in infants using SPA.
Main Methods:
- Utilized single-photon absorptiometry (SPA) to measure bone mineral content (BMC).
- Focused on peripheral bones, primarily the radius, ulna, and humerus.
- Assessed the accessibility, accuracy, and precision of BMC measurement at different sites.
Main Results:
- The radius is identified as the preferred site for infant BMC measurement due to accessibility and measurement consistency.
- SPA demonstrated high precision and accuracy for radial BMC quantitation in infants.
- The technique is suitable for longitudinal studies and investigating conditions like rickets and osteopenia.
Conclusions:
- Single-photon absorptiometry (SPA) is a precise and accurate method for measuring infant bone mineral content, especially at the radius.
- SPA is a valuable research tool for understanding infant bone health and disease, though clinical diagnostic applications are limited.
Abstract:
Single-photon absorptiometry (SPA), developed in 1963 and adapted for infants by Steichen et al. in 1976, is an important tool to quantitate bone mineralization in infants. Studies of infants in which SPA was used include studies of fetal bone mineralization and postnatal bone mineralization in very low birth weight infants. The SPA technique has also been used as a research tool to investigate longitudinal bone mineralization and to study the effect of nutrition and disease processes such as rickets or osteopenia of prematurity. At present, it has little direct clinical application for diagnosing bone disease in single patients. The bones most often used to measure bone mineral content (BMC) are the radius, the ulna, and, less often, the humerus. The radius appears to be preferred as a suitable bone to measure BMC in infants. It is easily accessible; anatomic reference points are easily palpated and have a constant relationship to the radial mid-shaft site; soft tissue does not affect either palpation of anatomic reference points or BMC quantitation in vivo. The peripheral location of the radius minimizes body radiation exposure. Trabecular and cortical bone can be measured separately. Extensive background studies exist on radial BMC in small infants. Most important, the radius has a relatively long zone of constant BMC. Finally, SPA for BMC in the radius has a high degree of precision and accuracy.