| 1. |
- Bengner, Urban, et al.
(författare)
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Changes in incidence and prevalence of vertebral fractures during 30 years
- 1988
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Ingår i: Calcified Tissue International. - 1432-0827. ; 42:5, s. 293-296
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Tidskriftsartikel (refereegranskat)abstract
- The age and sex-specific incidence and prevalence of vertebral compression fractures were compared between the 1950s and 1980s in an urban population. In women over 80 years of age the incidence of symptomatic vertebral fractures has increased approximately four times; in elderly men even more. Mainly, low-energy trauma has caused these fractures. Thus, one clinical manifestation of osteoporosis--vertebral fracture--has increased in number, incidence, and prevalence over the last 30 years.
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| 2. |
- Bengner, Urban, et al.
(författare)
-
Changes in the incidence of fracture of the upper end of the humerus during a 30-year period. A study of 2125 fractures
- 1988
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Ingår i: Clinical Orthopaedics and Related Research. - 0009-921X. ; 231, s. 179-182
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Tidskriftsartikel (refereegranskat)abstract
- The incidence of fracture of the upper end of the humerus by age group and sex was studied for a 32-year period from 1950 to 1982. The following numbers of humeral fractures occurred: 1950-1954, 411 fractures; 1961-1964, 552 fractures; 1971-1973, 639 fractures; and 1981-1982, 523 fractures. There was a progressive increase in the age-related incidence in older persons, especially in women. There was a higher incidence of fractures classified as severe in the 1980s compared with the 1950s.
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| 3. |
- Nilsson, M, et al.
(författare)
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Quantitative computed tomography in measurement of vertebral trabecular bone mass. A modified method
- 1988
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Ingår i: Acta Radiologica. - 1600-0455. ; 29:6, s. 719-725
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Tidskriftsartikel (refereegranskat)abstract
- Measurement of bone mineral concentration (BMC) can be done by several modalities. Quantitative computed tomography (QCT) can be used for measurements at different sites and with different types of bone (trabecular-cortical). This study presents a modified method reducing the influence of fat. Determination of BMC was made from measurements with single-energy computed tomography (CT) of the mean Hounsfield number in the trabecular part of the L1 vertebra. The method takes into account the age-dependent composition of the trabecular part of the vertebra. As the amount of intravertebral fat increases with age, the effective atomic number for these parts decreases. This results in a non-linear calibration curve for single-energy CT. Comparison of BMC values using the non-linear calibration curve or the traditional linear calibration with those obtained with a pixel-by-pixel based electron density calculation method (theoretically better) showed results clearly in favor of the non-linear method. The material consisted of 327 patients aged 6 to 91 years, of whom 197 were considered normal. The normal data show a sharp decrease in trabecular bone after the age of 50 in women. In men a slower decrease was found. The vertebrae were larger in men than in women.
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