Stellenwert der Osteoporose in der traumatologischen Diagnostik

The use of flat panel volumetric computed tomography (fpVCT) in osteoporosis research

RATIONALE AND OBJECTIVES

Improvements in imaging technology have led to the increased use of computed tomography (CT). For example, micro-CT and quantitative CT (QCT) are now often used in osteoporosis research, in which micro-CT is able to analyze small bones or bone samples with high spatial resolution. In contrast, QCT is able to investigate large samples with low spatial resolution. The aim of this study was to test the usefulness of flat-panel volumetric CT (fpVCT) in a rat model of osteopenia.

MATERIAL AND METHODS

Twenty-two 3-month-old rats underwent ovariectomy and were either left untreated or supplemented with estradiol for 15 weeks. After sacrificing, the rats' second lumbar vertebral body bone mineral density (BMD) was analyzed using fpVCT and ashing. The results were compared to those of a microstructural analysis of the first lumbar vertebrae and a biomechanical evaluation of the fourth lumbar vertebrae.

RESULTS

BMD measurements using both fpVCT (0.39 vs 0.35 mg/cm(3)) and ashing (0.52 vs 0.48 mg/cm(3)) demonstrated a significant improvement after estradiol supplementation. The correlation coefficient of the two methods was 0.858. After estradiol supplementation, the bone microstructural and bone biomechanical parameters were improved, compared to no treatment. The correlations of both the microstructural and the biomechanical evaluations were closer for BMD measured using fpVCT (r = 0.482-0.769) than on the basis of ashing (r = 0.345-0.573). FpVCT was not able to display the trabecular microstructure of the rat lumbar vertebrae.

CONCLUSION

The use of fpVCT demonstrated a close relationship between morphologic and biomechanical evaluations in a rat model of osteopenia. Because of its different proportions, fpVCT might be able to bridge the gap between micro-CT and QCT in analyzing larger animals.

[Osteoporosis and falls in Germany: health care for the elderly with an increased risk for fractures]

Fractures are a considerable risk, especially in older patients. The fracture of the proximal femur is of particular relevance. Functional deficiency, an increased need for care and assistance and a limitation of the quality of life after a fracture lead to an increase in morbidity and mortality among patients who lived independently prior to the event in most cases. The risk of suffering a femoral fracture mainly depends on two risk factors: osteoporosis and falls. Both can be influenced and are therefore suitable for interventions. National and international guidelines for diagnosis and treatment have so far separately addressed deficiencies in bone stability and neuromuscular function. The current German DVO guideline is the first to consider both aspects simultaneously and develop an individual concept for diagnosis and therapy depending on a risk prediction of a fracture within the following 10 years. The evaluation of the current quality of health care in the field of osteoporosis and falls both nationally and internationally seems to be hardly possible. Merely the delivery of DXA measurements and medication for osteoporosis are assessable. In these sectors a deficiency in the delivery of care is apparent. Standardized evaluations of the implementation of guidelines are needed to assess deficiencies and reveal options for improving quality of care in the future.