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Quantitative [18F]-Naf-PET-MRI Analysis for the Evaluation of Dynamic Bone Turnover in a Patient with Facetogenic Low Back Pain
Published on: August 8, 2019
Differences in regional bone metabolism at the spine and hip: a quantitative study using (18)F-fluoride positron
T Puri1, M L Frost, K M Curran
1King's College London, PET Imaging Centre, Imaging Sciences and Biomedical Engineering, St. Thomas' Hospital, London, UK. tanujpuri82@gmail.com
Insights
Bone blood flow and fluoride clearance are three times lower at the hip compared to the lumbar spine. This positron emission tomography study reveals significant regional differences in bone metabolism.
Area of Science:
- Nuclear medicine
- Bone metabolism
- Positron emission tomography (PET) imaging
Background:
- Positron emission tomography (PET) with (18)F-fluoride allows quantitative assessment of regional bone metabolism.
- (18)F-fluoride kinetics, including effective bone plasma flow (K(1)) and bone plasma clearance (K(i)), and standardized uptake values (SUV) are key metrics.
- Understanding regional differences in bone metabolism is crucial for interpreting skeletal imaging findings.
Purpose of the Study:
- To compare regional (18)F-fluoride kinetics and SUV at the hip and lumbar spine (LS).
- To investigate potential differences in bone blood flow and fluoride uptake between these major skeletal sites.
Main Methods:
- Twelve healthy postmenopausal women underwent dynamic 60-min (18)F-PET scans at the lumbar spine and proximal femur.
- Measurements included effective bone plasma flow (K(1)), bone plasma clearance (K(i)), and standardized uptake values (SUV).
- Statistical analysis used the Kruskal-Wallis test with Bonferroni correction to compare kinetic parameters across different skeletal regions.
Main Results:
- Bone blood flow (K(1)), plasma clearance (K(i)), and SUV were approximately three times lower at the hip (femoral neck, total hip, femoral shaft) compared to the lumbar spine (L1-L4).
- Within the proximal femur, the femoral shaft showed lower K(i) and SUV than the femoral neck and total hip.
- The volume of distribution was also lower at the total hip and femoral shaft compared to the lumbar spine.
Conclusions:
- Regional bone blood flow and (18)F-fluoride plasma clearance are significantly lower at the hip than the lumbar spine.
- These findings suggest that reduced bone blood flow in the proximal femur is a primary factor explaining the observed differences in bone fluoride kinetics.
- Positron emission tomography provides valuable insights into site-specific bone metabolic differences.
Summary:
This study showed that regional bone blood flow and (18)F-fluoride bone plasma clearance measured by positron emission tomography are three times lower at the hip than the lumbar spine.
Introduction:
Measurements of effective bone plasma flow (K (1)), bone plasma clearance (K ( i )) and standardised uptake values (SUV) using (18)F-fluoride positron emission tomography ((18)F-PET) provide a useful means of studying regional bone metabolism at different sites in the skeleton. This study compares the regional (18)F-fluoride kinetics and SUV at the hip and lumbar spine (LS).
Methods:
Twelve healthy postmenopausal women with no history of metabolic bone disease apart from two with untreated osteoporosis were recruited. Each subject underwent 60-min dynamic (18)F-PET scans at the LS and proximal femur two weeks apart. K (1), K ( i ) and SUV were measured at the LS (mean of L(1)-L(4)), femoral neck (FN), total hip (TH) and femoral shaft (FS). Differences between sites were assessed using the nonparametric Kruskal-Wallis test with a Bonferroni correction for multiple comparisons.
Results:
Values of K (1), K ( i ) and SUV at the FN, TH and FS were three times lower than at the LS (p = 0.003). Amongst the proximal femur sites, K ( i ) and SUV were lower at the FS compared with the FN and TH, and SUV was lower at the TH compared with the FN (all p < 0.05). The volume of distribution was lower at the TH and FS compared with the LS (p < 0.05).
Conclusion:
The lower values of K (1), K ( i ) and SUV at the hip suggest that lower bone blood flow in the proximal femur is an important factor explaining the principal reason for the differences in bone fluoride kinetics between the LS and hip sites.
