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Hewitt-Dedman CL, Kershaw LE, Schwarz T, Del-Pozo J, Duncan J, Daniel CR, Cillán-García E, Pressanto MC, Taylor SE. Preliminary study of proton magnetic resonance spectroscopy to assess bone marrow adiposity in the third metacarpus or metatarsus in Thoroughbred racehorses. Equine Vet J 2024. [PMID: 38699829 DOI: 10.1111/evj.14086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 03/07/2024] [Indexed: 05/05/2024]
Abstract
BACKGROUND Magnetic resonance spectroscopy (MRS) has been used to investigate metabolic changes within human bone. It may be possible to use MRS to investigate bone metabolism and fracture risk in the distal third metacarpal/tarsal bone (MC/MTIII) in racehorses. OBJECTIVES To determine the feasibility of using MRS as a quantitative imaging technique in equine bone by using the 1H spectra for the MC/MTIII to calculate fat content (FC). STUDY DESIGN Observational cross-sectional study. METHODS Limbs from Thoroughbred racehorses were collected from horses that died or were subjected to euthanasia on racecourses. Each limb underwent magnetic resonance imaging (MRI) at 3 T followed by single-voxel MRS at three regions of interest (ROI) within MC/MTIII (lateral condyle, medial condyle, proximal bone marrow [PBM]). Percentage FC was calculated at each ROI. Each limb underwent computed tomography (CT) and bone mineral density (BMD) was calculated for the same ROIs. All MR and CT images were graded for sclerosis. Histology slides were graded for sclerosis and proximal marrow space was calculated. Pearson or Spearman correlations were used to assess the relationship between BMD, FC and marrow space. Kruskal-Wallis tests were used to check for differences between sclerosis groups for BMD or FC. RESULTS Eighteen limbs from 10 horses were included. A negative correlation was identified for mean BMD and FC for the lateral condyle (correlation coefficient = -0.60, p = 0.01) and PBM (correlation coefficient = -0.5, p = 0.04). There was a significant difference between median BMD for different sclerosis grades in the condyles on both MRI and CT. A significant difference in FC was identified between sclerosis groups in the lateral condyle on MRI and CT. MAIN LIMITATIONS Small sample size. CONCLUSIONS 1H Proton MRS is feasible in the equine MC/MTIII. Further work is required to evaluate the use of this technique to predict fracture risk in racehorses.
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Affiliation(s)
- Charlotte L Hewitt-Dedman
- Royal (Dick) School of Veterinary Studies and Roslin Institute, The University of Edinburgh, Roslin, UK
| | - Lucy E Kershaw
- BHF Centre for Cardiovascular Science and Edinburgh Imaging, University of Edinburgh, Edinburgh, UK
| | - Tobias Schwarz
- Royal (Dick) School of Veterinary Studies and Roslin Institute, The University of Edinburgh, Roslin, UK
| | - Jorge Del-Pozo
- Royal (Dick) School of Veterinary Studies and Roslin Institute, The University of Edinburgh, Roslin, UK
| | - Juliet Duncan
- Royal (Dick) School of Veterinary Studies and Roslin Institute, The University of Edinburgh, Roslin, UK
| | - Carola R Daniel
- Royal (Dick) School of Veterinary Studies and Roslin Institute, The University of Edinburgh, Roslin, UK
| | - Eugenio Cillán-García
- Royal (Dick) School of Veterinary Studies and Roslin Institute, The University of Edinburgh, Roslin, UK
| | - Maria Chiara Pressanto
- Royal (Dick) School of Veterinary Studies and Roslin Institute, The University of Edinburgh, Roslin, UK
| | - Sarah E Taylor
- Royal (Dick) School of Veterinary Studies and Roslin Institute, The University of Edinburgh, Roslin, UK
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Beekman KM, Regenboog M, Nederveen AJ, Bravenboer N, den Heijer M, Bisschop PH, Hollak CE, Akkerman EM, Maas M. Gender- and Age-Associated Differences in Bone Marrow Adipose Tissue and Bone Marrow Fat Unsaturation Throughout the Skeleton, Quantified Using Chemical Shift Encoding-Based Water-Fat MRI. Front Endocrinol (Lausanne) 2022; 13:815835. [PMID: 35574007 PMCID: PMC9094426 DOI: 10.3389/fendo.2022.815835] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 03/17/2022] [Indexed: 01/17/2023] Open
Abstract
Bone marrow adipose tissue (BMAT) is a dynamic tissue which is associated with osteoporosis, bone metastasis, and primary bone tumors. The aim of this study is to determine region-specific variations and age- and gender-specific differences in BMAT and BMAT composition in healthy subjects. In this cross-sectional study, we included 40 healthy subjects (26 male: mean age 49 years, range 22-75 years; 14 female: mean age 50 years, range 29-71) and determined the bone marrow signal fat fraction and bone marrow unsaturation in the spine (C3-L5), pelvis, femora, and tibiae using chemical shift encoding-based water-fat imaging (WFI) with multiple gradient echoes (mGRE). Regions of interest covered the individual vertebral bodies, pelvis and proximal epimetaphysis, diaphysis, and distal epimetaphysis of the femur and tibia. The spinal fat fraction increased from cervical to lumbar vertebral bodies (mean fat fraction ( ± SD or (IQR): cervical spine 0.37 ± 0.1; thoracic spine 0.41 ± 0.08. lumbar spine 0.46 ± 0.01; p < 0.001). The femoral fat fraction increased from proximal to distal (proximal 0.78 ± 0.09; diaphysis 0.86 (0.15); distal 0.93 ± 0.02; p < 0.001), while within the tibia the fat fraction decreased from proximal to distal (proximal 0.92 ± 0.01; diaphysis 0.91 (0.02); distal 0.90 ± 0.01; p < 0.001). In female subjects, age was associated with fat fraction in the spine, pelvis, and proximal femur (ρ = 0.88 p < 0.001; ρ = 0.87 p < 0.001; ρ = 0.63 p = 0.02; ρ = 0.74 p = 0.002, respectively), while in male subjects age was only associated with spinal fat fraction (ρ = 0.40 p = 0.04). Fat fraction and unsaturation were negatively associated within the spine (r = -0.40 p = 0.01), while in the extremities fat fraction and unsaturation were positively associated (distal femur: r = 0.42 p = 0.01; proximal tibia: r = 0.47, p = 0.002; distal tibia: r = 0.35 p = 0.03), both independent of age and gender. In conclusion, we confirm the distinct, age- and gender-dependent, distribution of BMAT throughout the human skeleton and we show that, contradicting previous animal studies, bone marrow unsaturation in human subjects is highest within the axial skeleton compared to the appendicular skeleton. Furthermore, we show that BMAT unsaturation was negatively correlated with BMAT within the spine, while in the appendicular skeleton, BMAT and BMAT unsaturation were positively associated.
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Affiliation(s)
- Kerensa M. Beekman
- Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centers, Amsterdam Movement Sciences, University of Amsterdam, Amsterdam, Netherlands
- Department of Endocrinology, Amsterdam University Medical Centers, Amsterdam Movement Sciences, Vrije Universiteit University, Amsterdam, Netherlands
| | - Martine Regenboog
- Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centers, Amsterdam Movement Sciences, University of Amsterdam, Amsterdam, Netherlands
- Department of Endocrinology and Metabolism, Amsterdam University Medical Centers, Amsterdam Movement Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Aart J. Nederveen
- Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centers, Amsterdam Movement Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Nathalie Bravenboer
- Department of Clinical Chemistry, Research Laboratory Bone and Calcium Metabolism, Amsterdam University Medical Centers, Amsterdam Movement Sciences, Vrije Universiteit University, Amsterdam, Netherlands
- Department of Internal Medicine, Leiden University Medical Center, Leiden, Netherlands
| | - Martin den Heijer
- Department of Endocrinology, Amsterdam University Medical Centers, Amsterdam Movement Sciences, Vrije Universiteit University, Amsterdam, Netherlands
| | - Peter H. Bisschop
- Department of Endocrinology and Metabolism, Amsterdam University Medical Centers, Amsterdam Movement Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Carla E. Hollak
- Department of Endocrinology and Metabolism, Amsterdam University Medical Centers, Amsterdam Movement Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Erik M. Akkerman
- Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centers, Amsterdam Movement Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Mario Maas
- Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centers, Amsterdam Movement Sciences, University of Amsterdam, Amsterdam, Netherlands
- *Correspondence: Mario Maas,
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