osteoporosis 2016 | dxa and beyond: dr nicola crabtree #osteo2016
TRANSCRIPT
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Dr Nicola Crabtree Principal Clinical Scientist & NIHR Post Doctoral Research Fellow
Birmingham Children’s Hospital / Queen Elizabeth Hospital Birmingham
Fracture Risk Assessment - DXA and
Beyond
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Osteoporosis – Conceptual definition “a skeletal disease, characterised by low
bone mass and micro-architectural deterioration of bone tissue, with a consequent increase in bone fragility and susceptibility to fracture”
Consensus development conference: diagnosis, prophylaxis and treatment of osteoporosis. Am J Med. 1993
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Osteoporosis – Operational definition Operationally defined by dual-energy X-ray
absorptiometry as 2.5 standard deviations or more below the young adult female mean (T-Score ≤ -2.5) measured at the femoral neck, total hip, or lumbar spine.
World Health Organisation. Assessment of fracture risk and its application to screening for postmenopausal osteoporosis (1994)
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Dual-Energy X-ray Absorptiometry
DXA Widely available 2-D Projection modality Short scan times Good precision Reliable reference ranges Low radiation exposure Inversely related to fracture
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DXA and Osteoporosis
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0
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120
1 0,5 0 -0,5 -1 -1,5 -2 -2,5 -3 -3,5 -4 -4,5 -5 -5,5
Femoral neck BMD (T-score Nhanes)
0
20
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EPISEM study; 6862 postmenopausal white women ≥70 years, randomly selected from population based listing - Mean f/u of 3.2 yrs. 678 OP fractures (hip, distal forearm, proximal humerus)
BMD distribution
No of women with fracturesFracture rate
Frac
ture
rat
e pe
r 10
00 P
erso
n-ye
ars
No of w
omen w
ith fractures
Courtesy of D Hans & MA Krieg – Adapted from the EPISEM Study
BMD overlaps in women with & without fracture
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Normal Bone Density BUT Vertebral Fracture
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High Bone Density & Vertebral Fracture
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Dual energy x-ray absorptiometry
BMD as measured by DXA represents an amalgamation of volumetric bone
density, bone size, microarchitecture and the material properties of bone.
DXA = areal Bone mineral Density (g/cm2)
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DXA Beyond BMD
re-visit conceptual definition“a skeletal disease, characterised by low
bone mass and micro-architectural deterioration of bone tissue, with a consequent increase in bone fragility and susceptibility to fracture”
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Bone Microarchitecture? Histomorphometry of trans illiac bone biopsy HRpQCT MRI
Not easily assessed clinically
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CAN WE ESTIMATE BONE MICRO-ARCHITECTURE
IN-VIVO?
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Trabecular Bone Score
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Trabecular Bone Score (TBS) Gray-level textural metric extracted from the two-dimensional
lumbar spine dual-energy absorptiometry TBS is related to bone microarchitecture and provides skeletal
information that is not captured from the standard bone density measurement
Based on experimental variograms of the projected DXA image. TBS has the potential to discern differences between DXA scans
that have similar BMD High TBS = Better skeletal micro structure Low TBS = Weaker micro structure
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Trabecular Bone Score (TBS)
Reproduced from Silva BC et al. JBMR 2014 [29], 3, 518-530
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Can’t see the wood for the trees?
High TBS
Low TBS
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Clinical Trabecular Bone Score (TBS)
TBS is processed in the same region of interest as BMD.
Bousson et al. Osteoporosis International 2011
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TBS – Manitoba Study 29,407 women over 50
years of age BMD Hip & spine 4.7 years follow up TBS 1668 osteoporotic
fractures BMD & TBS predicted
fractures equally well Combining BMD & TBS
improves the prediction
Hans et al. JBMR 2011
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TBS and Fracture
Silva BC et al. 2013 JBMR
Women Men
Prospective suggest that the TBS predicts risk of fracture
even after adjustment for BMD.
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TBS FRAX Meta-Analysis: Gradients of Risks per SD change in risk score
Age TBS onlyClinical risk factors
+ BMDClinical risk factors
+ BMD + TBS
Hip fracture50 1.51 (0.89 - 2.55) 4.03 (2.01 - 8.10) 5.09 (2.45 - 10.55)60 1.46 (1.01 - 2.11) 3.46 (2.13 - 5.62) 4.90 (2.80 - 8.56)70 1.41 (1.12 - 1.77) 2.97 (2.23 - 3.97) 4.72 (3.06 - 7.26)80 1.36 (1.18 - 1.57) 2.55 (2.14 - 3.05) 4.54 (3.06 - 6.74)90 1.31 (1.06 - 1.62) 2.19 (1.66 - 2.90) 4.37 (2.73 - 7.00)
Other MOP fractures50 1.54 (1.18 - 2.00) 1.56 (1.18 - 2.05) 1.62 (1.25 - 2.10)60 1.51 (1.26 - 1.79) 1.52 (1.26 - 1.84) 1.58 (1.33 - 1.88)70 1.47 (1.32 - 1.64) 1.49 (1.30 - 1.69) 1.54 (1.40 - 1.70)80 1.44 (1.29 - 1.61) 1.45 (1.28 - 1.65) 1.50 (1.37 - 1.64)90 1.41 (1.18 - 1.68) 1.42 (1.18 - 1.70) 1.46 (1.25 - 1.71)
EV McCloskey et al. on behalf of the FRAX meta-analysis working group – 2015
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Can TBS be usefully added to FRAX?
TBS yields risk which is independent of BMD independent of CRFs amenable to intervention clinically meaningful Sufficient level of evidence (many studies)
Validation cohort
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TBS Meta analysis → FRAX
TBS is predictor
of fracture risk
independent of
FRAX and BMD
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FRAX + NOGG
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FRAX with added TBS
High TBS reduces fracture risk
Low TBS increases fracture risk
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FRAX + NOGG + TBSLow TBS High TBS
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Disease specific– Type II Diabetes
Vestergaard et al OI 2007
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TBS – Type II Diabetes 29,407 women ≥50 years with baseline DXA
ANCOVA adjusted for age, BMI, glucocorticoids, prior major fracture, rheumatoid, arthritis, COPD, alcohol abuse and osteoporosis therapy.
Diabetes – No diabetesMean (95% CI)
Lumbar spine BMD (g/cm2)+0.031
(0.024 : 0.038)
Femoral neck BMD (g/cm2)+0.012
(0.007 : 0.016)
Trochanter BMD (g/cm2)+0.008
(0.003 : 0.013)
Total hip BMD (g/cm2)+0.019
(0.014 : 0.025)
Lumbar spine TBS (unitless)-0.051
(-0.056 : -0.046)
Leslie WD et al. JCEM 2013
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TBS is More Sensitive Than BMD to Diabetes-Related Fracture Risk
OR 0.66
OR 2.61
OR 0.68OR 0.80
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
L14 BMD Fem Neck BMD Total Hip BMD L14 TBS
Adj
uste
d O
R
Odds ratios (95% CI bars) for lowest vs highest tertile according to presence of diabetes (adjusted for age, BMI, osteoporosis therapy, glucocorticoids, prior fracture, rheumatoid arthritis, COPD, alcohol abuse).
Leslie WD et al. JCEM 2013
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TBS and Osteoporosis Treatment
Popp et al. 2012 JBMR Silva BC et al. 2013 JBMR
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ISCD – PDC 2015 TBS is associated with vertebral, hip and major osteoporotic fracture risk
in older women (hip and major osteoporotic fracture risk in older men)
TBS should not be used alone to determine treatment TBS can be used in association with FRAX and BMD to adjust FRAX-
probability in older women and men
TBS is not useful for monitoring bisphosphonate TBS is associated with major osteoporotic fracture risk in postmenopausal women with type II diabetes
Shepherd et al. JCD 2015
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Hip Geometry
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Hip Strength Analysis / Advanced Hip Analysis
θ
Beck et al. 1990
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Bone Distribution 74 year old physically active lady
83 year old physically inactive lady
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Faster & Stronger
Slower & Weaker
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Hip Geometry: Independent of FRAX and BMD Manitoba database, N=50,420 women >40, 1020 incident
hip fractures HR per SDFRAX without BMD
HR per SDFRAX with BMD
CSA 1.79(1.66-1.94)
1.11(1.01-1.22)
Section Modulus 1.47(1.36-1.58)
1.04(0.97-1.12)
Buckling Ratio 1.21(1.15-1.26)
1.21(1.14-1.28)
CSMI 1.25(1.16-1.35)
1.05(0.98)
Neck Shaft Angle 1.23(1.17-1.30)
1.23(1.17-1.30)
Hip Axis Length 1.30(1.22-1.38)
1.30(1.22-1.38)
Leslie WD et al. 2015 JCEM
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Hip Axis Length
67 year old woman T-scores: Total hip -1.6 FRAX: Major 11% Hip 2.7%
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HAL predicts hip fracture independent of FRAX and BMD
Leslie WD et al. JCD 2015
3.7%
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Precision of Hip Geometry Parameters
Precision % CV %LSCCSA 1.9 to 7.9 5.3 to 21.9Section Modulus 3.3 to 10.1 9.1 to 28.0Buckling Ratio 2.8 to 30.6 7.8 to 84.8CSMI 3.2 to 11.7 8.9 to 32.4Neck Shaft Angle 0.6 to 2.7 1.7 to 7.5Hip Axis Length 0.4 to 1.8 1.2 to 5.0
Leslie 2015 ISCD
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ISCD – PDC 2015
Hip axis length (HAL) derived from DXA is associated with hip fracture risk in postmenopausal women.
Other hip geometry parameters derived from DXA should not be used to assess hip fracture risk.
Hip geometry parameters derived from DXA should not be used to initiate treatment.
Hip geometry parameters derived from DXA should not be used for monitoring.
Shepherd et al. JCD 2015
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Atypical Femoral Fractures
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Atypical Femoral Fractures Located in the sub trochanteric region and the diaphysis of
the femur Reported in patients in bisphosphonates or denosumad
treatment for osteoporosis But do occur in patients NOT taking these drugs Absolute risk of AFF in patients on bisphophonates is low
ranging from 3.2 to 50 per 100,000 person-years Long-term use of bisphosphonates may be associated with
higher risk approxiamtely 100 per 100,000 person-years First reported in 2005 (Odvina et al. JCEM)
Shane et al. JBMR 2014
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ASBMR Task Force 2013 -Revised Case Definition of AFFs
The fracture must be located along the femoral diaphysis from just distal to the lesser trochanter to just proximal to the supracondylar flare.
In addition, at least four of five Major Features must be present. None of the Minor Features is required but have sometimes been associated with these fractures.
Major features1. The fracture is associated with minimal or no trauma, as in a fall from a standing height or less
2. The fracture line originates at the lateral cortex and is substantially transverse in its orientation, although it may become oblique as it progresses medially across the femur
3. Complete fractures extend through both cortices and may be associated with a medial spike; incomplete fractures involve only the lateral cortex
4. The fracture is noncomminuted or minimally comminuted
5. Localized periosteal or endosteal thickening of the lateral cortex is present at the fracture site (“beaking” or “flaring”)
Minor features1. Generalized increase in cortical thickness of the femoral diaphyses
2. Unilateral or bilateral prodromal symptoms such as dull or aching pain in the groin or thigh
3. Bilateral incomplete or complete femoral diaphysis fractures
4. Delayed fracture healing
Shane et al. JBMR 2014
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ASBMR Task Force 2013 -Revised Case Definition of AFFs
The fracture must be located along the femoral diaphysis from just distal to the lesser trochanter to just proximal to the supracondylar flare.
In addition, at least four of five Major Features must be present. None of the Minor Features is required but have sometimes been associated with these fractures.
Major features1. The fracture is associated with minimal or no trauma, as in a fall from a standing height or less
2. The fracture line originates at the lateral cortex and is substantially transverse in its orientation, although it may become oblique as it progresses medially across the femur
3. Complete fractures extend through both cortices and may be associated with a medial spike; incomplete fractures involve only the lateral cortex
4. The fracture is noncomminuted or minimally comminuted
5. Localized periosteal or endosteal thickening of the lateral cortex is present at the fracture site (“beaking” or “flaring”)
Minor features
1. Generalized increase in cortical thickness of the femoral diaphyses2. Unilateral or bilateral prodromal symptoms such as dull or aching pain in the groin or thigh
3. Bilateral incomplete or complete femoral diaphysis fractures
4. Delayed fracture healingShane et al. JBMR 2014
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Example of Atypical Femoral fracture
Shane et al. JBMR 2014
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Bone Density and AFF
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Whole Femur Imaging with DXA
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Beaking – Quantification with DXA
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