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Effects of Bisphosphonates and PTH on Fracture Healing and Spine Fusion “Subtrochanteric Fractures”
Joseph M. Lane, MD
Hospital for Special SurgeryNEW YORK
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
Joseph M. Lane, MD
Does have a financial interest or relationship
with the manufacturers of products or
services:– Consulting Fees: Amgen, Arthrocare, Biomimetics, D’Fine, Innovative Clinical
Solutions, Kuros Biosurgery AG, Osteotech, Orthovita, Soteira, Zelos, Zimmer
– Speakers’ Bureaus: Eli Lilly, Novartis, Orthovita, Proctor and Gamble, Roche, Sonofi - Aventis
Presentation will not include discussion of off
label or investigational use of products or
treatments
andBoneBoneQualityQualityBoneBone
QualityQuality BoneBone
StrengthStrength BoneBone
StrengthStrength
Architecture/GeometryBone RemodelingDamage AccumulationMineralization of Matrix
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
BoneBoneMineralMineralDensityDensity
BoneBoneMineralMineralDensityDensity
NIH Consensus Statement 20001
The Goal: Increased Bone Strength
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
Risk of Vertebral Fracture
5x greater with prior vertebral fracture
Vertebral fracture2x risk of hip fracture
Fracture more fractures
(Nevitt 1999)
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
Metabolic Bone DiseaseWorkup For Osteopenia
Bone Marrow CBC
Sed Rate
Immunoelectro-Phoresis
Endocrinopathy Hyper Thyroid, Hyper PTH, Cushings, Juvenile Diabetes
Osteomalacia- Calcium, Phos, Alk-Ptase, PTH
25 Hydroxy Vit D
Osteoporosis – High vs. Low
Turnover NTX
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
Agents Against Osteoporosis
Antiresorption
(Experimental)
Estrogen Calcitonin
Bisphosphonates
Serms
Bone Stimulation
PTH
Strontium Renalate
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
Bisphosphonates
Bone Mass (Spine/Hip)
Fracture Risk (Vertebra/Long Bones)
= Fracture Healing (animal/patients)
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
Animal Studies
Remodeling
Healing
Callus
=Biomechanics
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
Clinical Trials – Bisphosphonates Clinical Trials – Bisphosphonates in Fracture Healingin Fracture Healing
Colles’ Fracture (Alendronate)
Tibia Shaft/Ankle (Alendronate)
Hip fractures (Zoledronic Acid)
↑ Bone Mass (DXA)
No Difference in Clinical Union
↓ Secondary Fracture
↓ Mortality (Van der Poest JBMR 200, 2002)
(Lyles NEJM 2007)
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
PTH (1-34) Anabolic Agent
Bone mass
All fractures
Enhances fracture healing
Spine fusion
In animal studies
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
Intermittent PTH (1-34)Rat Femoral Fracture
Bone Mineral Content
Bone Mineral Density
Bone Mineral Strength
Sustained Anabolic Effect
Large Cartilaginous Callus
No Chondrocyte Differentiation Delay
Alkhary
Einhorn JBJS 2005
Nakazawa - Bone 2005
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
Fracture Healing: PTH vs. Bisphosphonates
Bisphosphonate PTH
Callus Size
Maturation
Biomechanics =
Animal
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
Alendronate
Long term effect unkown
Theoretically dose with time
Keep collagen breakdown products low
Subtrochanteric Fracture
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
Prolonged Bisphosphonates
Turnover
Microfracture
Frozen Bone
Brittle Fracture
(PAK)
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
Background
Animal studies have linked bisphosphonate use to microdamage accumulation
Case series have identified atypical fractures
– Odvina et al J Clin Endocrinol Metab 2005;90:1294
– Goh et al JBJS Br 2007;89:349 – Kwek et al Injury 2008;39:224
–Neviaser, et al J Orthop Trauma (2008)
1. NIH Consensus Development Panel on Osteoporosis 2000. JAMA. 2001;285:785-795.
Methods
Retrospective case-control study 2000-2007• Cases: postmenopausal women with
subtrochanteric/shaft (ST/S) fractures – Low energy mechanism
• Controls: postmenopausal women with intertrochanteric (IT) or femoral neck (FN) fractures
• Matched by age, race and BMI
X-ray confirmation of fracture type
Exclusion of any identifiable secondary causes of bone loss
Rate of Alendronate Use
Subtrochanteric/Shaft Fracture Cases (n=41)
Hip Fracture Controls (n=82) P Value
Alendronate Use (%) 15 (36.6) 9 (11) .001
• Subtrochanteric/Shaft– 2 patients on 10 mg alendronate daily– Remaining 13 on 70 mg every week
• Hip Fracture Controls– 2 patients on 35 mg alendronate every week– 1 took etidronate for 5 years then 70 mg alendronate for 2 years– 1 patient was on 35 mg risedronate every week and was included in this
group– Remaining 5 on alendronate 70 mg every week
• OR 4.68, 95% CI (1.83-11.89)
Simple With Thick Cortices Fracture
83 year old female with a 9 year history of alendronate use
77 year old female with a 5 year history of alendronate use
ST/S Fracture
83 year old female with no history of alendronate use
60 year old female with no history of alendronate use
24
Not for duplication
6
Not for duplication
20
Not for duplication
31
Not for duplication
2
Not for duplication
Bis-24
Not for duplication
Bis-6
Not for duplication
No Bis-20
Not for duplication
Bis-31
Not for duplication
No Bis-2
Not for duplication
Simple With Thick Cortices Fracture
ST/S on Alendronate
(n=15)
ST/S Not on Alendronate
(n=26)P
Value
X-ray Pattern (%) 10 (66.6) 3 (11.5) <.001
• X-ray Pattern Definition: simple transverse or oblique with cortical thickening and beaking of the cortex on one side
• OR 15.33, 95% CI (3.06-76.90)
Pattern vs. Absence of Pattern
ST/S on Alendronate With
Xray Pattern (n=10)
ST/S on Alendronate Without Xray Pattern
(n=5) P Value
Age, y
Mean (SD) 70.4 (10.6) 82.5 (9.3) .05
Range 55-83 71-96
Race
White %, Asian % 90, 10 100, 0
BMI (SD), kg/m2 25.0 (4.1) 23.4 (3.8) .48
History of Osteoporosis, % 100 100 .99
Duration of time on alendronate (SD), y 7.3 (1.8) 2.8 (1.3) <.001
Ratio of cortical thickness to diameter 0.36 (0.048) 0.20 (0.034) <.001
Distribution by Fracture Type
• Kruskal Wallis one-way variance analysis on the duration of alendronate use in patients in all three groups yielded P=0.001
• Subtroch/shaft vs. Intertroch P=0.01
• Subtroch/shaft vs. Fem Neck P=0.001
• Fem Neck vs. Intertroch P=0.3
*1 pt on risedronate, **1 pt on etidronate for 5 years, then alendronate for 2
0
1
2
3
4
5
6
7
1-3 4-6 >6
Duration of bisphosphonate use (yrs)
Nu
mb
er o
f p
atie
nts
SubtrochantericIntertrochantericFemoral Neck
*
**
Conclusions
Long-term bisphosphonate use decreases risk of hipfractures at IT/FN (94%) regions but may increase at ST/Sregions (6%)
A small subgroup of patients may be more susceptible tothe effects of prolonged therapy
Further studies are needed to confirm whether prolongeduse increases the risk of ST/S fractures and tocharacterize this subgroup of patients
Osteoporosis Treatment Comparison
Bone
Formation Remodeling
Normal Fx Healing ↑↑ ↑Bisphosphonates ↓ ↓↓PTH ↑↑ ↑
Question
Mechanism
Treatment
Stress fracture
3 months pain
Local ↑ diameter
Mechanism
Bisphosphonates given to normal diaphyseal
bone
increased microdamage
collagen aging >> fiber failure
>> loss of toughness >> low energy
spontaneous fracture
Working Hypothesis
Stop bisphosphonate
Correct Ca/VIT D
Consider PTH 1-34 (anabolic)
Treatment
Patient with thigh pain
History – bisphosphonate
X-Ray → MRI / bone scan
Old FxOld Fx New Fx
No Pain Pain
↓ ↓
Anabolic Anabolic
Consider nailing
To Prevent Abnormal Bone Consider a Bone Holiday
Osteoporosis New Fracture Treatment
Calcium (Citrate) [1,000 mg Ca]
Vitamin D3 [2 – 6,000 units/day]
Short half-life bisphosphonate/lower dose
PTH → bisphosponate
Bone turnover determines TX: right in themiddle
Fracture on Bisphosphonate
Rule out secondary cause
Stop bisphosphoate
Correct calcium/vitamin D
Consider PTH
Clinical Studies
Clinical characterization of fracture healing
Evaluation of bone quality
Histology - Doty
Micro-Ct - Mayer-Kuckuk
F-TIR - Boskey
HSS Osteoporosis Team
MD/PhDAdele Boskey
Richard BockmanEdward DicarloSteven DotySteve GoldringDean LorichLinda RussellRobert SchneiderDave Zackson
FELLOWSJaimo AhnPadhraig O’LaughlinPhilipp Mayer-KuckukAlana SerotaAasis Unnanuntana
STUDENTS/RESIDENTSCharles ChangLily BogunovichBrian GladnickFlo Edobor-Osula Brett LenartDennis MeridethAndy NeviaserBarbara Schreck
RN’S/NP’SJanet CurtinPatricia DonnellyDiana LapianoLisa Shindle