Management of Postmenopausal Osteoporosis
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Management of Postmenopausal Osteoporosis
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? Our comprehensive searchFurtherManagementofPostmenopausalOsteoporosisPanagiotaAndreopoulou1andRichardS.Bockman1,2DepartmentofMedicine,EndocrineService,HospitalforSpecialSurgery,NewYork,NY,
10021;email:andreopouloup@hss.edu
21
Annu. Rev. Med. 2015.66:329-342. Downloaded from http://wendang.chazidian.com Access provided by Lanzhou University on 02/04/15. For personal use only.
内容需要下载文档才能查看 内容需要下载文档才能查看 内容需要下载文档才能查看 内容需要下载文档才能查看WeillCornellMedicalCollege,NewYork,NY,10065;email:bockmanr@hss.eduAnnu.Rev.Med.2015.66:329–42FirstpublishedonlineasaReviewinAdvanceonOctober29,http://wendang.chazidian.com
Thisarticle’sdoi:
10.1146/annurev-med-070313-022841
c2015byAnnualReviews.Copyright??
AllrightsreservedKeywordsbonemicroarchitecture,fracturerisk,combinationtherapyAbstractAhallmarkofmenopause,whichfollowsthedeclineintheovarianpro-ductionofestrogen,istheaggressiveandpersistentlossofbonemineralandstructuralelementsleadingtolossofbonestrengthandincreasedfrac-turerisk.Thisreviewfocusesonnewermethodsofdiagnosingosteoporosis
andassessingfracturerisk,aswellasonnovelmanagementstrategiesforpreventionandtreatment.Fracture-riskpredictionhasbeensigni?cantlyenhancedbythedevelopmentofmethodssuchasthetrabecularbonescore,whichhelpsassessbonemicroarchitectureandaddsvaluetostandardbonedensitometry,andtheFractureRiskAssessmentTool(FRAX)algorithmtechniques.Thetreatmentofosteoporosis,whichhasthegoalsoffracturepreventionandriskreduction,ismovingbeyondtraditionalmonotherapieswithantiresorptivesandanabolicagentsintonewcombinationregimens.
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INTRODUCTIONGeneticallydeterminedlowbonemassalongwiththelossofboneassociatedwithestrogende-?ciencyprobablyaccountforthemajorityofpatientswithpostmenopausalosteoporosis.Never-theless,allpostmenopausalpatientswithosteoporosisshouldbeevaluatedforsecondarycausesofboneloss,suchaslong-term(morethanthreemonths)administrationofsystemicglucocorticoids,includinghighdosesofinhaledsteroidsandendogenoushypercortisolism;rheumatoidarthri-tis;chronicliverdisease;alcoholism;untreatedhypogonadismfollowingbilateraloophorectomy;anorexianervosaorothersevereeatingdisorders;administrationofchemotherapyoraromataseinhibitors;hypopituitarism;prolongedimmobilityassociatedwithspinalcordinjury,Parkinson’sdisease,stroke,musculardystrophyorankylosingspondylitis;immunosuppressioninorgantrans-plantationpatients;diabetesmellitustype1ortype2;untreatedhyperthyroidismandoverre-placementinhypothyroidism;in?ammatoryboweldisease;andchronicobstructivepulmonarydisease.However,thisreviewfocusesonnewerissuesinpostmenopausalosteoporosisthatarenotattributabletosecondaryconditions.IDENTIFYINGPATIENTSATRISKBonemineraldensity(BMD)isanassessmentofthemineralcontentinkeyskeletalregions.TheWorldHealthOrganization(WHO)hasde?nedosteoporosisusingaBMDscorederivedfromdual-energyX-rayabsorptiometry(DXA),thatis,2.5(T-score)standarddeviationsbelowthemeanforhealthyyoungadultsatthespine,femoralneckortotalhip(1).T-scoresbetween?1.0and?2.5areconsistentwithlowbonemass,andthoseabove?1.0areconsiderednormal.Acon-sensusreportbytheUSNationalInstitutesofHealthemphasizedthestructuralbasisbyde?ningosteoporosisas“askeletaldisordercharacterizedbycompromisedbonestrengthpredisposingtoincreasedriskoffracture”(2).Hence,surrogatemeasurementsofbonestrengthhaveprovenextremelyhelpfulinbetterassessingfracturerisk.DualX-RayAbsorptiometryCentralDXAisusedformeasurementofBMDofthespineandhip.Ithasprovenutilityforthediagnosisofosteoporosis,assessmentoffracturerisk,andmonitoringofresponsetotreatment.Thismethodiswidelyavailablewithreadilyinterpretableresults(3,4).TheriskoffractureexponentiallyincreasesasBMDdecreasesatthespine,hip,forearm,humerus,andpelvis(3).NearlyallrandomizedclinicaltrialshaveutilizedBMDchangesasasurrogateendpointforassessingtheef?cacyofagentsusedforosteoporosispreventionandtreatment(5).Additionally,
DXAmayincludeanassessmentoflowerthoracicandlumbar(T4–L4)vertebralfracture(6).ArealBMDmeasurements,however,areaffectedbybonesizeandshape,softtissuecom-position,severedegenerativediscdisease,vertebralfractures,priorspinalsurgery,bilateralhipreplacement,andobesity.Mostimportantly,itisnotpossibletodifferentiatebetweenundermin-eralizedbone(osteomalacia)andosteoporosis.
PeripheralDXAmeasurementsoftheBMDoftheforearm,heelorhandcorrelatelesswellwithcentralDXAmeasurements(7),andtheyhavelittleutilityasserialmeasurementstoassesstreatmentef?cacy.
FractureRiskAssessmentTool
TheWHO’sFractureRiskAssessmentTool(FRAX)isafractureriskpredictionmodelthatutilizesthefemoralneckBMDasmeasuredbyDXAandincorporatesclinicalriskfactorsforboneloss330Andreopoulou·BockmanAnnu. Rev. Med. 2015.66:329-342. Downloaded from http://wendang.chazidian.com
inordertobetterestimatethe10-yearprobabilityofhipandothermajorosteoporoticfractures(spine,humerus,forearm).Theclinicalriskfactorsincludethecountryorgeographicregionandthepatient’sethnicorigin,age,sex,weight,height,priorfragilityfracture,parentalhistoryofhipfracture,currentsmoking,excessalcoholintake,long-termuseoforalglucocorticoids,rheumatoidarthritis,andsecondaryosteoporosis(8).TheFRAXalgorithmwasbasedondataderivedfrompopulationcohortsinEurope,NorthAmerica,Asia,andAustralia(9–11).FRAXisbecomingpartofstandardDXAreportsandmaybeaccessedonlineathttps://www.shef.ac.uk/FRAX/.FRAXmodelsareavailablefor52countries,andthereareadditionalethnic-speci?cmodelsfortheUnitedStates,becausefractureprobabilityvariessigni?cantlyamongdifferentregionsandethnicgroups(12).
IntheUnitedStates,theNationalOsteoporosisFoundationrecommendstreatmentofpa-tientswithaFRAX-calculated10-yearfractureprobabilityof>3%forhipfractureand>20%formajorosteoporoticfracture.FRAX,however,hasnotbeenevaluatedinpatientswhohavealreadyreceivedtreatment(13).Itisimpossibletoincorporateeverypossibleclinicalscenario.
ly
nintotheFRAXalgorithm,suchasthenumberorsitesofpriorfractures,thedoseandduration
o
eofglucocorticoids,oruseoftobaccoandalcohol.Currently,onlythefemoralneckBMDcanbe
s
u
l
aenteredintotheFRAXalgorithmdespitethefrequentdiscordancebetweenBMDofthehipandn
o
sspine,althoughcorrectivecalculationshavebeenproposed(14).Finally,DXAandFRAXdonot
r
e
ptakeintoaccountinformationonthemicrostructuralintegrityofbone.
r
Fo
.
5
1AssessmentsofBoneMicroarchitecture
/4
/
2AlthoughdiagnosisandtreatmentdecisionsoftenrelyonDXAmeasurements(4),whenoneclosely
n
oreviewsfractureincidence,themajorityoflow-traumafracturesoccurinindividualswithlowor
y
t
inormalbonedensitymeasurements(15).Therefore,assessmentofothermajordeterminantsof
s
r
evbonestrength—suchastrabecularstructure,corticalthickness,focaldefects,materialproperties,
i
n
Uandgeometry,aswellaspersonalclinicalandfamilyhistoryandpropensityforfalls—mustbe
u
oconsideredforamorecompleteriskassessment.
h
z
n
aExtensiveprogresshasbeenmadeinassessingmicrostructureandbonestrengthutilizinghigh-
L
yresolutionperipheralquantitativecomputedtomography(QCT)(16),advancedCTimaging(17),
b
dandhigh-?eldmagneticresonanceimaging(MRI)(18).DetailedplainCTanalysesofthefemoral
e
id
vneck,forexample,haverevealedfocalsitesofcorticalthinningwithamuchhigherfrequency
o
r
pinpatientswithpriorhipfractures(16,19).Utilizationofgeometricpropertiesderivedfrom
s
s
eDXA(20)coupledwithcomputationalmodeling(21)provideincreasedunderstandingoffracture
cc
Asusceptibility.Unfortunately,theuseofthesemethodsislimitedtocenterswithwell-established
expertiseintheparticulartechnique.
TrabecularBoneScore
NewlydevelopedadvancesinDXAmethodshavegreatlyexpandedtheirfunctionality(22).Newsoftware(TBSiNsight??R,MedimapsGroup,Plan-les-Ouates,Switzerland)enablesestimationoftrabecularbonetexture,whichcanbecorrelatedtobonemicroarchitecture(23).Arelationshipbetween3Dbonecharacteristics,mechanicalparameters,andthetrabecularbonescore(TBS)hasbeenestablished(23,24).
ManystudieshavedemonstratedthatTBSpredictscurrentandfuturefragilityfracturesinosteoporosisbeyondthosepredictedbyBMDandclinicalriskfactorsandhasvalueinmonitoringresponsetotreatment(25).TBSmayhaveadditionalvalueinsecondaryosteoporosiswhenabnor-maltrabecularmicroarchitecturemayhelpexplaintheparadoxofincreasedfracturesatahigherBMDinspeci?cdiseasesorconditions(e.g.,diabetes,rheumatoidarthritis,glucocorticoid-induced
http://wendang.chazidian.com?ManagementofPostmenopausalOsteoporosis331Annu. Rev. Med. 2015.66:329-342. Downloaded from http://wendang.chazidian.com
Table1Proposedtrabecularbonescore(TBS)rangesforpostmenopausalwomen(28)TBS
<1.2
1.2–1.35
>1.35MicroarchitectureDegraded=higherriskoffracturePartiallydegraded=mediumriskoffractureNormal=lowerriskoffracture
Annu. Rev. Med. 2015.66:329-342. Downloaded from http://wendang.chazidian.com Access provided by Lanzhou University on 02/04/15. For personal use only.osteoporosis).TheprecisionerrorforTBSisequivalenttoarealBMD(26,27).Onewayofin-terpretingTBSwouldbetoprovideclinicallyrelevantranges(28)(Table1).BecauseTBSdataaregeneratedautomaticallyintheregularDXAscanofthelumbarspine,hugedatabasesareavailableforanalysis(25).Asummaryof?ndingsfromclinicalstudiesisgiveninTable2(26,27,29–36).DegenerativediscdiseaseandperiarticularspinaldiseasehavelittleeffectonTBS,incontrasttotheirimpactonbonedensitymeasurements(37).BMDhasshownapositivecorrelationwithbodymassindex(BMI)(38).Bycontrast,TBShasshownanegativebutmildcorrelationwithBMI.BothBMDandTBSpredictfractureriskbutareconsistentlyfoundtobeindependentpredictors(38),andbothshowastrongpositiveassociationwithmanyriskfactorsthatcanpredictosteoporoticfracturerisk.Furthermore,TBSsigni?cantlyenhancestheabilityofFRAXtoclassifyfracturerisk(9,39).TheWHOisconsideringpossibleinclusionofTBSintheFRAXcalculation.TherearelimitstoTBS.OlderdensitometerscanimpairthequalityofthevariogramandmaynotbecompatiblewithTBSsoftware.Theeffectofabdominalsofttissueinattenuatingphotonabsorptionhasnotbeenfullyelucidated,andBMIhasnotprovenhelpfulincorrectingforartifactsduetobodytypeorcomposition.Appropriatephantommeasurementstoenableinter-andintrascancalibrationhavebeenusedbythemanufacturerwheninstallingthesoftware.ThecurrentTBSalgorithmisusedonlyinwomen;however,aninternationalprospectivemeta-analysisisunderwaythatshouldprovideriskthresholdsforbothsexesandfordifferentethnicities.Nevertheless,theeasyavailabilityoftoolstoassessbonemicroarchitecturehasenormouspotentialtoidentifyskeletaldeteriorationandfragilityasthesetoolsareintegratedintophysicians’work?owwithoutconsumingextratime.INTERVENTIONALSTRATEGIESAstrategicapproachtopostmenopausalosteoporosiswouldembraceearlydetectionandstagedinterventions.Bonemassislargelygeneticallydetermined.Morethanone-thirdofwomenreach
Table2Clinicalstudiesusingthetrabecularbonescore(TBS)Goal
Fractureriskassessment
FractureriskassessmentStudytypeRetrospectiveProspectiveOutcomeLowTBSassociatedwith?2×greaterriskinwomenandmen1SDdeclineinTBSassociatedwith35%increaseinfracturerisk
afteradjustmentforspineBMDandclinicalriskfactors
TBSbetterpredictorthanBMD
LowerTBSinpatientswithfractures
ChangeinTBS<BMD
TBSandBMDchangesnotcorrelated
NocorrelationbetweenchangesinTBSandBMD,bothslightly
increasedReferences29–3326,27,34Treatmentresponse:antiresorptivesTreatmentresponse:teriparatideProspectiveProspective3536
Abbreviations:BMD,bonemineraldensity;SD,standarddeviation.
332Andreopoulou·Bockman
menopausewithlowbonedensity,whichisfrequentlyworsenedbyyearsofinadequatecalciumand/orvitaminDintake.Thiscanleadtoregionsofundermineralizedboneandlossofstruc-turalelements,resultinginincreasedskeletalfragilitythatisoftenundetectedbybonedensitymeasurementsalone.
Therefore,astartingpointforproperriskassessmentincludesadetailedmedical,activity,andnutritionalhistory.BonedensitymeasurementbyDXAprovidesanexcellentsurrogatemeasureoffracturerisk.Inaddition,anappreciationofthegeometryofthebonesfromtheDXAprintoutscanbeinformative.Anarrowfemoralneckorradialshaftresultinginalowmomentofinertiacanbeapredictoroflowbonestrength.AssessingtrabecularbonestructurebycalculatingTBSmayprovideinsightsintothestructuralintegrity.
Startingearlytopreventosteoporosismeansensuringadequatecalcium,vitaminD,andex-erciseduringtheformativeyearstobuildbonemasstoitsgeneticallyprogrammedideallevel.De?cienciesincalciumandvitaminDintakeduringtheperimenopausalyearscanacceleratetherateofboneloss,ascandietshighinphosphateoracidcontent.Therefore,initiatingand.
ly
nmaintainingahealthyboneprogramasearlyaspossibleisonestartingpoint.
o
e
s
u
l
aCalciumn
o
s
r
eBoneisalivinganddynamictissue,whichallowsforcontinuedgrowthandremodelingthroughout
p
rlife.Thousandsofmilligramsofcalciumpassivelydiffuseintoandoutofbonedailyandare
Fo
.
5bioactivelymovedintoandoutofthebonematrixduringcell-mediatedboneremodeling.As
1
/4muchas10,000mgofcalciumare?lteredbythekidneysdaily,andmorethan98%ofthatis
/
2reabsorbed.Minorincrementsintherenal?lteredloadoveraprolongedperiodoftimecanlead
n
otochronicde?citsincalciumbalance.Inadequatedietarycalciumcanresultinacompensatory
y
t
ilossofcalciumfrombone—anegativespending—thatcanhavedetrimentalconsequencesfor
s
r
evskeletalintegrity.Duringnormalbonehomeostasis,thereareobligatorylossesofcalciumbythe
i
n
Ukidneys,gastrointestinaltract,andskin;replenishmentviadietaryintakeisnecessarytomaintain
u
oapositivecalciumbalance.Beyondcalciumhomeostasis,severalstudiessuggestadditionalbone
h
z
n
abene?tsfromcalciumsupplementation.
L
yEvidencethatcalciumsupplementationreducesfractureincidencewouldbethemostconvinc-
b
dingproofofskeletalbene?t.Posthocanalyseshaveshownapositiveeffectofcalciumsupple-
e
id
vmentationonfracturesincompliantpatients;however,intent-to-treatanalyseshavenotshownan
o
r
peffect.Inameta-analysisof17trialswith52,625participants,therewasa12%riskreduction.In
s
s
ethesubgroupthathadcalciumsupplementationalone,ananalysisofonly6,517participants,the
cc
Areductioninfractureriskwasevengreater(24%)whencompliancewashigh(greaterthan80%)
andwhencalciumsupplementationwasequaltoorgreaterthan1,200mgperday(40).
Recently,controversyhasragedovertheincidenceofmyocardialinfarctioninpatientsre-ceivingcalciumsupplements.Randomizedcontrolledtrialsandmeta-analyseshavenotresolvedthecontroversy(41–43),andthedisagreementpersists(44).In2013,astudyinpatientswithosteoporosiswhowerefollowedfor10yearsreportedthatcalciumsupplements,upto1,000mgperday,alongwithincreaseddietaryintakeofcalciummaybeassociatedwithareducedriskofmortalityinwomen(45).
VitaminD
Basedondatafromrandomizedplacebo-controlledclinicaltrialsevaluatingfallsandfractures,theUSInstituteofMedicinerecentlyrecommendedthatacirculatinglevelof25-hydroxyvitaminD(25OHD)at20ng/mlissuf?cientfor97.5%ofthepopulation,althoughupto50ng/mLissafe
(46).Adultsupto70yearsoldneed600IUvitaminDdailytomeetthegoalof20ng25OHD,
http://wendang.chazidian.com?ManagementofPostmenopausalOsteoporosis333Annu. Rev. Med. 2015.66:329-342. Downloaded from http://wendang.chazidian.com
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