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原文链接:http://www.medpagetoday.com/Rheumatology/Arthritis/42192
ErosiveHandOALinkedtoLipids
Erosiveosteoarthritis(OA)ofthehandisasevereformofrADIographichandOA,ratherthanadistinctclinicalentity,andmaybedrivenbythepresenceofmetabolicabnormalities,researchersreported.
ThepatternofjointinvolvementinerosiveOAwassimilartothatseeninseverenon-erosivedisease,particularlyforsymmetry,withanadjustedoddsratioof6.5(95%CI3-14.1)forinvolvementofthesamejointintheoppositehand,accordingtoMichelleMarshall,PhD,ofKeeleUniversityinStaffordshire,England,andcolleagues.
ButindividualswitherosivehandOAhadmorethantwicetheriskofmetabolicsyndrome(OR2.7,95%CI1-7.1)andmorethanfourtimestheriskofdyslipidemia(OR4.7,95%CI2.1-10.6)comparedwithpatientswhohadseverenon-erosiveOA,theresearchersreportedonlineinAnnalsoftheRheumaticDiseases.
ErosivehandOAdiffersfromnon-erosivediseaseinseveralways.Forinstance,theonsetofsymptomssuchasswelling,stiffness,andpaintendstobeabrupt,andradiographsreveal"gull-wing"or"saw-tooth"deformitiesandcollapseofthesubchondralbone.
Followingapparentwideningofthejointspace,remodelingoccurs,resultingintheappearanceoflargeosteophytesandanirregularsubchondralplate.
Andoverall,worseclinicalandradiographicoutcomes--alongwithsystemicriskfactors--havebeenreportedforerosiveOA.
ButthecauseandpathogenicprocessesassociatedwitherosiveOAhavenotbeenfullyestablished,andtheEuropeanLeagueAgainstRheumatismhassuggestedthaterosivediseasemaybeasubsetofgeneralizedhandOA.
TodeterminewhethererosivehandOAactuallyisaseparateentityorpartofacontinuumofseverityandtoidentifypotentialriskfactors,MarshallandcolleaguesrecruitedpatientsfromaclinicalassessmentstudyofhandOAandalsofromastudyofkneeOAtoprovidealarger,enrichedsample.
Allparticipantsreportedhandpainandstiffnessforatleast"afew"dayswithinthepastmonth.
X-raysofthehandswerescoredaccordingtotheKellgrenandLawrence(KL)system,andthepresenceoferosivechangeswasevaluatedaccordingtotheVerbruggen-Veysprogressionscale.
Atotalof1,167patientsand8,608handjointswereincludedintheanalysis.
OntheKLgradingscale,1,754jointsweregrades2orhigher,indicatingpossIBLeordefiniteosteophytesandnarrowingofthejointspace.
Moderate-to-severeKLscoresof3orhigherwerefoundin425joints,indicatingthepresenceofmultipleosteophytes,jointspacenarrowing,sclerosis,andpossiblebonedeformities.
Severescoresof4,withlargeosteophytes,markedjointspacenarrowing,severesclerosis,anddefinitebonedeformitieswerefoundin112joints.
Erosivediseasewasidentifiedin207jointsin80patients.
Theseconddistalinterphalangealjointwasmostoftenaffected,andsignificantassociationswerefoundfortheoverallrankedorderofinvolvedjointsinbotherosiveandnon-erosiveOA(r>0.95).
Aswithsymmetry,thepatternofinvolvementacrossthejointsofthesamehandandthesamefingerwassimilarforbotherosiveandnon-erosivedisease.
Patientswitherosiveandnon-erosivediseaseweresimilarinmanycharacteristics,includingage,sex,thepresenceofkneeOA,afamilyhistoryofarthritis,andbodymassindex.Themaindifferencewasinthepresenceofdyslipidemiaandmetabolicsyndrome.
Amongpatientswithnon-erosiveKL3,atotalof6.2%hadabnormallevelsofcholesterol,asdid8.8%ofthosewithnon-erosiveKL4.
Incontrast,21.2%ofthosewitherosivediseasehadlipidabnormalities.
AndforpatientswithKL3and4,ratesofmetabolicsyndromewere4.1%and2.9%,respectively,whiletheratewas11.2%forthosewitherosivedisease.
Thepatternsofinvolvementinthehandjointssuggestthatthereare"strongsimilarities"betweenerosiveOAandmoderate-to-severenon-erosiveOA,andmayrepresentanevolutionmediatedthroughmetabolicpathways,theresearchersexplained.
"Theexactmechanismisnotyetknownbutosteoarthritisisbelievedtosharesimilarbiochemicalandinflammatorypathwaystometabolicdisorders,anddyslipidemiamayalterlipidmetabolisminanumberofjointtissues,"theywrote.
Alimitationofthestudywastherelativelysmallnumberofpatientswitherosivedisease.

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