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一、概述二、发病机制三、临床表现四、诊断五、治疗六、关节镜手术的方法方法一：方法二：FIGURE2.(A)Arthroscopicfindingfromtheanterolateralportaloftherightkneeshowsthatthecapsularfold(C)wasresectedbybasketforceps(arrow)insertedfromtheposteromedialportal.(B)Arthroscopicfindingfromtheanterolateralportaloftherightkneeshowsayellowishcysticfluidthatgushesouttotheposteromedialcompartmentbycompressingtheposteromedialpartskinoftheballoonedcyst.(M,medialfemoralcondyle.)FIGURE3.Arthroscopicfindingoftheanterolateralportaloftherightkneeshowsanopening(curvedarrow).Theopeningisshownattheposteromedialsideofthemedialheadofthegastrocnemius(G)afterthecapsularfoldwascompletelyresectedwithashaver(straightarrow)andbasketforceps.(M,medialfemoralcondyle.)FIGURE4.(A)Schematiccross-sectionalimageofthekneewiththeopeningoftheconnection.Theimageshowsthelocationoftheposteromedialviewingportal(b).(P,poplitealcyst.)(B)Arthroscopicfindingfromtheposteromedialportaloftherightkneeshowsseptationandloosefragmentsoftheinsideofthepoplitealcyst.FIGURE5.(A)Schematiccross-sectionalimageofthekneewiththeopeningoftheconnection.Theimageshowsthelocationoftheposteromedialviewingportal(b)andtheposteromedialcysticportal(c).(P,poplitealcyst.)(B)Grossviewoftherightkneejointthatwaspositionedforarthroscopicsurgeryforapoplitealcyst.Thearthroscopewasinsertedthroughtheposteromedialportal,andamotorizedshaverwasintroducedfromtheposteromedialcysticportal.(C)Arthroscopicfindingfromtheposteromedialportaloftherightkneeshowsthatamotorizedshaver(S)wasinsertedtotheinsideofthepoplitealcystthroughtheposteromedialportal.Thecystwall(W)wasresectedwiththeshaver.FIGURE6.(A)ApreoperativeMRimage(axialview)showsahugepoplitealcystwithmultipleseptation.(B)Afollow-up(postoperative9months)MRimage(axialview)showsthatthepoplitealcysthasdisappeared.Patient（poplitealcyst）ArthroscopyTHANKYOU
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