articular manifestations (1) morning stiffness(晨僵) O stiffness persisting for over 60 minutes is prominent in the morning or during rest and subsides after daytime activity a The persisting length of morning stiffness is associated with the degree of articular inflammationarticular manifestations （1）morning stiffness（晨僵）  stiffness persisting for over 60 minutes is prominent in the morning or during rest and subsides after daytime activity  The persisting length of morning stiffness is associated with the degree of articular inflammation