Articulatory antrum accumulates blood to often also be one of this ill features, reach gambrel with genu the commonnest, acute period joint is swollen, painful, hot, constant but by accident examine is acute arthritis.

• 关节腔积血亦常为本病特征之一，以膝及踝关节最常见，急性期关节肿、痛、热，常可误诊为急性关节炎。