PROBLEM TO BE SOLVED: To provide an arthritis therapeutic method capable of expecting a pain relief effect in a short period, and to provide an arthritis therapeutic system.SOLUTION: An arthritis therapeutic method includes: an instrument introduction step S11 for allowing at least one instrument 120 having a tube shape to communicate with a lesion 1 where crystal-induced arthritis is caused and a therapeutic step S12 for removing a causative substance of the crystal-induced arthritis from the lesion by perfusion and discharge of cleaning fluid passing through the instrument.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】短期間での除痛効果を期待できる関節炎治療方法および関節炎治療システムを提供する。【解決手段】関節炎治療方法は、結晶誘発性関節炎が生じた病変部位1に、管形状を有する少なくとも1つの器具120を連通させる器具導入ステップS11と、結晶誘発性関節炎の原因物質を、前記器具を通じた洗浄液の灌流および排出によって、病変部位から除去する治療ステップS12と、を有する。【選択図】図2