The degree of joint pain was judged by a visual analogue scale (VAS) and were divided into mild, moderate and severe pain group according to their VAS score.

• 利用vas进行疼痛程度的判定 ,将疼痛分为轻、中、重度疼痛 3组 ,评价双板区信号强度与疼痛及疼痛程度的关系。