The pain often feels worst when running downhill or walking down stairs, and the knee is often stiff and sore after sitting down for long periods.

在下山跑或下楼梯的时候疼痛加剧，长时间坐了之后膝盖会感到僵硬和疼痛。

youdao

The pain often feels worst when running downhill or walking down stairs, and the knee is often stiff and sore after sitting down for long periods.

在下山跑或下楼梯的时候疼痛加剧，长时间坐了之后膝盖会感到僵硬和疼痛。

youdao