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Table 1 Hideo Watanabe’s knee scoring system-related pain score

From: Levels of neuropeptide Y in synovial fluid relate to pain in patients with knee osteoarthritis

Group Standard
No pain group Occasionally feeling fatigue or heaviness, but no pain at any time
Mild pain group Pain at starting time of various activities or occasionally during long-distance walking, but no pain at rest
Moderate pain group Pain usually on walking, but pain gradually subside after a brief rest
Strong pain group Persistent pain on walking, but pain gradually mitigates after a rest, usually associate with spontaneous pain
Severe pain group Persistent pain at any time, including walking and rest