Table 2.

Eight-item core outcome set for chronic post-surgical pain after total knee replacement

Core outcome	Pain features within core outcomea
Pain intensity	Average pain intensity
	Worst pain intensity
	Whether pain is controllable
Pain interference with daily living	Whether pain interferes with work or housework
	Whether pain interferes with valued everyday activities
	Whether pain interferes with valued social, family or leisure activities
	Whether pain interferes with walking
	Whether pain interferes with quality of life
	Whether pain interferes with rest or sleep
Pain and physical functioning	Pain with general activity
	Pain when walking
	Pain when kneeling
	Pain when climbing stairs
	Pain when descending stairs
	Whether pain is disabling
Temporal aspects of pain (time and pain)	Frequency of pain
	Duration of pain since the operation
	Night pain
	Constant pain
Pain description	Pain location
	Pain quality (e.g., sharp, aching, throbbing)
Emotional aspects of pain	Whether pain is unbearable
	Pain self-efficacy
	Ability to cope with pain
	Kinesiophobia
Use of pain medications	Frequency of pain medication use
	Reduced need for pain medications
	Type of pain medication taken
	Dose of pain medication taken
Improvement and satisfaction with pain relief	Whether expectations of pain relief have been met
	How pain compares to preoperative pain
	Whether pain has improved since the operation
	Satisfaction with pain relief from the operation

^aThe pain features are included in this table to demonstrate how the 8-item core outcome set was developed from the 33 pain features.