Table 1.

Summary of measures used to assess function pre-operatively and at 3-months and 12-months post-operatively

	ICF domains assessed			Mode of completion	Scoring
	I	A	P
Patient-reported outcome measures*
WOMAC function subscale		++	+/−	Patient	0-68
Ab-IAP	++	++	++	Patient	I scale = 9–45, A scale= 17–85, P scale = 9-45
SF-12 Physical Component Score	+/−	++	+/−	Patient	0-100
MYMOP2†	+/−	+/−	+/−	Patient with assistance from research nurse	0-6
Clinician-administered measures#
American Knee Society Score	+	++	-	Research nurse and patient	0-100
Harris Hip Score	+	++	+/−	Research nurse and patient	0-100
Performance tests and motion analysis#
Timed 20-metre walk	-	++	-	Research nurse and patient	Time, difficulty, motion parameters
Timed Get up and go test	-	++	-	Research nurse and patient	Time, difficulty, motion parameters
Sit to stand to sit	-	++	-	Research nurse and patient	Completion, difficulty, motion parameters
Step tests	-	++	-	Research nurse and patient	Completion, difficulty, motion parameters
Single stance balance tests	-	++	-	Research nurse and patient	Completion, difficulty, motion parameters

ICF= International Classification of Functioning, Disability and Health, I=Impairments, A=Activity limitations, P=Participation restrictions.

The extent to which I, A and P is assessed within each tool is indicated using the following symbol system: - no items assessing domain, −/+ a small number of items assessing domain, + some items assessing domain, ++ the majority of items assessing domain.

*Scores are self-completed by the patient in a postal questionnaire, excepting MYMOP2 which is completed during a research appointment.

^†The MYMOP2 asks patients to generate two symptoms (impairments or activity limitations) and one activity (which could be activity limitation or participation restrictions) that is restricted by their symptoms.

^#Scores and tests are assessed by a research nurse during a research appointment. The patients are also invited to rate their performance on the functional tests.