Table 5 Summary of measures to be taken

 Age, gender, weight, height, body mass index

X

 Duration of knee OA symptoms

X

 Educational level, postcode

X

 Treatment and medication use in past month

X

X

X

X

 Problems in other joints

X

 Co-morbidities

Functional Co-morbidity Index

X

 Physical activity level

Average daily step count via wrist-worn accelerometry

X

X

X

X

 OA knee symptoms in past 48 h

WOMAC Total score (includes pain, physical function, stiffness subscales)

X

X

X

X

 Average knee pain past week

11-point NRS

X

X

X

X

 Average knee pain during walking past week

11-point NRS

X

X

X

X

 Physical activity level

Daily minutes of sedentary, light, moderate, vigorous activity via wrist-worn accelerometry

X

X

X

X

 Knee pain past 48 h

WOMAC pain subscale

X

X

X

X

 Knee function past 48 h

WOMAC function subscale

X

X

X

X

 Depression past week

4-item PROMIS depression subscale

X

X

X

X

 Anxiety past week

4-item PROMIS anxiety subscale

X

X

X

X

 Stress past month

4-item PSS

X

X

X

X

 Fear of movement

Brief FOM questionnaire

X

X

X

X

 Pain catastrophising

PCS

X

X

X

X

 Health related quality of life

EQ-5D-5L

X

X

X

X

 Knee perception

FREKAQ

X

X

X

X

 Global rating of change

7 point ordinal scale

X

X

X

 OA/activity Conceptualisation

Osteoarthritis and Physical Activity Conceptualisation Scale

X

X

X

X

 Pain self-efficacy

PSEQ

X

X

X

X

 Exploratory: Implicit movement bias

Implicit association task

X

X

 Exploratory: Implicit environmental bias

Distance estimation task

Hill steepness estimation task

X

X

 Exploratory: Pain sensitivity to activity

Pain pre−/post- 6 min walk task

X

X

 Implicit motor imagery

Left/right judgement task

X

X

 Tactile acuity at the knee

Two point discrimination task

X

X

 OA pain conceptualisation

OA pain drawing task

X

X

 Self-regulated learning ability

Items from the Motivated Strategies for Learning and Regulation of Learning questionnaires

X

X

X

X

 Health care use^a

Resource use associated with the delivery of the intervention. Self-reported use of health services and co-interventions; MBS; and hospital admissions and emergency department presentations from administrative datasets

X

X

X

X

 Medication use^a

Self-reported medication use and PBS data from administrative datasets

X

X

X

X

 Expectation of treatment outcome

5 point ordinal scale

X

 Treatment credibility

Modified Treatment Credibility/Expectancy Questionnaire

X

 Intention to exercise

7 point ordinal scales (commitment, motivation, determination to exercise)

X

X

X

X

 COVID-19 impact on physical activity

7-point ordinal scale

X

X

X

X

 Adherence

Self-rated adherence to walking and strengthening program, 11-point NRS and number of days in past week exercise performed

X

X

X

Number of in-person sessions attended

X

X

X

Number of telehealth sessions attended

X

Review of patient diary

X

 Harms

Adverse events

X

X

X

 Blinding

Participant blinding assessed via allocation guesses (and reasons); then forced choice

X

Outcome assessor blinding (same method)

X

Therapist blinding (same method)

X^b

 Therapist related factors

Beliefs about exercise; self-rated via Therapist Beliefs about Exercise Questionnaire

X

X^c

Beliefs about pain; self-rated via Pain Attitudes and Beliefs Scale for Physiotherapists

X

X^c

Pain knowledge; assessed via rNPQ

X

X^c

Perceived intervention credibility; assessed via modified intervention credibility and expectancy questionnaire

X

X^d

X^d

Perceived connection with participant; self-rated via 101-point NRS Connectedness Scale

X