Table 1. Eligibility criteria.

Population	Adult participants (≥18 years) with lower limb OA (hip and/or knee), diagnosis through self-report of symptoms or imaging [2]. RCTs including participants with other joint related pathologies (e.g. rheumatoid arthritis, hemochromatosis) that contributed to ≥25% of the population, or participants who were awaiting, or had undergone joint surgery for treatment of OA symptoms were excluded.
Interventions	Land based outpatient intervention where a physiotherapist delivered the intervention individually (1 to 1) to the patient. Although others (e.g. healthcare professionals/ spouses) could be involved in the intervention’s delivery, the physiotherapist had to be the primary healthcare provider and their role needed to be clearly established. The intervention had to include at least one BCT specifically enhancing PA adherence away from the clinic e.g. activity diary/pedometer or follow up care (phone calls) that made it unique from its comparator group (as defined by the V1 taxonomy) to enable measurement of its effectiveness.
Comparisons	Other ‘active’ or ‘placebo’ interventions, ‘no treatment’ or ‘usual care’
Outcomes	Primary Outcomes: Physical Activity or Adherence measures Secondary Outcomes: Pain, Function, Quality of Life, Self-Efficacy, Any adverse events
Trial design	Randomised controlled trials (RCTs)
Language	Written in, or translated into English