Table 2.

Digital health for PA^a interventions in people with knee osteoarthritis.

Study	Population	Design	Intervention			Comparator or comparators			Primary outcome findings
			Description	Sample size	Description		Sample size
Bossen et al [38]	Knee or hip osteoarthritis	Pre or post	Join2Move (fully automated web-based PA program)	20	N/Ab		N/A	No improvements in PA or self-perceived effect
Li et al [41]	Knee osteoarthritis	RCTc	Group in-person education+ activity monitor+ telephone counseling	17	Same intervention delayed by 1 month		17	Greater improvement in moderate to vigorous PA in the intervention vs comparator
Skrepnik et al [36]	Knee osteoarthritis treated with Hylan G-F 20	RCT	Hyaluronic acid injection+unblinded activity monitor phone app	107	Hyaluronic acid injection+blinded activity monitor		104	Improvements in mobility in the intervention vs comparator
Bartholdy et al [37]	Knee osteoarthritis	RCT	Motivational SMS text messaging related to PA	19	No treatment		19	No difference between groups for time spent physically inactive
Zaslavsky et al [39]	Osteoarthritis	Pre or post	Activity monitor, motivational SMS text messaging, telephone coaching, and phone app for feedback	24	N/Ab		N/A	Improvements in sleep but not PA from baseline
Allen et al [40]	Knee or hip osteoarthritis	Pre or post	PA screening, coaching phone calls, emails, and phone follow-up	67	N/Ab		N/A	No difference in improvement in minutes of moderate to vigorous PA

^aPA: physical activity.

^bN/A: not applicable.

^cRCT: randomized controlled trial.