Outcome assessment	Assessment Timepoint		Cohort Assessed	Usability & Feasibility Criteria
Outcome assessment	Preop	Postop	Cohort Assessed	Usability & Feasibility Criteria
System usability:
System usability scale (SUS) questionnaire	X	X	APP group only	75% of participants will score at least 72
Feasibility:
Enrollment criterion: Personal device ownership	X	X	All potential enrollees	75% of potential enrollees will own
Technology-based barriers to participation	X	X	All potential enrollees	75% will report no barriers
Preop & postop functional assessments completion	X	X	APP & CONTROL	90% will complete
Functional outcomes:
Timed up and go	X	X	APP & CONTROL
30-s sit-to-stand	X	X	"
Single leg stand test	X	X	"
Patient-reported outcomes:
KOOS JR, surgical leg	X	X	APP & CONTROL
PROMIS, physical	X	X	"
VR-12 Health Survey, physical	X	X	"
mABC	X	X	"