Participants, mean (SD)

Between-group

mean difference

(95% CI)

APP

CONTROL

(n = 26)

(n = 31)

Baseline Characteristic

Age, y

67 (8.2)

64.7 (7.7)

2.3 (−1.9, 6.5)

Sex, No. (%)

Women

14 (53.8)

17 (54.8)

Men

12 (46.2)

14 (45.2)

Primary Outcome

System Usability Scale (SUS) Score

83.1 (15.6)

79.6 (15.8)

3.5 (−5.2, 12.1)

Secondary Outcomes

Timed up and go, s

12.2 (5.4)

11.7 (2.9)

0.5 (−1.8, 2.7)

Single leg stand test, s, surgical leg

18.1 (9.9)

20.5 (10.5)

2.4 (−3.1, 7.9)

30-s sit-to-stand, No.

10.3 (4.8)

11.1 (3.5)

0.8 (−1.4, 3.1)

KOOS JR, surgical leg

52.3 (13.6)

49.6 (13.9)

2.8 (−4.7, 10.2)

PROMIS, physical

45.9 (8.4)

43.4 (7.7)

2.5 (−1.7, 6.8)

VR-12 Health Survey, physical

31.2 (12.4)

29.1 (12.4)

2.1 (−4.5, 8.7)

mABC

81.0 (16.9)

82.7 (14.3)

1.7 (−7.4, 10.8)