Results
Knee injury
HAND OSTEOARTHRITIS, SECONDARY
The trial randomized 168 participants: 55 to strength exercise, 56 to aerobic exercise, and 57 to usual care. Seven participants withdrew their informed consent (due to lack of time) and 19 participants showed up only on the baseline assessment. The participant flow and reasons for loss to follow-up are shown in Fig. 
Participant flow during the trial. *Final sample excluded seven participants who withdrew their informed consent to participate (strength exercise: n=3, aerobic exercise: n=2, usual care: n=2)Participants’ baseline characteristics are presented in Table 
Baseline characteristics of the study participants (n = 161) • Working • Sick leave/Retired46 (94)3 (6)44 (88)6 (12)41 (80)10 (20) • One knee • Both knees31 (60)21 (40)39 (75)13 (25)32 (60)21 (40) • 4–6 months • 7–9 months • 10–12 months11 (22)9 (18)5 (12)15 (33)11 (26)9 (24)12 (27)17 (38)14 (37)N = number, sd = standard deviation, *data had missing values
Descriptive values for the primary and secondary outcome measuresMean values (standard deviation) are presented. KOOS; Knee injury and osteoarthritis outcomes core, QoL, knee-related quality of life; ADL, activities of daily living; EQ-5D-5 L, EuroQoL-5 Dimensions 5 Levels, VAS, visual analogue scale: 0 best, 10 worst; Nm, newton meter; kg, kilograms (body weight); VO