Table 3.

Degree of anterior knee pain, by knee activity.

Activity	3-month follow up n (%)	6-month follow up n (%)	p-value
Ascending 30° slope
- no pain	17 (48.6%)	29 (82.9%)
- mild	17 (48.6%)	6 (17.1%)
- moderate	1 (2.9%)	0 (0%)
- severe pain	0 (0%)	0 (0%)	0.990
Running
- no pain	16 (45.7%)	25 (71.4%)
- mild	19 (54.3%)	10 (28.6%)
- moderate	0 (0%)	0 (0%)
- severe pain	0 (0%)	0 (0%)	0.999
Ascending stairs
- no pain	12 (34.3%)	19 (54.3%)
- mild	19 (54.3%)	15 (42.9%)
- moderate	4 (11.4%)	1 (2.9%)
- severe pain	0 (0%)	0 (0%)	0.375
Descending stairs
- no pain	11 (31.4%)	23 (65.7%)
- mild	19 (54.3%)	11 (31.4%)
- moderate	5 (14.3%)	1 (2.9%)
- severe pain	0 (0%)	0 (0%)	0.219
Sitting cross-legged
- no pain	26 (74.3%)	34 (97.1%)
- mild	9 (25.7%)	1 (2.9%)
- moderate	0 (0%)	0 (0%)
- severe pain	0 (0%)	0 (0%)	0.999
Sitting one-legged
- no pain	28 (80.0%)	32 (91.4%)
- mild	6 (17.1%)	2 (5.7%)
- moderate	1 (2.9%)	1 (2.9%)
- severe pain	0 (0%)	0 (0%)	0.999
Jumping
- no pain	4 (11.4%)	14 (40.0%)
- mild	23 (65.7%)	19 (54.3%)
- moderate	8 (22.9%)	2 (5.7%)
- severe pain	0 (0%)	0 (0%)	0.070a
Squatting
- no pain	16 (45.7%)	22 (62.9%)
- mild	13 (37.1%)	13 (37.1%)
- moderate	6 (17.1%)	0 (0%)
- severe pain	0 (0%)	0 (0%)	0.031a
Kneeling
- no pain	3 (9.1%)	10 (29.4%)
- mild	13 (39.4%)	15 (44.1%)
- moderate	12 (36.4%)	7 (20.6%)
- severe pain	5 (15.2%)	2 (5.9%)	0.039a

Degree of anterior knee pain determined by VAS for pain: VAS = 0, no pain; VAS = 1–3, mild pain; VAS = 4–7, moderate pain; and VAS = 8–10, severe pain.

^aDifference of the considerable knee pain as a VAS pain score ≥4 of each activity with level of significant (p-value less than 0.05).