Table 1 Baseline characteristics and imaging findings

Sex (year), N (%)

Female

43 (78.18)

22 (62.86)

Male

12 (21.82)

13 (37.14)

0.11

Age (year), mean (±SD)

57.25 (7.81)

51.46 (10.45)

< 0.01*

BMI (kg/m²), mean (±SD)

29.63 (6.47)

28.90 (5.15)

0.58

Side of the symptomatic knee, N (%)

Left

30 (54.55)

21 (60)

Right

25 (45.45)

14 (40)

0.61

Pain score (VAS) at the first visit, mean (±SD)

5.6 (2.07)

5.43 (2.54)

0.73

Duration of symptoms (day), mean (±SD)

132 (275)

90 (98)

0.39

Baseline radiographic findings

KL, mean (±SD)

0.91 (1.01)

0.91 (0.78)

0.99

Baseline MRI findings

Distance of tear from root attachment (mm), mean (±SD)

4.02 (3.2)

6.43 (5.21)

< 0.01*

Meniscal extrusion, N (%)

45 (81.82)

24 (68.57)

0.15

Extent of extrusion (mm), mean (±SD)

4.33 (1.24)

3.51 (1.02)

< 0.01*

WORMS for cartilage, N (%)

0–1

7 (12.73)

6 (17.14)

≥ 2

48 (87.27)

29 (82.86)

0.56

BMEL at the torn meniscal root attachment, N (%)

17 (30.91)

18 (51.43)

0.05

BMEL at the medial femoral condyle, N (%)

17 (30.91)

10 (28.57)

0.81

BMEL at the lateral femoral condyle, N (%)

1 (1.82)

0

0.42

BMEL at the medial tibia, N (%)

12 (21.82)

9 (25.71)

0.67

BMEL at the lateral tibia, N (%)

3 (5.45)

1 (2.86)

0.56

BMEL at the patella, N (%)

16 (29.09)

11 (31.43)

0.81

BMEL at the trochlear, N (%)

20 (36.36)

8 (22.86)

0.18

Subchondral bone fracture, N (%)

10 (18.18)

3 (8.57)

0.21