Table 1 Comparison of baseline characteristics between axial chondroblastoma and extra-axial chondroblastoma

Age (years)

Continuous

132 (29.2 ± 13.4)

61 (34.1 ± 14.6)

71 (24.9 ± 10.8)

 < 0.001

Gender

Female

46

19

27

0.408

Male

86

42

44

Duration of symptoms (months)

Continuous

132 (8.3 ± 7.4)

61 (8.3 ± 6.7)

71 (8.3 ± 8.1)

0.955

Tumor size (in diameter, cm)

Continuous

132 (3.9 ± 1.8)

61 (5.3 ± 1.5)

71 (2.6 ± 0.9)

 < 0.001

Type of resection

Wide

65

27

38

0.289

Not wide

67

34

33

Surrounding tissue invasion

No

59

12

47

 < 0.001

Yes

73

49

24

Adjuvant radiotherapy

No

98

44

54

0.607

Yes

34

17

17

Preoperative sensory or motor dysfunction

No

97

39

58

0.021

Yes

35

22

13

Postoperative sensory or motor dysfunction

No

53

20

33

0.110

Yes

79

41

38

Secondary ABC

No

74

33

41

0.674

Yes

58

28

30

Chicken-wire calcification

No

63

24

39

0.074

Yes

69

37

23

Recurrence during follow-up

No

95

39

56

0.057

Yes

37

22

15

S100

Low

27

13

14

0.821

High

105

48

57

Vim

Low

37

9

28

0.002

High

95

52

43

CK

Low

91

42

49

0.984

High

41

19

22