Table 1 Univariate analysis of recurrence in patients with chondroblastoma

Patient demographics

 Mean age at surgery (years, range)

19 (9–42)

15 (13–16)

0.2531

 Mean follow-up period (months, range)

51 (12–173)

67 (14–210)

0.7263

 Mean size of tumor (cm, range)

3.3 (1–10)

3.1 (2–4.5)

0.8844

 Sex

Male

42

40

2

0.1381

Female

17

14

3

 Radiological ABC-like changes

Yes

19

18

1

0.6089

No

22

19

3

Unknown

18

17

1

 Growth plate status

Open

24

20

4

0.2896

Close

33

32

1

Unknown

2

2

0

Treatments

 Type of Surgery

Curettage

57

52

5

 > 0.999

En bloc resection

2

2

0

 Curettage using a high-speed burr

Yes

13

12

1

0.8456

No

26

23

3

Unknown

18

17

1

 Ablation

Yes

19

17

2

 > 0.999

No

12

11

1

Unknown

28

26

2

 Replacement material

Allograft

11

10

1

0.5331

Autograft

4

3

1

Artificial bone

38

35

3

Bone cement

1

1

0

Unknown

1

1

0

None

6

6

0

 Denosumab

-

57

52

5

 > 0.999

 + 

2

2

0