Table 1 Characteristics of the patients. The grades of the defect have been classified according the Outerbridge classification

n.1

46

25.8

46

IV

III

Medial condyle

Tibial plateau

30 × 18

20 × 20

No

n.2

37

32.4

45

IV

IV

Patella

Troclea

35 × 30

35 × 30

Knee arthroscopy and microfractures

n.3

25

28.3

46

IV

Patella

12 × 14

Microfractures and extensor apparatus realignment

n.4

33

21

46

IV

Patella

15 × 15

No

n.5

33

24.8

36

III

Medial condyle

26 × 30

Medial meniscectomy and meniscal transplant

n.6

18

20.7

37

IV

Medial tibial plateau

15 × 10

Arhtroscopic partial meniscectomy

n.7

38

21.6

29

IV

Medial condyle

25 × 20

Knee arthroscopy and microfractures

n.8

34

27

30

IV

Patella

Troclea

10 × 20

10 × 15

MPFL reconstruction

n.9

34

26.5

30

III

Medial condyle

20 × 20

ACL reconstruction

n.10

51

27.5

28

IV

Medial condyle

30 × 25

Knee arthroscopy, microfractures, partial meniscectomy

n.11

40

23

18

IV

IV

Patella

Troclea

30 × 20

20 × 20

Knee arthroscopy, microfractures

n.12

24

32.4

24

III

Lateral condyle

20 × 15

Open wedge distal femoral osteotomy

n.12

24

32.4

27

IV

Lateral condyle

20 × 20

Open wedge distal femoral osteotomy

n.13

48

26

24

IV

Medial and lateral Patella’s facets

30 × 9

No

n.14

20

26

24

IV

Patella

10 × 15

No

n.15

32

25.9

24

IV

Lateral condyle

20 × 18

No