Table 6 Proportion of medial and lateral tibiofemoral or patellofemoral osteoarthritis (OA) relative to the worst affected knee and compartment among floor layers (n = 134) and graphic designers (n = 120)

Total

Medial

Lateral

Total

Medial

Lateral

N

n (%)

n (%)

N

n (%)

n (%)

≤ 49 years

43

7

Tibiofemoral OA

4 (9.3)

1 (2.3)

1 (14.3)

0 -

Patellofemoral OA

1 (2.3)

1 (2.3)

0 -

2 (28.6)

50–59 years

72

73

Tibiofemoral OA

8 (11.1)

4 (5.6)

4 (5.5)

0 -

Patellofemoral OA

6 (8.3)

3 (4.2)

3 (4.1)

4 (5.5)

≥ 60 years

19

40

Tibiofemoral OA

5 (26.3)

0 -

7 (17.5)

3 (7.5)

Patellofemoral OA

1 (5.3)

0 -

7 (17.5)

5 (12.5)