Table 1 Femoral, tibial and knee TKA component rotation angles measurements

Femoral rotation

BFA

6.3 ± 1.7

(5.5–7.1)

3.7 (3.3)

(0.2–12.2)

6.7 ± 2.5

(5.6–7.8)

4.6 (3.0)

(0.1–14.8)

5.6 ± 1.7

(4.8–6.3)

3.1 (3.6)

(0.4–13.0)

Tibial rotation

BTA

3.4 ± 4.4

1.5–5.4

9.2 ± 2.6

8.0–10.3

6.3 ± 3.4

4.8–7.8

14.0 (5.3)

3.0–17.0

0.7 ± 5.2

−1.6 to 3.0

7.9 ± 3.4

6.4–9.4

ATA

− 5.4 ± 0.6

−6.8 to −4.1

−1.7 (1.8)

−24.0 to −0.4

−4.8 (4.8)

− 24.0 to −0

−1.3 (8.6)

−26.5 to −0

−5.4 ± 3.6

−7.0 to −3.8

−1.8 ± 1.2

−2.3 to −1.3

BM_PTCA

− 23.1 ± 9.1

−27.2 to −19.1

−13.9 ± 6.1

−16.6 to −11.2

−25.6 ± 8.8

−29.5 to −21.7

−14.6 ± 6.6

−17.3 to −11.4

−23.4 ± 8.1

−27.0 to −19.8

−12.3 ± 6.4

−15.1 to −9.4

Knee rotation

TE_PTCA

6.0 ± 3.2

(4.6–7.4)

3.0 ± 2.3

(2.0–4.0)

6.0 ± 3.9

(4.3–7.8)

2.6 (4.2)

(0.1–9.4)

5.3 ± 2.9

(4.0–6.6)

2.2 (3.7)

(0.1–9.7)

BC_PTCA

2.4 (2.4)

(0.5–8.8)

4.6 ± 2.5

(3.5–5.6)

2.9 (5.0)

(0.2–10.1)

4.8 (3.1)

(0.1–15.3)

2.0 (3.6)

(0.1–8.6)

4.5 ± 2.6

(3.4–5.6)

TE_BM

19.0 ± 7.5

(15.7–22.3)

13.1 ± 6.0

(10.5–15.7)

20.5 ± 6.9

(17.5–23.6)

13.6 ± 6.5

(10.8–16.4)

17.8 ± 8.1

(14.2–21.5)

12.2 ± 6.4

(9.5–15.0)

BC_BM

25.2 ± 8.5

(21.5–29.0)

17.5 ± 6.5

(14.7–20.3)

27.0 ± 7.9

(23.5–30.5)

18.2 ± 7.0

(15.2–21.2)

23.3 ± 9.0

(19.4–27.3)

16.5 ± 6.3

(13.8–19.2)