Table 3 Radiological progression of joint space changes and bone destruction. Values are represented as mean ± standard deviation

Superior joint space narrowing (mm/year)

2.44 ± 1.48

0.823 ± 1.08

(P = 0.019*)

0.765 ± 0.862

(P = 0.001*)

−0.584 ± 2.77

(P = 0.000*)

Superior joint space narrowing (percentage/year)

49.2 ± 29.7

11.9 ± 8.45

(P = 0.004*)

18.8 ± 21.2

(P = 0.003*)

−16.4 ± 76.2

(P = 0.003*)

Leg length shortening (mm/year)

15.7 ± 12.4

14.8 ± 27.0

(P = 0.902)

2.40 ± 2.27

(P = 0.001*)

6.02 ± 10.4

(P = 0.007*)

Superior acetabular bone loss (mm/year)

7.24 ± 3.69

3.06 ± 5.53

(P = 0.018*)

0.957 ± 1.32

(P = 0.000*)

2.21 ± 3.67

(P = 0.000*)

Acetabular volumetric widening (mm/year)

3.83 ± 5.33

2.08 ± 3.20

(P = 0.281)

0.459 ± 0.641

(P = 0.032*)

1.32 ± 2.92

(P = 0.044*)

Vertical head diameter change (mm/year)

15.2 ± 22.9

13.9 ± 27.4

(P = 0.884)

1.24 ± 1.49

(P = 0.031*)

6.40 ± 9.82

(P = 0.074)

Horizontal head diameter change (mm/year)

13.7 ± 21.8

6.29 ± 16.6

(P = 0.282)

1.05 ± 1.39

(P = 0.039*)

2.65 ± 6.33

(P = 0.012*)