Table 4 Association between patella alignment (fore groups) and adjusted means of lateral patellar osteophytes

PLR

No. of knees

100

100

100

104

Range of PLR

0.66–0.87

0.88–0.98

0.98–1.12

1.13–1.71

OR (95% CI)

1.00

1.70 (1.01–2.86)

1.23 (0.73–2.08)

1.67 (0.98–2.84)

Linear, 0.0138; U-shaped, 0.0943

SA

No. of knees

102

104

98

100

Range of SA

98–113

114–119

120–124

125–155

OR (95% CI)

1.00

1.62 (0.97–2.71)

1.83 (1.09–3.08)

1.52 (0.91–2.55)

Linear, 0.0804; U-shaped, 0.8875

LPTA

No. of knees

104

102

88

108

Range of LPTA

-25 to 13

14–17

18–21

22–35

OR (95% CI)

1.00

0.35 (0.21–0.60)

0.51 (0.30–0.88)

0.29 (0.17–0.49)

Linear, <0.0001; U-shaped, 0.1076

BO

No. of knees

98

98

102

100

Range of BO

38.46–54.55

54.76–60.42

60.47–66.67

66.67–100

OR (95% CI)

1.00

0.92 (0.54–1.54)

1.33 (0.79–2.25)

3.07 (1.77–5.34)

Linear, <0.0001; U-shaped, 0.2038