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Table 2 Association between patellar alignment (fore groups) and adjusted means of lateral PF joint space narrowing

From: The association between patellar alignment on magnetic resonance imaging and radiographic manifestations of knee osteoarthritis

Measure   Lateral joint space narrowing p for trend
  Quartile... 1 2 3 4  
PLR No. of knees 50 50 50 52  
  Range of PLR 0.66–0.87 0.88–0.98 0.98–1.12 1.13–1.71  
  OR (95% CI) 1.00 1.56 (0.66–3.67) 1.36 (0.57–3.23) 2.77 (1.20–6.39) Linear, 0.0136; U-shaped, 0.1630
SA No. of knees 51 52 49 50  
  Range of SA 98–113 114–119 120–124 125–155  
  OR (95% CI) 1.00 1.48 (0.66–3.33) 1.58 (0.71–3.56) 1.43 (0.63–3.24) Linear, 0.1206; U-shaped, 0.6204
LPTA No. of knees 52 51 44 54  
  Range of LPTA -25 to 13 14–17 18–21 22–35  
  OR (95% CI) 1.00 0.46 (0.21–0.97) 0.32 (0.14–0.73) 0.10 (0.04–0.27) Linear, <0.0001; U-shaped, 0.9073
BO No. of knees 49 49 51 50  
  Range of BO 38.46–54.55 54.76–60.42 60.47–66.67 66.67–100  
  OR (95% CI) 1.00 2.16 (0.78–5.96) 4.22 (1.58–11.25) 8.26 (3.06–22.30) Linear, <0.0001; U-shaped, 0.2468
  1. Results are adjusted for age, sex and bone mass index. PLR, patellar length ratio; SA, sulcus angle; LPTA, lateral patellar tilt angle; BO, bisect offset; OR, odds ratio; CI, confidence interval.