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Table 3 Association between patella alignment (fore groups) and adjusted means of medial PF joint space narrowing

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

Measure   Medial 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 1.97 (0.65–5.99) 2.09 (0.70–6.19) 2.47 (0.86–7.14) Linear, 0.1253
SA No. of knees 51 52 49 50  
  Range of SA 98–113 114–119 120–124 125–155  
  OR (95% CI) 1.00 1.37 (0.47–3.98) 1.66 (0.57–4.87) 3.17 (1.15–8.72) Linear, 0.0162
LPTA No. of knees 52 52 44 54  
  Range of LPTA -25 to 13 14–17 18–21 22–35  
  OR (95% CI) 1.00 1.532 (0.546–4.302) 1.697 (0.603–4.773) 2.185 (0.822–5.809) Linear, 0.0259
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 0.887 (0.346–2.272) 0.711 (0.272–1.857) 0.189 (0.057–0.638) Linear, 0.0026
  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.