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Table 4 Relationship between parameters of patellofemoral geometry and WOMAC pain and patella cartilage volume: the difference between obese and non-obese subjects

From: The associations between indices of patellofemoral geometry and knee pain and patella cartilage volume: a cross-sectional study

  Obese subgroup   Non-obese subgroup   
  Regression coefficient (95% CI)* P value Regression coefficient (95% CI)* P value P value for difference†
WOMAC pain score
LCPA -3.13 (-5.60, -0.67) 0.01 0.56 (-0.63, 1.75) 0.36 0.01
SA 0.42 (-1.46, 2.29) 0.66 -0.1 (-0.79, 0.77) 0.98 0.68
I-S ratio 87.80 (-30.86, 206.46) 0.15 -37.58 (-101.45, 26.29) 0.25 0.06
Medial patella cartilage volume
LCPA 86.36 (26.15, 146.58) 0.01 47.81 (-22.37, 117.99) 0.18 0.41
SA 12.01 (-35.76, 59.77) 0.62 -55.61 (-104.79, -6.43) 0.03 0.05
I-S ratio -3093.84 (-6260.66, 72.98) 0.06 -2943.85 (-6497.61, 603.91) 0.10 0.95
Lateral patella cartilage volume
LCPA 49.36 (-29.20, 127.93) 0.22 48.77 (-52.06, 149.60) 0.34 0.99
SA 53.63 (-6.93, 114.19) 0.08 31.12 (-44.23, 106.48) 0.41 0.64
I-S ratio -3594.17 (-75463.31, 357.98) 0.07 -2433.12 (-7752.83, 2886.59) 0.37 0.73
  1. LCPA = lateral condyle-patella angle, SA = sulcus angle, I-S Ratio = Insall-Salvati Ratio, CI = Confidence Interval
  2. *adjusted for age, gender, BMI, patella cartilage volume and bone size
  3. †p value calculated using independent samples z-test for difference between subgroups