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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