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Table 1 Patient characteristics at baseline: first versus fourth quartile based on cartilage volume loss

From: Risk factors associated with the loss of cartilage volume on weight-bearing areas in knee osteoarthritis patients assessed by quantitative magnetic resonance imaging: a longitudinal study

  Global Medial compartment
  First quartile (greatest loss) (n = 27) Fourth quartile (least loss) (n = 27) P value First quartile (greatest loss) (n = 27) Fourth quartile (least loss) (n = 27) P value
Age 63.7 ± 7.2 61.3 ± 7.5 0.23 64.1 ± 7.4 61.6 ± 7.8 0.24
Female 58% 67% 0.50 48% 74% 0.05
Weight (kg) 84.9 ± 14.9 77.6 ± 14.3 0.07 86.3 ± 14.9 78.6 ± 16.3 0.07
Body mass index 31.4 ± 3.9 29.1 ± 4.9 0.06 31.4 ± 3.6 29.6 ± 4.8 0.14
Joint space width (mm) 2.84 ± 0.54 3.06 ± 0.64 0.18 2.70 ± 0.67 3.18 ± 0.66 0.01
WOMAC pain 38.8 ± 22.1 35.4 ± 23.7 0.54 37.3 ± 23.2 34.1 ± 23.0 0.60
WOMAC function 44.3 ± 23.3 38.0 ± 24.8 0.34 43.6 ± 23.9 37.2 ± 24.8 0.33
SF-36 39.0 ± 8.8 34.8 ± 9.8 0.10 40.2 ± 8.3 35.9 ± 8.4 0.07
Severe medial meniscal tear 50% 19% 0.01 51% 11% 0.002
Medial meniscal tear 85% 81% 0.76 92% 66% 0.02
Severe medial meniscal extrusion 54% 7% 0.0001 56% 7% 0.0003
Medial meniscal extrusion 81% 52% 0.02 82% 48% 0.01
Bone hypersignal 77% 48% 0.03 81% 37% 0.002
Bone hypersignal in the medial compartment 62% 48% 0.34 59% 33% 0.06
Bone hypersignal in the lateral compartment 50% 15% 0.005 59% 15% 0.001
  1. Values are mean ± standard deviation, p values are two-sided Student t test; or values are in percentage, p values are Fisher exact test. WOMAC, Western Ontario and McMaster Universities Osteoarthritis Index.