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Table 1 Participant characteristics

From: Change in knee structure and change in tibiofemoral joint space width: a five year longitudinal population–based study

  Mean (SD)
n = 153
Gender 48 % female
Age (years) 62.2 (7.0)
BMI (kg/m2) 27.8 (4.7)
Any radiographic OA (%) 56.0
Osteophyte, any site (%) 9.2
Medial JSW (mm) 4.73 (0.97)
Lateral JSW (mm) 6.76 (1.37)
JSN scores (OARSI grade) (%)  
Medial 0 49.7
  1 41.2
  2 8.5
  3 0.7
Lateral 0 83.7
  1 13.1
  2 2.0
  3 1.3
Annual change in joint space width:  
 Medial (mm) −0.05 (0.16)
 Medial (%) −1.2 (3.9)
 Lateral (mm) −0.12 (0.24)
 Lateral (%) −1.8 (3.9)
Medial cartilage volume (tibia + femur, μL) 6296 (1523)
Lateral cartilage volume (tibia + femur, μL) 7080 (1671)
Annual change in cartilage volume:  
 Medial (μL) −134 (202)
 Medial (%) −2.1 (3.0)
 Lateral (μL) −106 (165)
 Lateral (%) −1.6 (2.5)
Meniscal extrusions  
 Medial – present at baseline (%) 16.3
 Medial – worsening extrusion (%) 9.2
 Lateral – present at baseline (%) 2.0
 Lateral – worsening extrusion (%) 0.7
Meniscal tears  
 Medial – present at baseline (%) 98.0
 Medial – worsening tear (%) 10.5
 Lateral – present at baseline (%) 96.7
 Lateral – worsening tear (%) 15.0
Cartilage defects  
 Medial - present at baseline (%) 23.5
 Medial - worsening (%) 37.7
 Lateral - present at baseline (%) 21.6
 Lateral - worsening (%) 36.4
Cartilage thickness (average, tibia & femur) (n = 67)
 Medial (mm) 3.07 (0.41)
 Lateral (mm) 3.33 (0.41)
Annual change in cartilage thickness  
 Medial (mm) −0.17 (0.27)
 Medial (%) −6.04 (8.45)
 Lateral (mm) −0.26 (0.3)
 Lateral (%) −8.12 (8.69)
  1. Change in cartilage and meniscal extrusion is over a time period of 2.4 years
  2. Change in joint space width is over a time period of 5 years
  3. Right knees only