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Table 2 Preoperative knee pain and radiographic assessment

From: Characterization of osteoarthritic human knees indicates potential sex differences

Variable Female Male p valuea
Radiographic assessment    
 Kellgren-Lawrence Grading Scale - no. (%)    0.37
  Grade 3 1 (10 %) 0 (0 %)  
  Grade 4 9 (90 %) 10 (100 %)  
Median pain-pressure threshold (IQR) - kg    
 Medial joint line 4.5 (3.7, 5.1) 5.3 (4.1, 6.9) 0.16
 1 cm above the medial joint line 3.0 (2.7, 3.8) 5.1 (4.5, 6.2) 0.007
 1 cm below the medial joint line 4.0 (3.5, 4.1) 5.6 (4.0, 6.8) 0.10
Area(s) of knee pain - no. (%)b    
 Localized    
  Superior lateral 0 (0 %) 1 (10 %) 1.00
  Patella 0 (0 %) 1 (10 %) 1.00
  Medial joint line 3 (30 %) 2 (20 %) 1.00
  Inferior lateral 1 (10 %) 0 (0 %) 1.00
  Inferior medial 1 (10 %) 0 (0 %) 1.00
 Regional    
  Medial 1 (10 %) 1 (10 %) 1.00
  Patella 1 (10 %) 2 (20 %) 1.00
 Diffuse pain 4 (40 %) 3 (30 %) 1.00
  1. a p values result from a Wilcoxon rank sum test for numerical variables and Fisher’s exact test for categorical variables
  2. bMore than one location per patient was possible. Pain was not reported at any of the following locations: superior medial, lateral joint line, back of knee, lateral (regional), and back of knee (regional)