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Table 2 Clinical characteristics of the sample of subjects scheduled for TKA by WOMAC pain group

From: Association between activity limitations and pain in patients scheduled for total knee arthroplasty

  WOMAC Pain Group p-value (trend)
Low Medium High Overall
(0–25) (26–40) (41–100)
n = 43 (21 %) n = 68 (34 %) n = 91 (45 %) n = 202
WOMAC Pain: mean (SD) 16 (7) 35 (4) 58 (14) 41 (12) <0.001
WOMAC Function: mean (SD) 23 (11) 35 (10) 54 (14) 41 (18) <0.001
HRQoL (EQ-5D-3 L Index): mean (SD) 0.81 (0.08) 0.77 (0.08) 0.64 (0.18) 0.72 (0.15) <0.001
KOOS Sport and Activity: mean (SD) 63 (20) 68 (24) 84 (19) 74 (23) <0.001
Knee extension: no. (%)      0.006
 More than 50 from straight 19 (44 %) 36 (54 %) 62 (68 %) 117 (58 %)  
 Completely straight 24 (56 %) 31 (46 %) 29 (32 %) 84 (42 %)  
Knee flexion: no. (%)      0.046
 1000 or less 5 (12 %) 11 (16 %) 23 (25 %) 39 (19 %)  
 More than 1000 38 (88 %) 57 (84 %) 68 (75 %) 163 (81 %)  
Limp: no. (%)      0.001
 Moderate to severe 15 (35 %) 29 (43 %) 57 (63 %) 101 (50 %)  
 None to slight 28 (65 %) 39 (57 %) 34 (37 %) 101 (50 %)  
Walking distance: no. (%)      <0.001
 Less than 5 blocks 8 (19 %) 26 (38 %) 54 (59 %) 88 (44 %)  
 5 to 20 blocks 20 (48 %) 31 (46 %) 30 (33 %) 81 (40 %)  
 Unlimited 14 (33 %) 11 (16 %) 7 (8 %) 32 (16 %)  
How much did pain interfere with work or housework?: no. (%)      <0.001
 Moderately to extremely 15 (35 %) 43 (63 %) 79 (87 %) 137 (68 %)  
 Not at all to a little bit 28 (65 %) 25 (37 %) 12 (13 %) 65 (32 %)  
Use of a supportive device: no. (%)      0.10
 Yes 9 (21 %) 15 (22 %) 30 (33 %) 54 (27 %)  
 No 34 (79 %) 53 (78 %) 61 (67 %) 148 (73 %)