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 %) | |