Table 4 Differences in patient characteristics and self-reported outcome between patients with high and low pain catastrophizing score
All patients | TKA | UKA | |||||
|---|---|---|---|---|---|---|---|
PCS < 11 | PCS > 21 | P-value | PCS < 11 | PCS > 21 | PCS < 11 | PCS > 21 | |
n = 205 | n = 207 | n = 138 | n = 165 | n = 67 | n = 42 | ||
Female (%) | 106 (51.7) | 112 (54.1) | 0.63 | 73 (52.9) | 92 (55.8) | 33 (49.3) | 20 (47.6) |
Age years (SD) | 67.7 (9.2) | 66.7 (10.0) | 0.37 | 68.1 (9.0) | 67.0 (9.9) | 66.7 (9.5) | 65.9 (10.4) |
BMI kg/m2 (SD) | 28.2 (4.3) | 29.7 (4.4) | < 0.001 | 28.0 (4.2) | 29.8 (4.5) | 28.7 (4.4) | 29.3 (4.1) |
Alcohol > 24 g/Day (%) | 11 (5.6) | 9 (4.6) | 0.70 | 7 (5.2) | 8 (5.1) | 4 (6.5) | 1 (2.3) |
Smoking (%) | 25 (12.6) | 33 (16.9) | 0.22 | 21 (15.4) | 27 (17.2) | 4 (6.5) | 6 (15.8) |
Co-morbiditya (%) | 139 (67.8) | 153 (73.9) | 0.24 | 100 (72.5) | 124 (75.2) | 39 (58.2) | 29 (69.0) |
Walking aid (%) | 24 (12.1) | 38 (19.5) | 0.03 | 21 (15.4) | 30 (19.1) | 3 (4.8) | 8 (21.1) |
Living alone (%) | 53 (26.8) | 42 (21.5) | 0.23 | 37 (27.2) | 33 (21.7) | 16 (25.8) | 9 (23.7) |
Operated bilateralb (%) | 20 (9.7) | 16 (7.7) | 0.52 | 13 (9.4) | 13 (7.9) | 7 (10.5) | 7 (7.1) |
Outcome | |||||||
Preoperatively | |||||||
OKS (IQR) (n = 412) | 29 (9) | 21 (8) | < 0.001 | 28 (10) | 21 (8) | 31 (8) | 22 (8) |
Pain (%) (n = 412) | 127 (61.2) | 187 (90.3) | < 0.001 | 89 (64.5) | 152 (92.1) | 38 (56.7) | 35 (83.3) |
SF-36 (PF) (IQR) (n = 404) | 50 (35) | 35 (25) | < 0.001 | 50 (35) | 35 (25) | 57.5 (30) | 35 (20) |
EQ 5D (IQR) (n = 376) | 0.72 (0.08) | 0.66 (0.33) | < 0.001 | 0.72 (0.05) | 0.66 (0.33) | 0.77 (0.10) | 0.59 (0.40) |
4 months | |||||||
OKS (IQR) (n = 336) | 39 (10) | 36 (12) | 0.001 | 37 (11) | 35 (11) | 41 (8) | 37 (12) |
Pain (%) (n = 412) | 32 (17.7) | 56 (33.9) | 0.001 | 25 (20.8) | 47 (36.2) | 7 (11.5) | 9 (25.7) |
SF-36 (PF) (IQR) (n = 346) | 80 (25) | 75 (30) | 0.004 | 75 (30) | 75 (30) | 85 (15) | 80 (30) |
EQ 5D (IQR) (n = 331) | 0.82 (0.23) | 0.82 (0.28) | 0.023 | 0.82 (0.28) | 0.82 (0.28) | 0.84 (0.18) | 0.82 (0.23) |
12 months | |||||||
OKS (IQR) (n = 412) | 42 (10) | 38 (13) | < 0.001 | 41 (11) | 37 (14) | 44 (8) | 41 (8) |
Pain (%) (n = 412) | 21 (10.2) | 49 (23.7) | < 0.001 | 16 (11.6) | 42 (25.5) | 5 (7.5) | 7 (16.7) |
SF-36 (PF) (IQR) (n = 401) | 85 (25) | 75 (30) | 0.001 | 80 (30) | 75 (32.5) | 85 (20) | 80 (20) |
EQ 5D (IQR) (n = 397) | 0.84 (0.22) | 0.82 (0.28) | 0.002 | 0.84 (0.22) | 0.82 (0.28) | 1 (0.28) | 0.82 (0.23) |