Table 1 The demographics and preoperative characteristics according to final knee flexion after TKA
Variable | Final knee flexion | p-value | |
|---|---|---|---|
≥ 130° (N = 619) | < 130° (N = 291) | ||
Age (years) | 69.1 ± 6.6 | 68.4 ± 8.4 | n.s. |
Sex (female) | 575 (92.9%) | 274 (94.2%) | n.s. |
Height (cm) | 152.9 ± 6.3 | 152.3 ± 6.7 | n.s. |
Weight (kg) | 62.5 ± 8.6 | 62.9 ± 8.9 | n.s. |
Body mass index (kg/m2) | 26.7 ± 3.1 | 27.1 ± 3.4 | n.s. |
Diagnosis | n.s. | ||
Osteoarthritis | 613 (99.0%) | 288 (99.0%) | |
Rheumatoid arthritis | 2 (0.3%) | 2 (0.7%) | |
Others | 4 (0.6%) | 1 (0.3%) | |
Side (right) | 306 (49.4%) | 154 (52.9%) | n.s. |
Bilateral TKA | 426 (68.8%) | 183 (62.9%) | n.s. |
Patellar resurfacing | 516 (83.4%) | 251 (86.3%) | n.s. |
Additional lateral release | 4 (0.7%) | 3 (1.0%) | n.s. |
History of operation on the knee | 11 (1.8%) | 10 (3.4%) | n.s. |
Follow-up time (years) | 5.1 [2.9, 7.8] | 4.6 [2.0, 7.0] | 0.010 |
Preoperative functional evaluation | |||
Knee flexion (°) | 129.2 ± 11.4 | 113.9 ± 19.8 | < 0.001 |
Flexion contracture (°) | 12.3 ± 8.2 | 13.8 ± 8.6 | 0.012 |
Range of motion (°) | 116.8 ± 15.4 | 100.1 ± 23.3 | < 0.001 |
Knee Society knee score | 47.4 ± 16.8 | 46.1 ± 18.2 | n.s. |
Knee Society function score | 41.3 ± 18.9 | 42.0 ± 19.3 | n.s. |
Hospital for Special Surgery score | 56.6 ± 15.2 | 55.0 ± 15.6 | n.s. |
WOMAC - pain | 9.1 ± 3.5 | 8.9 ± 3.4 | n.s. |
WOMAC - stiffness | 4.2 ± 1.9 | 4.1 ± 1.9 | n.s. |
WOMAC - physical function | 38.2 ± 14.6 | 37.9 ± 14.0 | n.s. |
WOMAC total | 50.4 ± 18.8 | 49.7 ± 18.3 | n.s. |