Table 4.
Comparison of joint line change based on polyethylene style
| CPS (N = 84; 58 RA-TKA, 26 C-TKA) | MC (N = 240; 169 RA-TKA, 71 C-TKA) | CR (N = 102; 61 RA-TKA, 41 C-TKA) | PS (N = 377; 222 RA-TKA, 155 C-TKA) | UC (N = 197; 90 RA-TKA, 107 C-TKA) | p value | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| JL change | − 0.35 (3.5) | − 0.40 (3.3) | 0.23 (3.5) | − 0.73 (3.0) | 0.76 (3.1) | < 0.001 | |||||
| RA-TKA | C-TKA | RA-TKA | C-TKA | RA-TKA | C-TKA | RA-TKA | C-TKA | RA-TKA | C-TKA | ||
| − 0.27 (3.6) | − 0.55 (3.4) | − 0.05 (3.3) | − 1.3 (3.3) | 0.31 (3.4) | 0.11 (3.8) | − 0.48 (3.0) | − 1.1 (2.9) | 0.94 (3.2) | 0.61 (3.0) | ||
| JL change directionality: | < 0.001 | ||||||||||
| Elevation | 51 (60.7%) | 145 (60.4%) | 49 (48.0%) | 225 (59.7%) | 93 (47.0%) | ||||||
| RA-TKA | C-TKA | RA-TKA | C-TKA | RA-TKA | C-TKA | RA-TKA | C-TKA | RA-TKA | C-TKA | ||
| 34 (58.6%) | 17 (65.4%) | 100 (59.2%) | 45 (63.4%) | 31 (50.8%) | 18 (43.9%) | 123 (55.4%) | 100 (65.4%) | 44 (48.9%) | 48 (44.4%) | ||
| No change | 5 (5.95%) | 17 (7.08%) | 5 (4.9%) | 36 (9.5%) | 9 (4.55%) | ||||||
| RA-TKA | C-TKA | RA-TKA | C-TKA | RA-TKA | C-TKA | RA-TKA | C-TKA | RA-TKA | C-TKA | ||
| 3 (5.2%) | 2 (7.7%) | 11 (6.5%) | 6 (8.5%) | 2 (3.3%) | 3 (7.3%) | 29 (13.1%) | 7 (4.6%) | 2 (2.2%) | 7 (6.5%) | ||
| Distalization | 28 (33.3%) | 78 (32.5%) | 48 (47.1%) | 116 (30.8%) | 96 (48.5%) | ||||||
| RA-TKA | C-TKA | RA-TKA | C-TKA | RA-TKA | C-TKA | RA-TKA | C-TKA | RA-TKA | C-TKA | ||
| 21 (36.2%) | 7 (26.9%) | 58 (34.3%) | 20 (28.2%) | 28 (45.9%) | 20 (48.8%) | 70 (31.5%) | 46 (30.1%) | 44 (48.9%) | 52 (48.1%) | ||
Values given as mean (standard deviation) or number (%). Bold values indicate statistical significance
CPS constrained posterior-stabilized, MC medial-congruent, CR posterior cruciate retaining, PS posterior stabilized, UC ultra-congruent