Table 1.
Demographic and alignment characteristics of the study population.
| Characteristic | Within 2° of constitutional (n = 98) | >2° from constitutional (n = 90) | Total (N = 188) | P value |
|---|---|---|---|---|
| Demographics | ||||
| Age at Surgery (years) | 67.4 (6.9) | 68.4 (8.3) | 67.9 (7.6) | .36 |
| Female | 46 (46.9%) | 50 (55.6%) | 96 (51.1%) | .24 |
| BMI | 31.5 (27.5-35.0) | 29.8 (26.9-34.4) | 30.8 (27.2-34.7) | .18 |
| Osteoarthritis diagnosis | 91 (92.9%) | 85 (94.4%) | 176 (93.6%) | .87 |
| Alignment parameters | ||||
| Constitutional alignment | <.001 | |||
| Valgus >5° | 0 (0.0%) | 22 (24.4%) | 22 (11.7%) | |
| Valgus ≤5° | 26 (26.5%) | 33 (36.7%) | 59 (31.4%) | |
| Neutral | 0 (0.0%) | 1 (1.1%) | 1 (0.5%) | |
| Varus ≤5° | 67 (68.4%) | 18 (20.0%) | 85 (45.2%) | |
| Varus >5° | 5 (5.1%) | 16 (17.8%) | 21 (11.2%) | |
| CPAK classification | <.001 | |||
| Class I | 35 (35.7%) | 22 (24.4%) | 57 (30.3%) | |
| Class II | 48 (49.0%) | 20 (22.2%) | 68 (36.2%) | |
| Class III | 7 (7.1%) | 38 (42.2%) | 45 (23.9%) | |
| Classes IV-VII | 8 (8.2%) | 10 (11.1%) | 18 (9.6%) | |
| Correction parameters | ||||
| Median proximity to constitutional alignment (°) | 0.1 (−0.8 to 0.8) | 2.9 (−2.0 to 4.3) | 0.7 (−0.9 to 2.9) | <.001 |
| Alignment modification (°) | 2.0 (1.0-3.0) | 4.5 (1.9-6.5) | 2.6 (1.3-4.9) | <.001 |
| Valgus knees | 1.4 (1.0) | 4.5 (3.1) | 3.5 (3.0) | <.001 |
| Varus knees | 2.5 (1.7) | 3.9 (2.9) | 3.2 (2.3) | <.001 |
Values presented as mean (SD), median (IQR), or n (%) as appropriate.