Table 1.
Patient demographics and radiographic measurements
| Demographics and measurements | Navigated (SD; range) | Nonnavigated (SD; range) | p Value |
|---|---|---|---|
| Number of hips | 51 | 88 | |
| Gender | |||
| Male | 70.6% (n = 36) | 68.2% (n = 60) | |
| Female | 29.4% (n = 15) | 31.8% (n = 28) | |
| Mean age (years) | 48 (8.8; range, 18–64) | 48 (9.6; range, 16–77) | 0.949 |
| Average height (meters) | 1.73 (0.09); range, 1.52–1.91) | 1.73 (0.08; range, 1.52–1.95) | 0.801 |
| Average weight (kg) | 79.3 (12.8; range, 56–104) | 82 (18.3; range, 48–140) | 0.346 |
| Body mass index (kg/m2) | 26.5 (3.2; range, 18.2–32.5) | 27 (5.2; range, 17.6–43.7) | 0.210 |
| Blood loss (mL) | 445 (182; range, 200–1000) | 516 (296; range, 100–1600) | 0.118 |
| Femoral component diameter (mm) | 49 (3.5; range, 40–56) | 49 (4.1; range, 42–60) | 0.539 |
| Operative time (minutes) | 111 (16.1; range, 80–150) | 105 (17.0; range, 60–185) | 0.048 |
| Native femoral neck shaft angle (degrees) | 132 (7.3; range, 120–153) | 131 (5.8; range, 116–144) | 0.284 |
| Planned neck-shaft angle (degrees) | 138 (4.1; range, 131–152) | 137(3.4; range, 128–146) | 0.055 |
| Postoperative stem-shaft angle (degrees) | 139 (4.5; range, 130–152) | 139 (5.9; range, 127–155) | 0.719 |
| Difference between postoperative stem-shaft angle and native neck-shaft angle (degrees) | 6.3 (4.5, −6.0–18.0) | 7.8 (0.7; range, −7.0–2.0) | 0.129 |
| Mean postoperative stem-shaft angle minus planned stem-shaft angle (degrees) | 0.4 (1.6; range, −4.0–3.0) | 2.1 (5.3; range, −8.0–16.0) | 0.005 |
| Mean absolute postoperative neck-shaft angle minus planned neck-shaft angle (degrees) | 1.3 (0.9; range, 0–4) | 4.4 (3.6; range, 0–16) | ≤ 0.001 |