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©The Author(s) 2024.
World J Orthop. Mar 18, 2024; 15(3): 247-256
Published online Mar 18, 2024. doi: 10.5312/wjo.v15.i3.247
Published online Mar 18, 2024. doi: 10.5312/wjo.v15.i3.247
Table 1 Descriptive statistics of the expected, controlled, and radiographic values from measurements in femur and tibia
| The 25th percentile | Median | The 75th percentile | Mean | SD | |
| Femur | |||||
| Varus | |||||
| Expected values | 0 | 0 | 0 | 0.2 | 0.4 |
| Controlled values | 0 | 0 | 1 | 0.4 | 0.6 |
| Radiographic measures | 0 | 0 | 0 | 0.2 | 0.4 |
| Flexion | |||||
| Expected values | 6 | 6 | 7 | 6.2 | 0.9 |
| Controlled values | 5 | 6 | 7 | 6.1 | 1 |
| Radiographic measures | 5 | 6 | 6 | 5.8 | 0.7 |
| Tibia | |||||
| Varus | |||||
| Expected values | 0 | 0 | 0 | 0.1 | 0.3 |
| Controlled values | 0 | 0 | 1 | 0.3 | 0.5 |
| Radiographic measures | 0 | 0 | 0 | 0 | 0 |
| Posterior slope | |||||
| Expected values | 5 | 5 | 6 | 5.4 | 1 |
| Controlled values | 5 | 5.5 | 6 | 5.7 | 0.9 |
| Radiographic measures | 5 | 5 | 6 | 5.4 | 0.8 |
Table 2 Descriptive statistics of the difference of the controlled and radiographic values from the expected values from measurements in femur and tibia
| Minimum | 25th percentile | Median | 75th percentile | Maximum | |
| Femur | |||||
| Varus (degrees) | |||||
| Controlled values | -1.00 | -1.00 | 0.00 | 0.00 | 1.00 |
| Radiographic measures | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| Flexion (degrees) | |||||
| Controlled values | -1.00 | 0.00 | 0.00 | 0.00 | 1.00 |
| Radiographic measures | -1.00 | 0.00 | 0.00 | 1.00 | 1.00 |
| Tibia | |||||
| Varus (degrees) | |||||
| Controlled values | -1.00 | -1.00 | 0.00 | 0.00 | 1.00 |
| Radiographic measures | 0.00 | 0.00 | 0.00 | 0.00 | 1.00 |
| Posterior slope (degrees) | |||||
| Controlled values | -2.00 | 0.00 | 0.00 | 0.00 | 1.00 |
| Radiographic measures | -1.00 | 0.00 | 0.00 | 0.00 | 1.00 |
Table 3 Concordance correlation coefficient (95%CI) and 95% Limits of agreement of expected values with controlled values and radiographic measurements
| Mean (SD) | CCC (95%CI) | 95% LOA | Number of differences out of the LOA | |
| Femur | ||||
| Varus (degrees) | ||||
| Controlled values | -0.20 (0.61) | 0.25 (-0.06, 0.56) | (-1.40, 1.00) | 3 |
| Radiographic measures | 0.00 (0.00) | 1.00 (1.00, 1.00) | - | - |
| Flexion (degrees) | ||||
| Controlled values | 0.03 (0.56) | 0.83 (0.71, 0.94) | (-1.06, 1.10) | 0 |
| Radiographic measures | 0.33 (0.61) | 0.66 (0.48, 0.84) | (-0.86, 1.52) | 2 |
| Tibia | ||||
| Varus (degrees) | ||||
| Controlled values | -0.23 (0.50) | 0.31 (0.06, 0.56) | (-1.22, 0.76) | 1 |
| Radiographic measures | 0.10 (0.31) | - | (-0.50, 0.70) | 3 |
| Posterior slope (degrees) | ||||
| Controlled values | -0.22 (0.63) | 0.75 (0.59, 0.91) | (-1.46, 0.99) | 3 |
| Radiographic measures | 0.03 (0.41) | 0.89 (0.82, 0.95) | (-0.78, 0.84) | 5 |
- Citation: Sakellariou E, Alevrogiannis P, Alevrogianni F, Galanis A, Vavourakis M, Karampinas P, Gavriil P, Vlamis J, Alevrogiannis S. Single-center experience with Knee+™ augmented reality navigation system in primary total knee arthroplasty. World J Orthop 2024; 15(3): 247-256
- URL: https://www.wjgnet.com/2218-5836/full/v15/i3/247.htm
- DOI: https://dx.doi.org/10.5312/wjo.v15.i3.247