Table 2.
Clinical and radiographic characteristics before and after UKA
| Variables | Pre-operative [SD] | Final follow-up [SD] | P valuea |
| Knee Society Scoring System | |||
| Mean objective score (points) | 49 [9] | 95 [4] | < 0.01 |
| Mean functional score (points) | 48 [10] | 92 [7] | < 0.01 |
| Radiographic Characteristics | |||
| Mean femoral angle (degrees) | 97 [2] | 97 [3] | < 0.01 |
| Mean tibial angle (degrees) | 84 [2] | 84 [2] | 0.81 |
| Mean medial joint space (millimeters) | 1.0 [1.0] | 2.9 [1.6] | < 0.01 |
| Mean lateral joint space (millimeters) | 6.0 [2.0] | 5.7 [1.9] | 0.19 |
| Mean patellar medial joint space (millimeters) | 2.6 [1.6] | 2.7 [2.0] | 0.98 |
| Mean patellar central joint space (millimeters) | 3.6 [2.1] | 3.2 [2.2] | 0.04 |
| Mean patellar lateral joint space (millimeters) | 2.7 [1.9] | 2.3 [1.8] | 0.07 |
| Presence of patellar osteophytes (percent of patients) | 48 | 38 | 0.31 |
| Alpha angle (degrees) | --- | 87 [4] | --- |
| Beta angle (degrees) | --- | 82 [6] | --- |
SD = standard deviation
ap values were calculated based on Wilcoxon matched-pairs signed-ranks tests for continuous variables and chi-squared tests for categorical variables