Table 3
Pre- and post-operative data on the tibial prostheses’ subgroups (Groups A.2 and B.2). Preoperatively, comparative analysis of the demographics, the implant design, the preoperative clinical, and radiographic evaluation and the final femoral implant positioning. Postoperatively, evaluation of the clinical, radiographic parameters between the two tibial prostheses’ subgroups. Complications and revisions are also presented. The statistically significant values are depicted in bold.
| Preoperative evaluation |
|||
|---|---|---|---|
| Group A.2 (cementless tibial implants) (N = 282) | Group B.2 (cemented tibial implants) (N = 111) | P-value | |
| Demographics | |||
| Age (years) | 70 (IQR 64 to 74) | 69 (IQR 63 to 74) | 0.48 |
| BMI (kg/m2) | 28.32 (IQR 25.47 to 31.65) | 27.68 (IQR 24.86 to 31.25) | 0.27 |
| Female gender | 60.99% | 62.16% | 0.83 |
| Implant design | |||
| CR | 41.49% | 15.3% | <0.0001 |
| Preoperative clinical evaluation | |||
| KSS-knee | 66 (IQR 57 to 74.75) | 64 (IQR 55.5 to 76) | 0.47 |
| KSS-function | 70 (IQR 60 to 80) | 70 (IQR 57.5 to 76.5) | 0.51 |
| Preoperative radiographic evaluation | |||
| HKA | 175° (IQR 172 to 179) | 176° (IQR 169 to 182) | 0.86 |
| LDFA | 91° (IQR 91 to 93) | 92° (IQR 89 to 93) | 0.74 |
| MPTA | 87° (IQR 85 to 89) | 87° (IQR 84 to 89) | 0.97 |
| Robotic alignment evaluation | |||
| Preoperative Mako Alignment (varus) | 6° (IQR 2 to 8) | 6° (IQR 1.25 to 9) | 0.86 |
| Implant positioning (Mako data) | |||
| Tibial varus | 3.5° (IQR 2 to 4.5) | 2.5° (IQR 1 to 4.5) | 0.1 |
| Tibial ER | 0° (IQR 0 to 0) | 0° (IQR 0 to 0) | 0.21 |
| Tibial posterior slope | 1° (IQR 0 to 1) | 0.5° (IQR 0 to 1) | 0.65 |
| Postoperative evaluation |
|||
| Postoperative clinical evaluation | |||
| KSS-knee | 94.5 (IQR 90 to 100) | 95 (IQR 90 to 100) | 0.24 |
| KSS-function | 90 (IQR 90 to 100) | 94 (IQR 88 to 100) | 0.73 |
| FJS | 84 (IQR 67 to 92) | 88 (IQR 67 to 96) | 0.08 |
| Postoperative radiographic assessment | |||
| HKA | 179° (IQR 176 to 180) | 178° (177 to 181) | 0.76 |
| LDFA | 91° (IQR 89.43 to 92) | 90° (IQR 88 to 92) | 0.02 |
| MPTA | 88° (IQR 86.5 to 89) | 89° (IQR 87 to 90) | 0.05 |
| Robotic alignment evaluation | |||
| Postoperative Mako Alignment (varus) | 3 (IQR 1 to 5) | 2 (IQR 0 to 5) | 0.13 |
| Complications | |||
| Total Complications | 11.35% (32 cases) | 8.1% (9 cases) | 0.34 |
| Major complications | 1.42% (3 cases of DAIR and 1 aseptic loosening) | 1.8% (2 cases of DAIR) | 0.78 |
| Revisions (aseptic loosening) | 0.35% (1 case) | – | 0.53 |
| MUA | 3.9% (11 cases) | 5.4% (6 cases) | 0.51 |
| Hematoma | 6.03% (17 cases) | 1.8% (2 cases) | 0.08 |
| Infections-DAIR | 1.06% (3 cases) | 1.8% (2 cases) | 0.56 |
N: number, BMI: body mass index, IQR: Interquartile range, ER: External rotation (Femoral ER with reference to the trans-epicondylar axis, Tibial ER with reference to the Akagi line), KSS: Knee Society Score, HKA: Hip-Knee angle, LDFA: lateral distal femoral angle, MPTA: medial proximal tibial angle.
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