Table 2
Pre- and post-operative data on the femoral prostheses’ subgroups (Groups A.1 and B.1). 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 femoral prostheses’ subgroups. Complications and revisions are also presented. The statistically significant values are depicted in bold.
| Preoperative evaluation |
|||
|---|---|---|---|
| Group A.1 (cementless femoral implants) (N = 302) | Group B.1 (cemented femoral implants) (N = 91) | P-value | |
| Demographics | |||
| Age (years) | 69 (IQR 63.75 to 74) | 71 (IQR 64.5 to 74.5) | 0.44 |
| BMI (kg/m2) | 28.07 (IQR 25.33 to 31.64) | 29.03 (IQR 24.91 to 31.83) | 0.66 |
| Female gender | 60.56% | 63.74% | 0.59 |
| Implant design | |||
| CR | 43.05% | 4.4% | <0.0001 |
| Preoperative clinical evaluation | |||
| KSS-knee | 66.5 (IQR 57 to 76) | 60 (IQR 53 to 75) | 0.1 |
| KSS-function | 70 (IQR 60 to 80) | 70 (IQR 53.75 to 75.75) | 0.17 |
| Preoperative radiographic evaluation | |||
| HKA | 175° (IQR 172 to 179) | 177° (IQR 170.25 to 184) | 0.21 |
| LDFA | 91° (IQR 90 to 93) | 91° (IQR 88.25 to 93) | 0.76 |
| MPTA | 87° (IQR 85 to 89) | 88° (IQR 84 to 90) | 0.27 |
| Robotic alignment evaluation | |||
| Preoperative Mako alignment (varus) | 6° (IQR 2 to 8) | 6° (IQR 0.25 to 9) | 0.54 |
| Implant positioning (Mako data) | |||
| Femoral valgus | 0.9° (IQR −0.23 to 2) | 0.6° (IQR −0.1 to 2) | 0.71 |
| Femoral ER | 0.1° (IQR −1.3 to 1.33) | 0.2° (IQR −1 to 1.1) | 0.71 |
| Femoral flexion | 7.8° (IQR 5.5 to 9) | 7.5° (IQR 6 to 9) | 0.88 |
|
|
Postoperative evaluation |
||
| Postoperative clinical evaluation | |||
| KSS-knee | 95 (IQR 90 to 100) | 95 (IQR 90 to 100) | 0.38 |
| KSS-function | 90 (IQR 90 to 100) | 95 (IQR 88.5 to 100) | 0.63 |
| FJS | 84 (IQR 67 to 92) | 89 (IQR 67 to 98) | 0.08 |
| Postoperative radiographic assessment | |||
| HKA | 178.85° (IQR 176 to 180) | 179° (IQR 177 to 182) | 0.44 |
| LDFA | 91° (IQR 89 to 92) | 90° (IQR 88.3 to 91) | 0.02 |
| MPTA | 88° (IQR 86.5 to 89.3) | 89° (IQR 87 to 90) | 0.06 |
| Robotic alignment evaluation | |||
| Postoperative Mako alignment (varus) | 3° (IQR 1 to 5) | 2° (IQR 0 to 4.25) | 0.04 |
| Complications | |||
| Total complications | 11.26% (34 cases) | 10.99% (10 cases) | 0.94 |
| Major complications | 0.99% (3 cases of DAIR) | 3.3% (2 cases of DAIR and 1 postoperative fracture) | 0.12 |
| Revisions (aseptic loosening) | – | – | 0.07 |
| MUA | 4.64% (14 cases) | 5.49% (5 cases) | 0.74 |
| Medial condyle necrosis | – | 1.1% (1 case) | 0.07 |
| Hematoma | 5.3% (16 cases) | – | 0.03 |
| Infections-DAIR | 0.99% (3 cases) | 2.2% (2 cases) | 0.37 |
| Intra- and Post-operative femoral fractures | 0.33% (1 case) | 2.2% (2 cases) | 0.07 |
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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