Table 3.
Evidence for implant accuracy
| Component accuracy | ||
|---|---|---|
| Kayani et al. [20] | 2019 | [Accuracy in achieving the planned implant positions compared to conventional jig based TKA] |
| Mechanical alignment (degrees), mean (SD) | ||
| mTKA 3.2 ± 1.2 vs RATKA 1.5 ± 0.9, p < 0.001 | ||
| PCOR | ||
| mTKA 0.3 ± 0.1 vs RATKA 0.2 ± 0.1, n.s | ||
| Posterior slope | ||
| mTKA 3.4 ± 1.1 vs RATKA 1.4 ± 0.6, p < 0.001 | ||
| Joint line | ||
| mTKA 2.9 ± 1.4 vs RATKA 1.0 ± 0.6, p < 0.001 | ||
| Femur coronal | ||
| mTKA 4.1 ± 1.1 vs RATKA 1.0 ± 0.4, p < 0.001 | ||
| Femur sagittal | ||
| mTKA 4.2 ± 0.8 vs RATKA 2.1 ± 0.7, p < 0.001 | ||
| Tibia coronal | ||
| mTKA 3.6 ± 0.8 vs RATKA 1.0 ± 0.5, p < 0.001 | ||
| Tibia sagittal | ||
| mTKA 3.9 ± 1.0 vs RATKA 2.0 ± 0.6, p < 0.001 | ||
| Mahoney et al. [28] | 2020 | Coronal positions measured via CT (mean ± SD) |
| Femoral components | ||
| mTKA 0.1 (± 1.6) varus vs RATKA 0.0 (± 1.4) varus, p = 0.506 | ||
| Tibial components | ||
| mTKA 1.9 (± 2.4) varus vs RATKA 0.9 (± 2.0) varus, p = 0.005 | ||
| Femoral component external rotation relative to the transepicondylar axis | ||
| mTKA 1.1 ± 2.3 vs RATKA 0.5 ± 2.3 degrees, (p = 0.195) | ||
| Tibial slopes | ||
| mTKA 3.7 ± 3.0 vs 3.2 ± 1.8 degrees, (p = 0.291) | ||
| Naziri et al. [36] | 2019 | Postoperative alignment was within + 3.0° of the mechanical axis for all patients in both RATKA and mTKA groups |
| Savov et al. [44] | 2019 | Limb alignment and restoration of the joint line |
| mTKA no difference from RATKA | ||
| RATKA deviation limb alignment to the intraoperative plan, mean = 2° (± 1.1) | ||
| RATKA deviation of the medial proximal tibial (mPTA) and distal lateral femoral angle (dLFA) = 1° (± 0.9) for both | ||
| Sultan et al. [51] | 2019 | Postoperative PCOR, mean (SD) |
| mTKA 0.53 (± 0.3) vs RATKA 0.49 (± 0.21), p = 0.024 | ||
| Difference between pre- and postoperative PCOR, mean | ||
| mTKA 0.03 vs RATKA 0.004, p = 0.01 | ||
| Postoperative ISI outside of the normal range (0.8–0.12) | ||
| mTKA 12 vs RATKA 4 | ||
| Tucking et al. [52] | 2020 | Postoperative PCOR, mean (SD) |
| mTKA 0.47 (± 0.05) vs RATKA 0.51 (± 0.05), p = 0.006) | ||
| PCOR (difference between pre- and postoperative), mean | ||
| mTKA 0.059 vs RATKA -0.017, p = 0.001 | ||
| Relative deviation of PCOR, mean (SD) | ||
| mTKA 12.03% (± 9.1) vs RATKA 3.9% (± 4.5) | ||
PCOR Posterior condylar offset ratio, ISI Insall-Salvati Index, mTKA manual total knee arthroplasty, RATKA Robotic-arm assisted total knee arthroplasty