Table 2 Overall Learning Curve
From: Learning curve of Persona Partial Knee (PPK) arthroplasty: a clinical trial
|  | Moving average ± SD | Mann–Kendall trend test Value (p-value) | Learning curve | ||||
|---|---|---|---|---|---|---|---|
1st patient group | 25th patient group | 50th patient group | 75th patient group | 106th patient group | Â | Â | |
Surgical time | 47.8 ± 9.42 | 49.3 ± 9.85 | 50.4 ± 9.58 | 48.3 ± 9.17 | 42.6 ± 10.8 | -0.15 (p = 0.01) | The learning curve stabilized after the 94th patient group |
Tibial angle | -2.85 ± 2.03 | -2.75 ± 2.71 | -0.65 ± 1.27 | -0.85 ± 1.27 | -0.6 ± 0.94 | 0.30 (p < 0.001) | The learning curve stabilized after the 47th patient group |
Femoral angle | 0.60 ± 3.47 | -0.60 ± 3.15 | 0.55 ± 2.52 | 0.05 ± 1.32 | -0.45 ± 1.64 | -0.05 (p = 0.4) | No learning curve |
Tibial slope | 3.90 ± 2.51 | 2.50 ± 2.80 | 4.75 ± 1.25 | 5.3 ± 1.34 | 5.50 ± 0.83 | 0.35 (p < 0.001) | The learning curve stabilized after the 54th patient group |
Anterior protrusion | 0.35 ± 0.59 | -0.05 ± 0.61 | 0 ± 0.32 | -0.1 ± 0.45 | 0 ± 0.0 | -0.21 (p = 0.003) | The learning curve stabilized after the 29th patient group |
Posterior protrusion | -0.70 ± 1.13 | -0.35 ± 0.99 | 0.10 ± 0.45 | -0.05 ± 0.51 | -0.10 ± 0.31 | 0.23 (p < 0.001) | The learning curve stabilized after the 51th patient group |
Medial protrusion | 0.0 ± 0.86 | -0.15 ± 1.04 | 0.0 ± 0.32 | 0.10 ± 0.64 | -0.25 ± 0.72 | -0.06 (p = 0.05) | No learning curve |
Bearing (thickness) | 8.55 ± 0.76 | 8.40 ± 0.60 | 8.55 ± 0.61 | 8.00 ± 0.00 | 8.5 ± 1.05 | -0.09 (p = 0.2) | No learning curve |