From: Extramedullary versus intramedullary tibial cutting guides in megaprosthetic total knee replacement

Postoperative measurements in coronal
view
| |||

Extramedullary | Intramedullary | Significance | |

Mean TCA1 +/− S.D. in degrees | −1.18 +/− 2.40 | −0.34 +/− 2.31 | p = 0.06 |

Number of X-rays within optimal range (percentage) | 35 (54) | 18 (67) | p = 0.25 |

Number of X-rays within valgus alignment (percentage) | 16 (25) | 12 (44) | p = 0.07 |

Mean error Δ in degrees | 0.05 | 0.04 | p = 0.65 |

Number of X-rays tends to 20^{0} leg rotation (percentage)
| 19 (29) | 9 (33) | p = 0.70 |

Postoperative measurements in sagittal
view
| |||

Extramedullary | Intramedullary | Significance | |

Mean TCA2 +/− S.D. in degrees | 2.09 +/− 2.40 | 0.50 +/− 3.28 | p = 0.01 |

Number of X-rays within optimal range (percentage) | 51 (78) | 17 (63) | p = 0.16 |

Number of X-rays within posterior slope (percentage) | 57 (88) | 18 (67) | p = 0.03 |

Mean error Δ in degrees | 0.07 | 0.05 | p = 0.46 |

Number of X-rays tends to 20^{0} leg rotation (percentage)
| 25 (38) | 13 (48) | p = 0.38 |