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Table 4 Comparison of the radiographic results in octogenarians who underwent primary or revision total knee arthroplasty

From: Mid-term lifetime survivals of octogenarians following primary and revision total knee arthroplasties were satisfactory: a retrospective single center study in contemporary period

   Primary Revision p value
Mechanical axis (degrees) Preoperative Varus 12.3 ± 7.3 (varus 27.3 – valgus 15.1) Varus 8.8 ± 9.7 (varus 22.8 – valgus 9.8) 0.045
Postoperative Varus 1.0 ± 3.3 (varus 5.3 –valgus 4.7) Varus 2.8 ± 4.3 (varus 7.4 – valgus 5.2) 0.003
Position of components (degrees) α angle 95.6 ± 1.9 (92.6–99.8) 95.7 ± 2.9 (92.1–99.9) 0.938
β angle 90.8 ± 2.0 (86.3–93.7) 90.5 ± 1.7 (86.6–93.9) 0.316
γ angle 4.2 ± 3.3 (− 2.5–7.9) 3.2 ± 4.1 (− 2.3–7.2) 0.096
δ angle 86.2 ± 3.1 (84.5–89.7) 86.1 ± 3.7 (81.5–90.2) 0.923
  1. Data are presented as the mean ± standard deviation (range)