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Table 2 Comparison of the femoral component rotation

From: Rotational alignment of femoral component with different methods in total knee arthroplasty: a randomized, controlled trial

  Measured resection (n = 51) Tensor (n = 50) Block (n = 52) p-value
Femoral component rotationc,d (degree) Mean −1.79 −0.43 −2.63 0.0001a
Range −6.9 ~ 3.4 −5.5 ~ 6.1 −10.8 ~ 1.5
95% confidence interval −2.43 ~ −1.16 −1.10 ~ 0.24 −3.32 ~ −1.93
Outliere Total 18 (35%) 8 (16%) 21 (40%) 0.020b
>3° IR 16 5 21  
>3° ER 2 3 0  
  1. Comparison between Measured resection group and Tensor group; p-value 0.0063a Comparison between Tensor group and Block group; p-value <0.0001a Comparison between Measured resection group and Block group; p-value 0.0691a
  2. Femoral component rotation: angle between clinical transepicondylar axis and posterior condylar axis of femoral component
  3. Outlier: Femoral component rotation with more than 3° of external rotation or internal rotation
  4. Abbreviations: IR internal rotation, ER external rotation
  5. aMixed model for adjustment of auto-correlation
  6. bChi-square test
  7. cSubgroup analysis of femoral component rotation angle among groups
  8. d+ : external rotation, − : internal rotation
  9. eThe values are given as the number of cases with percentage in parenthesis