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Table 3 Specificity of three commonly used ranges for anatomic limb alignment to predict the acceptable range (neutral ± 3°) for mechanical limb alignment*

From: How accurate is anatomic limb alignment in predicting mechanical limb alignment after total knee arthroplasty?

Parameter Specificity (%) 95 % CI P-value Errors
    5-10° 2-10° Varus Valgus
3-9° 69 63.1-74.1 1.000 <0.001 11 (4) 73 (27)
5-10° 67 60.8-72.0 NA <0.001 44 (16) 46 (17)
2-10° 81 76.0-85.3 NA NA 5 (2) 46 (17)
  1. *Mechanical limb alignment of 270 of 314 (86 %) knees was within neutral ± 3°. Data are presented as counts with proportions in parentheses; the knees were categorized into varus or valgus malalignment using the anatomic limb alignment method even if they were within the acceptable range using the mechanical limb alignment method
  2. Abbreviations: CI confidence interval; NA not applicable