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Table 2 Perioperative and radiographic data of the conventional and CN-TKA groups

From: Comparison of computer-navigated and conventional total knee arthroplasty in patients with Ranawat type-II valgus deformity: medium-term clinical and radiological results

Parameters Group A Group B p-value
  N = 36 N = 34  
Perioperative data
Difference of perioperative hemoglobin level (g/dL) 1.5 ( 0.6–2.7) 1.3 (0.4–2.1) 0.448
Tourniquet time (minutes) 75 (40–149) 79 (58–117) 0.532
Lateral retinaculum for patellar tracking 13 (36.1%) 2 (5.9%) 0.001*
Bone grafting 7 (19.4%) 11 (32.4%) 0. 086
Radiographic data
Preoperative AA (deg) 195.4° (191°−204°) 194.3° (192°−202°) 0.202
Postoperative MA (deg) 179.9° (176°−184°) 180.4° (178°−181°) 0.307
Preoperative congruent angle (deg) 12.6° (1°−39° 11.5° (2°−38°) 0.716
Postoperative patellar tilting angle (deg) 2.7 (2°−5°) 2.4° (range, 1°−4°) 0.855
Joint line elevation (mm) 2.24 (−1.9−6.2) 1.33 (−1.3−2.7) 0.020*
Component alignment    
Femoral valgus angle (deg) 95.4° (93°−97°) 94.6° (92°−96°) 0.448
Femoral flexion angle (deg) 3.1° (0°−7°) 2.7° (0°−7°) 0.165
Tibial valgus angle (deg) 90.1° (89°−91°) 89.9° (88°−91°) 0.960
Tibial flexion angle (deg) 86.6° (83°−91°) 87.1° (84°−90°) 0.573
  1. Group A: Knees undergoing conventional TKA.
  2. Group B: Knees undergoing CN-TKA.
  3. AA = anatomic axis, MA = mechanical axis.
  4. The values are given as the mean with the range in parentheses or (%) where appropriate.
  5. P values for between-group comparison were determined by chi-square tests for categorical variables, and the t test for continuous variables.
  6. *Statistically significant (p value <0.05).