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

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

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

Group A: Knees undergoing conventional TKA.
Group B: Knees undergoing CN-TKA.
AA = anatomic axis, MA = mechanical axis.
The values are given as the mean with the range in parentheses or (%) where appropriate.
P values for between-group comparison were determined by chi-square tests for categorical variables, and the t test for continuous variables.
*Statistically significant (p value <0.05).

ISSN: 1471-2474