Total hip arthroplasty through the direct anterior approach with and without the use of a traction table: a matched-control, retrospective, single-surgeon study

Table 3 Radiologic measurements

	Without table (n = 75)	With table (n = 75)	Significance (p value)
Acetabular inclination (°)	41.83 (4.8)	43.68 (4.3)	0.11
Within the “safe zone”	73 (97.3%)	70 (93.3%)
Acetabular anteversion (°)	29.56 (6)	32 (7)	0.41
Within the “safe zone”	14 (18.6%)	14 (18.6%)
Vertical center of rotation (mm)	-1.80 (4.4)	-2.48 (5)	0.38
Horizontal center of rotation (mm)	-1.5 (3.9)	-2.3 mm (4.5)	0.36
Leg length discrepancy (mm)	2.4 (2)	3.67 (3.1)	p ≤ 0.05
- Outliers > 5 mm	8 (10%)	15 (20%)
- Outliers > 10 mm	0 (0%)	2 (2.66%)

Values were given as mean and standard deviation
“Safe zone” for acetabular inclination and anteversion was set at 30–50° and 5–25°, respectively, as described by Lewinnek et al. [25]. A positive leg length discrepancy value was used when the operated leg was longer than the contralateral side

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