Fluoroscopy-guided direct anterior approach total hip arthroplasty provides more accurate component positions in the supine position than in the lateral position

Table 5 Mean, standard deviation for femoral offset difference, global offset difference, and Leg length discrepancy

Variables	Intraoperative fluoroscopy	Postoperative standing AP X-ray	P value
S-DAA
Femoral offset difference(mm) Global offset difference(mm) Leg length discrepancy(mm)	2.6 ± 0.60 1.2 ± 0.50 2.2 ± 0.45	2.4 ± 0.69 1.1 ± 0.46 2.1 ± 0.42	0.399^a 0.433^a 0.509^b
L-DAA
Femoral offset difference(mm) Global offset difference(mm) Leg length discrepancy(mm)	2.7 ± 0.48 1.3 ± 0.40 4.8 ± 0.46	3.1 ± 0.47 1.56 ± 0.51 4.3 ± 0.43	＜0.001^a 0.008^a ＜0.001^b

S-DAA direct anterior approach in the supine position, L-DAA direct anterior approach in the lateral position
^a Student’s t test
^b Mann–Whitney U test

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