Reliability of a simple fluoroscopic image to assess leg length discrepancy during direct anterior approach total hip arthroplasty

Table 1 Comparison of fluoroscopic and x-ray leg length discrepancy

	Fluoroscopic				X-ray
	Mean	SD	Min	Max	Mean	SD	Min	Max	P value
LLD by Teardrops	2.89	2.07	0.0	11.0	2.45	2.11	0.0	12.5	0.007
LLD by Ischiums	3.93	2.95	0.0	16.0	3.27	3.01	0.0	15.5	< 0.001

Summary descriptive statistics including mean, SD, minimum and maximum values for leg length discrepancy as obtained by two independent observers. LLD: Leg length discrepancy.

Table 2 Absolute difference in leg length discrepancy

	Teardrop				Ischium
	Mean	SD	Min	Max	Mean	SD	Min	Max	P value
Fluoro-x-ray difference	2.17	1.7	0.0	9.50	2.63	1.64	0.0	9.5	< 0.001

Absolute difference in mean leg length discrepancy between fluoroscopy and x-ray obtained measurements using radiographic teardrop or ischium reference points. All measurements were obtained by two independent observers.