Table 1.

Average ± standard deviation for gap width measures for the US, mFluoro-Medial and mFluoro-Distal measures in the unloaded and maximally loaded conditions, as well as the average change with load.

		Location	Method	Unloaded	Max. Loaded	Change
Current Study	US	Medial	Ultrasound	8.7 ± 2.4 mm	10.7 ± 2.2 mm	2.1 ± 0.7 mm
	mFluoro-Medial	Medial	Mimicked Fluoroscopy	9.0 ± 2.5 mm	12.4 ± 2.5 mm	3.4 ± 0.6 mm
	mFluoro-Distal	Distal	Mimicked Fluoroscopy	2.1 ± 1.9 mm	5.2 ± 2.4 mm	3.0 ± 0.9 mm
Literature	Kleinbaum and Blankstein [33]	Medial	Ultrasound	6.7 ± 0.7 mm	9.6 ± 0.7 mm	3.0 ± 0.5 mm
	Whelan et al. [25]	Medial	Fluoroscopy	–	10.9 ± 2.1 mm	–
	LaPrade et al. [24]	Distal	Fluoroscopy	–	5.1 ± 2.1 mm	–

Also included in the table are data from the literature using similar methods. The location column refers to whether data points were identified at the most medial or most distal aspect of the femur. Some differences between the results from the current study and those in the literature may be due to differences in loading. LaPrade et al. [24] reported that gap width was measured during the application of a 10 Nm load, as in our study, whereas Kleinbaum and Blankstein [33] and Whelan et al. [25] either did not control load or did not report it