Table 2.

Correlations between muscle strength testing and imaging outcomes of the corresponding muscle groups

Clinical outcome	Muscle	MRI fat fraction		Ultrasound z-score
		CC	p value	CC	p value
MMT dorsiflexors	Tibialis anterior
	Right	− 0.882	0.01	− 0.772	0.01
	Left	− 0.886	0.01	− 0.729	0.01
MMT plantar flexors	Gastrocnemius medialis
	Right	− 0.323	0.16	− 0.580	0.01
	Left	− 0.378	0.08	− 0.569	0.01
MMT knee extensors	Vastus lateralis
	Right	− 0.823	0.01	− 0.543	0.01
	Left	− 0.828	0.01	− 0.569	0.01
	Rectus femoris
	Right	− 0.500	0.02	− 0.335	0.14
	Left	− 0.535	0.01	− 0.230	0.30
QMT knee extensors	Vastus lateralis
	Right	− 0.603	0.01	− 0.492	0.03
	Left	− 0.522	0.02	− 0.232	0.32
	Rectus femoris
	Right	− 0.385	0.08	− 0.289	0.23
	Left	− 0.123	0.57	− 0.159	0.46

p values corrected for multiple testing

MMT: manual muscle testing; QMT: quantitative muscle testing; CC: correlation coefficient