Table 2. Summary of EUS applications for skeletal muscle.

Article	Correlation with	Area examined	Number of cases	Results regarding EUS
Niitsu et al, 2011 [23]	Durometer	Elbow flexor muscles	Six normal volunteers	Significant muscle hardening after exercise
				EUS showed similar changes with durometer
Ariji et al, 2009 [24]	None	Masseter muscle	16 normal volunteers	Masseter stiffness index different between sexes and healthy and abnormal muscles
			Two patients with temporomandibular joint dysfunction
Detorakis et al, 2010 [25]	None	Ocular rectus muscle	Five eyes with loss of vision	Differences in muscle stiffness in various gaze positions
Botar-Jid et al, 2010 [26]	Serum markers	Thigh, arm and leg muscles	24 patients with inflammatory myositis	EUS changes in the affected muscles
	Clinical exam			Correlation with serum markers
Drakonaki and Allen, 2010 [27]	Conventional ultrasound	Thigh muscles	Case study	Good correlation with ultrasound and MRI findings
	MRI		One patient with Bethlem myopathy and one normal volunteer
Sikdar et al, 2009 [28]	Conventional ultrasound, clinical exam	Trapezius muscle	Nine patients with myofascial trigger points	Good correlation with clinical exam and ultrasound
Vasilescu et al, 2010 [29]	Conventional ultrasound, clinical exam	Upper and lower limb muscles	Seven children with muscle spasticity	EUS established the site of botulinum toxin injection

EUS, ultrasound elastography.