Treatment of posterior interosseous nerve entrapment syndrome with ultrasound-guided hydrodissection: A case report

Table 1 Comparisons of muscle strength, motor conduction amplitude, and electromyography findings before and after treatment

Examination	Location	Time
		Before treatment	1 wk after treatment	3 mo after treatment
Manual muscle test (grade)	Extensor digitorum	2	3	4+
	Supinator muscle	4	4	5-
Motor conduction amplitude	Radial nerve at the forearm (mV)	4.55	-	6
	Radial nerve at the elbow (mV)	2.3	-	5.06
	Superficial radial nerve (mV)	27.4	-	-
Spontaneous potential on electromyogram	Extensor indicis	DP (1+)	-	0
	Extensor digitorum communis muscle	DP (2+)	-	0
	Extensor carpi radialis muscle	0	-	0

DP: Deep potential.