Table 2.

Cross-tables depict the results of 21 ultrasound-guided needle releases and 20 ultrasound-guided thread releases using the scoring system in Table 1 (left column)

	Needle	Thread	Total
Ultrasound visibility
1	0	2	2
2	15	7	22
3	6	11	17
Total	21	20	41
Outcome
1	2	0	2
2	4	3	7
3	15	17	32
Total	21	20	41
Injury
1	0	0	0
2	2	5	7
3	19	15	34
Total	21	20	41