Table 3.

Suggested needle gauge and joint volume

Joint	Aspiration (needle)	Injection (needle)	Volume mixture (arthrography vs therapy)
Hip	18 G, 3.5–6.0 inch	20–22 G, 3.5–6.0 inch	10–12 ml	4–5 ml
Knee	18 G, 1.5–3.5 inch	20–22 G, 1.5–3.5 inch	20–40 ml	4–5 ml
Tibiotalar	18 G, 1.5–3.5 inch	20–22 G, 1.5–3.5 inch	2–4 ml	2–3 ml
Subtalar	18 G, 1.5 inch	20–22 G, 1.5 inch	N/A	2–3 ml
Smaller joints of the foot	20–22 G, 1.5 inch	23–25 G, 0.5–1.5 inch	N/A	0.5–1.0 ml