Table 1.

The Full search syntax used to identify studies.

Database	Search terms	Hits
PubMed	(PRP OR “Platelet rich plasma” [tw] OR “Platelet-rich Plasma” [tw] OR “Platelet-Rich Plasma” [Mesh]) AND (“Frozen shoulder”[tw] OR “Adhesive Capsul*" [tw] OR “Periarthritis Shoulder” [tw])	32
Medline	(PRP OR “Platelet rich plasma” OR “Platelet-rich Plasma” OR “Platelet-Rich Plasma" [Mesh]) AND (“Frozen shoulder” OR “Adhesive Capsul*" OR “Periarthritis Shoulder”)	26
CINHAL	(PRP OR “Platelet rich plasma” OR “Platelet-rich Plasma” OR “Platelet-Rich Plasma" [Mesh]) AND (“Frozen shoulder” OR “Adhesive Capsul*" OR “Periarthritis Shoulder”)	15
EMBASE	((PRP or “Platelet rich plasma” or “Platelet-rich Plasma”) and (“Frozen shoulder” or “Adhesive Capsul*" or “Periarthritis Shoulder”)).mp.	38
Cochrane	#1 MeSH descriptor: [Platelet-Rich Plasma] explode all trees #2 (PRP) OR (“platelet-rich plasma”) #3 (“Frozen Shoulder”) OR (“adhesive capsul*") OR (“Periarthritis Shoulder”) (#1 OR #2) AND #3	29