Table 1. Databases used for collecting articles with search strategies and appropriate filters.

MeSH: Medical Subject Headings; PRP: platelet-rich plasma

Database used	Search strategy	Number of research articles retrieved
PubMed	({({({["platelet-rich plasma" [All Fields] OR "platelet-rich plasma" [All Fields] OR "prp" [All Fields])} AND ("hyaluronic acid" [Supplementary Concept] OR "hyaluronic acid" [All Fields] OR "hyaluronic acid" [MeSH Terms] OR {"hyaluronic" [All Fields] AND "acid" [All Fields]})) OR ("hyaluronate" [All Fields] OR "hyaluronates" [All Fields] OR "hyaluronic" [All Fields])} AND ("osteoarthritis" [MeSH Terms] OR "osteoarthritis" [All Fields] OR "osteoarthritides" [All Fields]) OR ("arthritis" [MeSH Terms] OR "arthritis" [All Fields] OR "arthritides" [All Fields] OR "polyarthritides" [All Fields]) AND ("hip" [MeSH Terms] OR "hip" [All Fields])] OR ("hip joint" [MeSH Terms] OR ("hip" [All Fields] AND "joint" [All Fields]) OR "hip joint" [All Fields]) AND (y_10 [Filter]) AND (randomized controlled trial [Filter]})	1290
Google Scholar	Allintitle: platelet-rich plasma hyaluronic acid hip osteoarthritis	20
Cochrane Library	Platelet-rich plasma AND hyaluronic acid AND hip osteoarthritis	20
	PRP AND hyaluronic acid AND hip osteoarthritis	17