The quality of the studies was assessed, and meta-analysis was performed using the Cochrane Collaboration's REVMAN 5.1 software.



REVMAN
We searched PubMed, Embase, and the Cochrane databases for studies comparing locking plate and intramedullary nail treatment of displaced two-, three-, or four-part proximal humeral fractures. 
PubMed
We searched PubMed, Embase, and the Cochrane databases for studies comparing locking plate and intramedullary nail treatment of displaced two-, three-, or four-part proximal humeral fractures. 
Embase
We searched PubMed, Embase, and the Cochrane databases for studies comparing locking plate and intramedullary nail treatment of displaced two-, three-, or four-part proximal humeral fractures. 
Cochrane databases