El Chapo Erectile Dysfunction Surgery On the Run

1/15/2016 7:13 AM PST BY TMZ STAFF

0115-chapo-ap-01El Chapo came down from the mountains during his time as a fugitive to undergo erectile dysfunction surgery in Tijuana ... according to a Mexican newspaper.  

Reforma claims sources close to the investigation told its reporter, Chapo received a testicular implant to improve blood flow ... just a stone's throw from the U.S. border. 

The paper claims the surgery required anesthesia and an operating room and involved planting a prosthesis.  

The report claims when Chapo was captured authorities found injectable testosterone, syringes, antibiotics and anti-inflammatories.