ORIF is an abbreviation for 'open reduction and internal fixation', and refers to bone fractures.
Fixing a bone fracture with internal 'hardware'
Open reduction and internal fixation refers to broken bones (fractures) where the surgeon cuts into the joint surgically to align the broken bones and then uses metal surgical plates or other means (loosely referred to as 'hardware') to hold the bones in a better position so that they can heal properly.
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Treatment strategy for tibial plateau fractures: an update. Prat-Fabregat S and Camacho-Carrasco P. EFORT Open Rev. 2016 May; 1(5): 225–232.
ORIF Patella Fracture With a Tension Band Construct. Blum L and Hake M. J Orthop Trauma. 2017 Aug;31 Suppl 3:S8-S9. doi: 10.1097/BOT.0000000000000891.