 If diagnosis is delayed, reconstructive surgery is needed and complications are much more common and results poorer.In adults, the healing is slower and results usually not as good.Complications of ORIF surgery for Monteggia fractures can include non-union, malunion, nerve palsy and damage, muscle damage, arthritis, tendonitis, infection, stiffness and loss of range of motion, compartment syndrome, audible popping or snapping, deformity, and chronic pain associated with surgical hardware such as pins, screws, and plates.