Screw backout
Progressive loosening and migration of orthopedic screws from their original position in bone.
Full Definition
Screw backout refers to the progressive loosening and outward migration of orthopedic screws from their intended position within bone, representing a form of hardware failure. This complication can result from inadequate initial fixation, poor bone quality, excessive loading, infection, or loss of reduction. Screw backout may lead to loss of fracture stability, soft tissue irritation, neurovascular injury, or complete construct failure. Recognition of early screw backout on radiographic follow-up is important for determining the need for revision surgery or hardware removal before serious complications occur.
Usage
Usage note: Distinguished from initial screw pullout by its progressive nature over time.
In Context
- "Serial radiographs demonstrated progressive screw backout requiring revision surgery." — Follow-up clinic documentation
- "The patient developed symptomatic screw backout with skin irritation overlying the prominent hardware." — Complication assessment