stress riser
A point of stress concentration in bone or implant that increases the risk of failure at that location.
Full Definition
A stress riser is any geometric discontinuity or material change that concentrates mechanical stress, creating a potential failure point. In orthopedic trauma, stress risers can occur at screw holes, plate ends, or areas where implant stiffness changes abruptly relative to bone. Understanding stress risers is crucial for implant design and surgical technique, as they represent the most likely locations for subsequent fracture or implant failure. Common stress risers include the junction between plated and unplated bone, unfilled screw holes, and sharp geometric transitions in implant design. Recognition of potential stress risers guides surgical decision-making and implant selection.
Usage
Usage note: Identify and address potential stress risers in surgical planning and implant selection discussions.
In Context
- "The empty screw hole created a stress riser that led to fracture at the plate-bone junction." — Failure analysis report
- "Gradual implant stiffness transitions help minimize stress risers in modern plate designs." — Biomechanical engineering study