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Electrochemical Corrosion of Metal Implants

Scott P. Patterson1, Richard H. Daffner1 and Robert A. Gallo2

1 Department of Diagnostic Radiology, Allegheny General Hospital, 320 E North Ave., Pittsburgh, PA 15212-4772.
2 Department of Orthopaedic Surgery, Allegheny General Hospital, Pittsburgh, PA 15212-4722.



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  		Fig. 1A. —68-year-old woman with history of breast carcinoma and positive findings on bone scan in right femur. History revealed cerclage wires placed 20 years earlier for femur fracture. Frontal (A) and lateral (B) radiographs show fuzziness of margins of wires indicating electrolytic corrosion. Radionuclide bone scan (C) shows increased tracer activity in left femur. This corresponds to site of corrosion.

 


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  		Fig. 1B. —68-year-old woman with history of breast carcinoma and positive findings on bone scan in right femur. History revealed cerclage wires placed 20 years earlier for femur fracture. Frontal (A) and lateral (B) radiographs show fuzziness of margins of wires indicating electrolytic corrosion. Radionuclide bone scan (C) shows increased tracer activity in left femur. This corresponds to site of corrosion.

 


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  		Fig. 1C. —68-year-old woman with history of breast carcinoma and positive findings on bone scan in right femur. History revealed cerclage wires placed 20 years earlier for femur fracture. Frontal (A) and lateral (B) radiographs show fuzziness of margins of wires indicating electrolytic corrosion. Radionuclide bone scan (C) shows increased tracer activity in left femur. This corresponds to site of corrosion.

 


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  		Fig. 2. —79-year-old woman with thigh pain after fall. Radiograph shows corrosion of screws in retained surgical plate placed 40 years earlier for femur fracture and fuzzy debris around screws.

 


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  		Fig. 3A. —78-year-old woman with distal humeral fracture. Lateral (A) and frontal (B) radiographs show corrosion of retained surgical screw placed in radius 12 years earlier. Note fuzziness along surface of screw.

 


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  		Fig. 3B. —78-year-old woman with distal humeral fracture. Lateral (A) and frontal (B) radiographs show corrosion of retained surgical screw placed in radius 12 years earlier. Note fuzziness along surface of screw.

 


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  		Fig. 4. —80-year-old woman with hip pain after fall. Radiograph shows significant dissolution and corrosion of surgical nail placed 30 years earlier to repair a fracture.

 


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  		Fig. 5A. —68-year-old woman with thigh pain after fall. Frontal (A) and lateral (B) radiographs show corrosion and dissolution of retained plate and screws, placed 60 years earlier when patient was child.

 


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  		Fig. 5B. —68-year-old woman with thigh pain after fall. Frontal (A) and lateral (B) radiographs show corrosion and dissolution of retained plate and screws, placed 60 years earlier when patient was child.

 


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  		Fig. 6A. —73-year-old woman with foot pain. She gave history of having stepped on needle 5 years earlier. Frontal (A) and lateral (B) radiographs show corrosion and fracture of sewing needle in plantar aspect of foot.

 


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  		Fig. 6B. —73-year-old woman with foot pain. She gave history of having stepped on needle 5 years earlier. Frontal (A) and lateral (B) radiographs show corrosion and fracture of sewing needle in plantar aspect of foot.

 


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  		Fig. 7. —33-year-old male professional hockey player. Radiograph of heel shows that corrosion and fractures of broken hypodermic needles from self-injections. Patient had been performing such injections for years.

 


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  		Fig. 8A. —54-year-old woman with foot pain. Patient suffered puncture wound while walking barefoot on lawn 4 years earlier. Frontal (A) and lateral (B) radiographs show corrosion and fractures of broken needle in plantar aspect of foot.

 


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  		Fig. 8B. —54-year-old woman with foot pain. Patient suffered puncture wound while walking barefoot on lawn 4 years earlier. Frontal (A) and lateral (B) radiographs show corrosion and fractures of broken needle in plantar aspect of foot.

 

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