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Radiological signs of osteitis around extramedullary metal implants. A radiographic-microbiological correlative
C N Kraft1, U Schlegel, D Pfluger
1Department of Orthopaedic Surgery, University of Bonn, Germany.
Abstract:
Radiographic changes in the early stages of osteomyelitis may be subtle and, especially after plate osteosynthesis, frequently missed. A previously described experimental model of local bacterial infection was used in an attempt to determine the reliability of specific changes on conventional radiographs for the diagnosis of osteitis after metal-plate implantation and subsequent inoculation of Staphylococcus aureus in rabbit tibiae. Roentgenograms of the treated limbs were evaluated, and seven radiographic parameters, to which numerical scores were assigned, were determined for each bone. Our results substantiate the conclusion that a radiographically verified periosteal reaction is a constant and early skeletal feature of acute osteomyelitis and has the strongest association to the microbiological results (P < 0.05), emphasising its high predictive value. Plate implantation does not notably impede the diagnosis of osteomyelitis. An association between the amount of inoculated bacteria and the extent of radiographic changes could be found. The results of this present study closely resemble those described in man and suggest that this model may be useful for future experimental investigations in determining a score judging the severity of osseous involvement in local bacterial infection after plate osteosynthesis.
Insights
Early radiographic signs of osteomyelitis, particularly after plate osteosynthesis, are often missed. A periosteal reaction is a reliable early indicator of bacterial bone infection, even with metal implants.
Area of Science:
- Orthopedics
- Radiology
- Infectious Diseases
Background:
- Early diagnosis of osteomyelitis is challenging, with subtle radiographic changes often missed, especially post-plate osteosynthesis.
- Conventional radiography plays a crucial role in diagnosing bone infections.
Purpose of the Study:
- To evaluate the reliability of specific radiographic parameters for diagnosing osteitis after metal-plate implantation and bacterial inoculation.
- To assess the impact of plate osteosynthesis on the diagnosis of osteomyelitis.
Main Methods:
- Utilized an established experimental model of local bacterial infection in rabbit tibiae.
- Inoculated Staphylococcus aureus into rabbit tibiae with subsequent metal-plate implantation.
- Evaluated radiographs using seven defined radiographic parameters with assigned numerical scores.
Main Results:
- A radiographically verified periosteal reaction is a constant and early feature of acute osteomyelitis.
- Periosteal reaction showed the strongest association with microbiological results (P < 0.05), indicating high predictive value.
- Plate implantation did not significantly hinder osteomyelitis diagnosis; bacterial load correlated with radiographic changes.
Conclusions:
- Periosteal reaction is a highly reliable early diagnostic marker for osteomyelitis, even in the presence of internal fixation.
- The experimental model effectively mimics human osteomyelitis and can be used for future severity scoring studies.
