Imaging
Osteomyelitis
- Preliminary Diagnosis: Osteomyelitis
-
I. What imaging technique is first-line for this diagnosis?
- II. Describe the advantages and disadvantages of this technique for diagnosis of osteomyelitis.
-
III. What are the contraindications for the first-line imaging technique?
-
IV. What alternative imaging techniques are available?
- V. Describe the advantages and disadvantages of the alternative techniques for diagnosis of osteomyelitis.
- VI. What are the contraindications for the alternative imaging techniques?
Preliminary Diagnosis: Osteomyelitis
I. What imaging technique is first-line for this diagnosis?
Plain film radiography
II. Describe the advantages and disadvantages of this technique for diagnosis of osteomyelitis.
Advantages
Quick
Can reliably exclude common causes of musculoskeletal pain, such as fracture, arthropathy, or neoplasm
Can strongly suggest osteomyelitis given the appropriate clinical history, laboratory findings, and positive pertinent radiographic findings
Provides superior resolution of the osseous structures
In comparison to CT, patients are exposed to less ionizing radiation
Disadvantages
Not sensitive for diagnosis or complications
Radiographic changes of acute osteomyelitis occur 1-2 weeks following the clinical onset of infection
Exposes the patient to ionizing radiation
III. What are the contraindications for the first-line imaging technique?
No significant contraindications exist.
IV. What alternative imaging techniques are available?
MRI with gadolinium
Contrast enhanced CT
Three-phase Tc-99m HDP/MDP bone scintigraphy
Combined tagged WBC imaging/Tc-99m sulfur colloid imaging
V. Describe the advantages and disadvantages of the alternative techniques for diagnosis of osteomyelitis.
MRI with Gadolinium
Advantages
Gold standard for diagnosing osteomyelitis
Highly sensitive and specific for diagnosing osteomyelitis, when contrast is used
Provides detail on the extent of infection
Findings substantially precede the radiographic changes of acute osteomyelitis
Can accurately detect complications of osteomyelitis: sinus tract, skin ulceration, abscesses, and pathologic fractures
Disadvantages
Provides less osseous detail than CT
Expensive
Time consuming
Requires significant patient cooperation to minimize motion artifact
Sensitivity/specificity decreases in setting of coexistent degenerative change or adjacent prosthesis
Intravenous contrast requires that the patient have good renal function with a GFR greater than 60. Administration of intravenous contrast is decided individually on a case-by-case basis with a GFR greater than 30 and less than 60.
Contrast enhanced CT
Advantages
Provides superior anatomic and spatial detail compared with plain radiographs
Findings parallel the radiographic findings; however, osseous lytic destruction and serpiginous tracking are more evident.
Can better detail the extent of infection and development of complications (ie, soft tissue abscesses) when iodinated contrast is utilized
Disadvantages
Exposes the patient to a large amount of ionizing radiation
Less sensitive and specific than MRI for detecting complications of osteomyelitis
Decreased sensitivity in presence of adjacent metallic prosthesis, secondary to artifact
Exposure to intravenous contrast
Multiphase Bone Scintigraphy
Advantages
Highly sensitive in setting of acute infection, if increased activity detected on all three phases.
Useful if suspecting multifocal osteomyelitis, as a larger region or the whole body may be imaged
May be used despite CT or MR contraindications
Disadvantages
May be falsely negative
Lacks specificity, often requiring additional radiologic correlation with MRI or tagged WBC scan. Markedly diminished in the setting of arthropathy, surgical change (ie, prosthesis), trauma, and noninfectious processes (ie, Paget’s disease, fibrous dysplasia, etc)
Lacks anatomic detail afforded by CT and MR
Limited in patients with renal insufficiency
Exposes patient to more radiation than if CT, plain film, or MR were utilized.
Requires significant patient cooperation, often requiring patients not to move for prolonged periods
In-111 tagged WBC scan with Tc-99m Sulfur Colloid Marrow Mapping
Advantages
Highly sensitive and specific for acute osteomyelitis
Can reliably distinguish acute osteomyelitis from Charcot neuropathic change.
Useful if suspecting multifocal osteomyelitis, as a larger region or the whole body may be imaged.
May be used despite CT or MR contraindications
Disadvantages
May be falsely positive in patients with recent fractures or orthopedic postsurgical change
Not sensitive for spinal osteomyelitis
Lacks anatomic detail afforded by CT and MR
Exposes patient to more radiation than if CT, plain film, or MR were utilized
Requires significant patient cooperation, often requiring patients not to move for prolonged periods
VI. What are the contraindications for the alternative imaging techniques?
MRI with Gadolinium
Contraindicated in patients with non–MR-compatible metallic hardware or foreign bodies
Gadolinium is contraindicated in the patient with impaired renal function and a GFR less than 30. Administration of intravenous contrast is decided individually on a case-by-case basis with a GFR greater than 30 and less than 60.
Contrast enhanced CT
Contraindicated in pregnant women especially within the first two trimesters.
Patients with allergic reactions (eg, itching, rash) to intravenous contrast and more severe allergic reactions (eg, angioedema of the throat, anaphylaxis) should be pretreated with steroids and antihistamines for a minimum of 13 hours prior to CT imaging with IV contrast.
Multiphase Bone Scintigraphy
Bone scintigraphy is contraindicated in the pregnant patient.
In-111 tagged WBC scan with Tc-99m Sulfur Colloid Marrow Mapping
No significant contraindications exist.
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