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Subacute osteomyelitis
C S Hayes1, S D Heinrich, R Craver
1Department of Family Medicine, Carraway Methodist Medical Center, Birmingham, Ala.
Abstract:
Subacute osteomyelitis is a chronic low-grade infection of bone characterized by a lack of systemic manifestations. The onset is insidious. Pain is the most common symptom, and has usually been present for several months before the initial evaluation. Swelling and tenderness over the area of involved bone may also be seen. Laboratory evaluation is unrevealing, with a normal white blood cell count and differential. The erythrocyte sedimentation rate may also be normal. The most common organism cultured from a subacute osteomyelitis is a staphylococcus species. Twenty-five percent of subacute bone infections are sterile. The most common manifestation of a subacute osteomyelitis in a child is a geographic lytic metaphyseal lesion (Brodie's abscess). Treatment of a culture positive infection includes surgical debridement and antibiotic therapy. A sterile abscess can be treated conservatively without antibiotics, provided the patient's symptoms are improving and the lesion is regressing radiographically.
Insights
Subacute osteomyelitis presents insidiously with bone pain, often lacking systemic signs or abnormal labs. Treatment varies from antibiotics and debridement for infections to conservative management for sterile abscesses.
Area of Science:
- Orthopedics
- Infectious Diseases
- Pediatric Osteology
Background:
- Subacute osteomyelitis is a persistent, low-grade bone infection.
- It characteristically lacks overt systemic symptoms, making diagnosis challenging.
- Insidious onset with prolonged pain is typical before medical evaluation.
Observation:
- Patients often present with months of bone pain, localized swelling, and tenderness.
- Standard laboratory tests, including white blood cell count and erythrocyte sedimentation rate, are frequently normal.
- Radiographic findings in children may include a geographic lytic metaphyseal lesion, known as Brodie's abscess.
Findings:
- Staphylococcus species are the most common causative organisms in culture-positive cases.
- A significant percentage (25%) of subacute bone infections are sterile, yielding no microbial growth.
- Clinical presentation and radiographic evidence are crucial for diagnosis due to non-specific laboratory results.
Implications:
- Culture-positive subacute osteomyelitis requires surgical debridement and antibiotic therapy.
- Sterile subacute osteomyelitis or Brodie's abscess can be managed conservatively if symptoms improve and radiographic regression is observed.
- Accurate diagnosis and tailored treatment are essential for favorable outcomes in subacute osteomyelitis.