Management of Osteomyelitis

Diagnosis

The gold standard for osteomyelitis diagnosis is bone biopsy with culture and histopathology, which provides a definitive diagnosis, according to the Infectious Diseases Society of America 1, 2

Characteristic radiographic findings of osteomyelitis include:

Finding	Description
Erosion	Loss of bone tissue
Periosteal reaction	Inflammation of the periosteum
Mixed lucency and sclerosis	Combination of bone destruction and new bone formation
Sequestra or involucrum	Dead bone fragments or new bone formation around dead bone

If the X-ray shows classic changes of osteomyelitis, such as cortical erosion, periosteal reaction, mixed lucency and sclerosis, it can confirm the diagnosis, with a sensitivity of 54% and specificity of 68% for early osteomyelitis 2
MRI is recommended when X-rays are inconclusive, with a strong recommendation and moderate evidence, as suggested by the Infectious Diseases Society of America 1, 3

The duration of antibiotic therapy is typically 4-6 weeks, with an initial parenteral phase followed by oral antibiotics with good bioavailability, as recommended by the European Society of Clinical Microbiology and Infectious Diseases 4, 5
Oral options with good bioavailability include fluoroquinolones, clindamycin, linezolid, fusidic acid, and trimethoprim-sulfamethoxazole, with a strength of evidence of B-III 5, 2
Surgical debridement is a critical component of treatment for most bone infections, with absolute indications including progressive neurologic deficits, progressive deformity, and spinal instability with or without pain despite adequate antimicrobial therapy, as recommended by the IDSA with a strong recommendation 6
Two primary treatment strategies can be considered: a primarily surgical approach with complete resection of infected bone, or a primarily medical approach with antibiotics and limited or no surgery, according to the Infectious Diseases Society of America 1

Diabetic patients require closer monitoring due to higher risk of complications and morbidity, with a strength of evidence of B-II 7, 8
Immunocompromised patients may require more aggressive treatment, with a strength of evidence of B-III 8
Osteomyelitis management in pregnant women and immunocompromised patients should be individualized, with a strength of evidence of B-II 9, 8
Surgical consultation should be obtained immediately for all cases of mandibular osteomyelitis, as recommended by the American Diabetes Association 5
Surgery should be performed by someone with thorough knowledge of anatomy and fascial planes, as emphasized by the Infectious Diseases Society of America 5

MRI after treatment is generally not necessary if clinical improvement is observed, but consider follow-up imaging only if evidence of infection has not resolved after 4 weeks of appropriate therapy, or if there is clinical suspicion of recurrence or progression 1, 10
Serial plain radiographs may be more cost-effective for monitoring bone healing, with regular clinical assessment of pain, function, and wound healing, as well as monitoring inflammatory markers (ESR/CRP) to guide response to therapy, essential for follow-up, with a strength of evidence of B-III 2, 11
Follow-up for a minimum of 6 months after completion of antibiotics is recommended, with regular monitoring of inflammatory markers, clinical assessment of pain, function, and wound healing, and follow-up imaging as needed to assess bone healing, with a strength of evidence of B-III 6
The prognosis of chronic osteomyelitis depends on multiple factors, including the location and extent of the infection, the causative microorganism, and the patient's vascular and immunological status, as well as adequate surgical and antibiotic treatment, according to the Clinical Infectious Diseases journal 2, 1
The cure rate with adequate combined treatment is around 70-80%, although recurrences are frequent and can appear years after initial treatment, as stated in the Clinical Infectious Diseases journal 2, 1

Osteomyelitis treatment requires a multidisciplinary approach, including infectious disease specialists, surgeons, and other healthcare professionals, with a strength of evidence of B-II 12, 10
If infection is not responding, it is essential to check patient compliance with antibiotics, consider undiagnosed deep abscess, and assess for more severe ischemia than initially suspected, according to the Infectious Diseases Society of America 2
The Infectious Diseases Society of America (IDSA) guidelines emphasize the importance of vascular assessment in patients with a history of peripheral artery disease (PAD) and recent amputation for osteomyelitis, as inadequate blood supply can lead to treatment failure in diabetic foot infections 1