Osteomyelitis
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Osteomyelitis
Osteomyelitis
SynonymBone infection
OsteomylitisMark.png
Osteomyelitis of the 1st toe
SpecialtyInfectious disease, orthopedics
SymptomsPain in a specific bone, overlying redness, fever, weakness[1]
ComplicationsAmputation[2]
Usual onsetYoung or old[1]
DurationShort or long term[2]
CausesBacterial, fungal[2]
Risk factorsDiabetes, intravenous drug use, prior removal of the spleen, trauma to the area[1]
Diagnostic methodBlood tests, medical imaging, bone biopsy[2]
Differential diagnosisCharcot's joint, rheumatoid arthritis, infectious arthritis, giant cell tumor, cellulitis[1][3]
TreatmentAntimicrobials, surgery[4]
PrognosisLow risk of death with treatment[5]
Frequency2.4 per 100,000 per year[6]

Osteomyelitis (OM) is an infection of bone.[1] Symptoms may include pain in a specific bone with overlying redness, fever, and weakness.[1] The long bones of the arms and legs are most commonly involved in children, while the feet, spine, and hips are most commonly involved in adults.[2]

The cause is usually a bacterial infection; rarely, a fungal infection.[1][2] It may occur by spread from the blood or from surrounding tissue.[4] Risks for developing osteomyelitis include diabetes, intravenous drug use, prior removal of the spleen, and trauma to the area.[1] Diagnosis is typically suspected based on symptoms.[2] This is then supported by blood tests, medical imaging, or bone biopsy.[2]

Treatment often involves both antimicrobials and surgery.[4] In those with poor blood flow, amputation may be required.[2] Treatment outcomes are generally good when the condition has only been present a short time.[2] About 2.4 per 100,000 people are affected a year.[6] The young and old are more commonly affected.[1] Males are more commonly affected than females.[3] The condition was described at least as early as the 300s BC by Hippocrates.[4] Before the availability of antibiotics the risk of death was significant.[7]

Signs and symptoms

Symptom may include pain in a specific bone with overlying redness, fever, and weakness.[1] Onset may be sudden or gradual.[1]

Cause

Age group Most common organisms
Newborns (younger than 4 mo) S. aureus, Enterobacter species, and group A and B Streptococcus species
Children (aged 4 mo to 4 y) S. aureus, group A Streptococcus species, Haemophilus influenzae, and Enterobacter species
Children, adolescents (aged 4 y to adult) S. aureus (80%), group A Streptococcus species, H. influenzae, and Enterobacter species
Adult S. aureus and occasionally Enterobacter or Streptococcus species
Sickle cell anemia patients Salmonella species are most common in patients with sickle cell disease.[8]

In children, the long bones are usually affected. In adults, the vertebrae and the pelvis are most commonly affected.

Acute osteomyelitis almost invariably occurs in children because of rich blood supply to the growing bones. When adults are affected, it may be because of compromised host resistance due to debilitation, intravenous drug abuse, infectious root-canaled teeth, or other disease or drugs (e.g., immunosuppressive therapy).

Osteomyelitis is a secondary complication in 1-3% of patients with pulmonary tuberculosis.[9] In this case, the bacteria, in general, spread to the bone through the circulatory system, first infecting the synovium (due to its higher oxygen concentration) before spreading to the adjacent bone.[9] In tubercular osteomyelitis, the long bones and vertebrae are the ones that tend to be affected.[9]

Staphylococcus aureus is the organism most commonly isolated from all forms of osteomyelitis.[9]

Bloodstream-sourced osteomyelitis is seen most frequently in children, and nearly 90% of cases are caused by Staphylococcus aureus. In infants, S. aureus, Group B streptococci (most common[10]) and Escherichia coli are commonly isolated; in children from one to 16 years of age, S. aureus, Streptococcus pyogenes, and Haemophilus influenzae are common. In some subpopulations, including intravenous drug users and splenectomized patients, Gram-negative bacteria, including enteric bacteria, are significant pathogens.[11]

The most common form of the disease in adults is caused by injury exposing the bone to local infection. Staphylococcus aureus is the most common organism seen in osteomyelitis, seeded from areas of contiguous infection. But anaerobes and Gram-negative organisms, including Pseudomonas aeruginosa, E. coli, and Serratia marcescens, are also common. Mixed infections are the rule rather than the exception.[11]

Systemic mycotic (fungal) infections may also cause osteomyelitis. The two most common are Blastomyces dermatitidis and Coccidioides immitis.

In osteomyelitis involving the vertebral bodies, about half the cases are due to S. aureus, and the other half are due to tuberculosis (spread hematogenously from the lungs). Tubercular osteomyelitis of the spine was so common before the initiation of effective antitubercular therapy, it acquired a special name, Pott's disease.

The Burkholderia cepacia complex has been implicated in vertebral osteomyelitis in intravenous drug users.[12]

Pathogenesis

In general, microorganisms may infect bone through one or more of three basic methods

The area usually affected when the infection is contracted through the bloodstream is the metaphysis of the bone.[13] Once the bone is infected, leukocytes enter the infected area, and, in their attempt to engulf the infectious organisms, release enzymes that lyse the bone. Pus spreads into the bone's blood vessels, impairing their flow, and areas of devitalized infected bone, known as sequestra, form the basis of a chronic infection.[9] Often, the body will try to create new bone around the area of necrosis. The resulting new bone is often called an involucrum.[9] On histologic examination, these areas of necrotic bone are the basis for distinguishing between acute osteomyelitis and chronic osteomyelitis. Osteomyelitis is an infective process that encompasses all of the bone (osseous) components, including the bone marrow. When it is chronic, it can lead to bone sclerosis and deformity.

Chronic osteomyelitis may be due to the presence of intracellular bacteria (inside bone cells).[14] Also, once intracellular, the bacteria are able to escape and invade other bone cells.[15] At this point, the bacteria may be resistant to some antibiotics.[16] These combined facts may explain the chronicity and difficult eradication of this disease, resulting in significant costs and disability, potentially leading to amputation. Intracellular existence of bacteria in osteomyelitis is likely an unrecognized contributing factor to its chronic form.

In infants, the infection can spread to a joint and cause arthritis. In children, large subperiosteal abscesses can form because the periosteum is loosely attached to the surface of the bone.[9]

Because of the particulars of their blood supply, the tibia, femur, humerus, vertebra, the maxilla, and the mandibular bodies are especially susceptible to osteomyelitis.[17] Abscesses of any bone, however, may be precipitated by trauma to the affected area. Many infections are caused by Staphylococcus aureus, a member of the normal flora found on the skin and mucous membranes. In patients with sickle cell disease, the most common causative agent is Salmonella, with a relative incidence more than twice that of S. aureus.[8]

Diagnosis

Mycobacterium doricum osteomyelitis and soft tissue infection. Computed tomography scan of the right lower extremity of a 21-year-old patient, showing abscess formation adjacent to nonunion of a right femur fracture.
Extensive osteomyelitis of the forefoot
Osteomyelitis in both feet as seen on bone scan

The diagnosis of osteomyelitis is complex and relies on a combination of clinical suspicion and indirect laboratory markers such as a high white blood cell count and fever, although confirmation of clinical and laboratory suspicion with imaging is usually necessary.[18]

Radiographs and CT are the initial method of diagnosis, but are not sensitive and only moderately specific for the diagnosis. They can show the cortical destruction of advanced osteomyelitis, but can miss nascent or indolent diagnoses.[18]

Confirmation is most often by MRI. The presence of edema, diagnosed as increased signal on T2 sequences, is sensitive, but not specific, as edema can occur in reaction to adjacent cellulitis. Confirmation of bony marrow and cortical destruction by viewing the T1 sequences significantly increases specificity. The administration of intravenous gadolinium-based contrast enhances specificity further. In certain situations, such as severe Charcot arthropathy, diagnosis with MRI is still difficult.[18] Similarly, it is limited in distinguishing bone infarcts from osteomyelitis in sickle cell anemia.[19]

Nuclear medicine scans can be a helpful adjunct to MRI in patients who have metallic hardware that limits or prevents effective magnetic resonance. Generally a triple phase technetium 99 based scan will show increased uptake on all three phases. Gallium scans are 100% sensitive for osteomyelitis but not specific, and may be helpful in patients with metallic prostheses. Combined WBC imaging with marrow studies have 90% accuracy in diagnosing osteomyelitis.[20]

Diagnosis of osteomyelitis is often based on radiologic results showing a lytic center with a ring of sclerosis.[9]Culture of material taken from a bone biopsy is needed to identify the specific pathogen;[21] alternative sampling methods such as needle puncture or surface swabs are easier to perform, but do not produce reliable results.[22][23]

Factors that may commonly complicate osteomyelitis are fractures of the bone, amyloidosis, endocarditis, or sepsis.[9]

Classification

The definition of OM is broad, and encompasses a wide variety of conditions. Traditionally, the length of time the infection has been present and whether there is suppuration (pus formation) or sclerosis (increased density of bone) is used to arbitrarily classify OM. Chronic OM is often defined as OM that has been present for more than one month. In reality, there are no distinct subtypes; instead there is a spectrum of pathologic features that reflect balance between the type and severity of the cause of the inflammation, the immune system and local and systemic predisposing factors.

OM can also be typed according to the area of the skeleton in which it is present. For example, osteomyelitis of the jaws is different in several respects from osteomyelitis present in a long bone. Vertebral osteomyelitis is another possible presentation.

Treatment

Osteomyelitis often requires prolonged antibiotic therapy for weeks or months. A PICC line or central venous catheter can be placed for long-term intravenous medication administration. It may require surgical debridement in severe cases, or even amputation.

Initial first-line antibiotic choice is determined by the patient's history and regional differences in common infective organisms. A treatment lasting 42 days is practiced in a number of facilities.[24] Local and sustained availability of drugs have proven to be more effective in achieving prophylactic and therapeutic outcomes.[25] Open surgery is needed for chronic osteomyelitis, whereby the involucrum is opened and the sequestrum is removed or sometimes saucerization[26] can be done. Hyperbaric oxygen therapy has been shown to be a useful adjunct to the treatment of refractory osteomyelitis.[27][28]

Before the widespread availability and use of antibiotics, blow fly larvae were sometimes deliberately introduced to the wounds to feed on the infected material, effectively scouring them clean.[29][30] In 1875, American artist Thomas Eakins depicted a surgical procedure for osteomyelitis at Jefferson Medical College, in a famous oil painting titled The Gross Clinic.

There is tentative evidence that bioactive glass may also be useful in long bone infections.[31] Support from randomized controlled trials, however, is not available as of 2015.[32]

History

The word is from Greek words osteon, meaning bone, - myelo- meaning marrow, and -? -itis meaning inflammation.

Fossil record

Evidence for osteomyelitis found in the fossil record is studied by paleopathologists, specialists in ancient disease and injury. It has been reported in fossils of the large carnivorous dinosaur Allosaurus fragilis.[33]

See also

References

  1. ^ a b c d e f g h i j k "Osteomyelitis". NORD (National Organization for Rare Disorders). 2005. Archived from the original on 11 February 2017. Retrieved 2017.
  2. ^ a b c d e f g h i j "Osteomyelitis". Genetic and Rare Diseases Information Center (GARD). 2016. Archived from the original on 9 February 2017. Retrieved 2017.
  3. ^ a b Ferri, Fred F. (2017). Ferri's Clinical Advisor 2018 E-Book: 5 Books in 1. Elsevier Health Sciences. p. 924. ISBN 9780323529570. Archived from the original on 2017-09-10.
  4. ^ a b c d Schmitt, SK (June 2017). "Osteomyelitis". Infectious Disease Clinics of North America. 31 (2): 325-338. doi:10.1016/j.idc.2017.01.010. PMID 28483044.
  5. ^ Bennett, John E.; Dolin, Raphael; Blaser, Martin J. (2014). Principles and Practice of Infectious Diseases. Elsevier Health Sciences. p. 2267. ISBN 9781455748013. Archived from the original on 2017-09-10.
  6. ^ a b Hochberg, Marc C.; Silman, Alan J.; Smolen, Josef S.; Weinblatt, Michael E.; Weisman, Michael H. (2014). Rheumatology E-Book. Elsevier Health Sciences. p. 885. ISBN 9780702063039. Archived from the original on 2017-09-10.
  7. ^ Brackenridge, R. D. C.; Croxson, Richard S.; Mackenzie, Ross (2016). Medical Selection of Life Risks 5th Edition Swiss Re branded. Springer. p. 912. ISBN 9781349566327. Archived from the original on 2017-09-10.
  8. ^ a b Burnett, M.W.; J.W. Bass; B.A. Cook (1998-02-01). "Etiology of osteomyelitis complicating sickle cell disease". Pediatrics. 101 (2): 296-297. doi:10.1542/peds.101.2.296. PMID 9445507.
  9. ^ a b c d e f g h i j Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; & Mitchell, Richard N. (2007). Robbins Basic Pathology (8th ed.). Saunders Elsevier. pp. 810-811 ISBN 978-1-4160-2973-1
  10. ^ Haggerty, Maureen (2002). "Streptococcal Infections". Gale Encyclopedia of Medicine. The Gale Group. Archived from the original on 2008-03-25. Retrieved .
  11. ^ a b Carek, P.J.; L.M. Dickerson; J.L. Sack (2001-06-15). "Diagnosis and management of osteomyelitis". Am Fam Physician. 63 (12): 2413-20. PMID 11430456.
  12. ^ Weinstein, Lenny; Knowlton, Christin A.; Smith, Miriam A. (2007-12-16). "Cervical osteomyelitis caused by Burkholderia cepacia after rhinoplasty". J Infect Developing Countries. 2 (1): 76-77. ISSN 1972-2680. Archived from the original on January 7, 2009.
  13. ^ a b Luqmani, Raashid; Robb, James; Daniel, Porter; Benjamin, Joseph (2013). Orthopaedics, Trauma and Rheumatology (second ed.). Mosby. p. 96. ISBN 9780723436805.
  14. ^ Ellington Microb Pathog 1999
  15. ^ Ellington JBJS Br 2003
  16. ^ Ellington J Ortho Res 2006
  17. ^ King MD, Randall W, Johnson D (2006-07-13). "Osteomyelitis". eMedicine. WebMD. Archived from the original on 2007-11-09. Retrieved .
  18. ^ a b c Howe, B. M.; Wenger, D. E.; Mandrekar, J; Collins, M. S. (2013). "T1-weighted MRI imaging features of pathologically proven non-pedal osteomyelitis". Academic Radiology. 20 (1): 108-14. doi:10.1016/j.acra.2012.07.015. PMID 22981480.
  19. ^ Delgado, J; Bedoya, M. A.; Green, A. M.; Jaramillo, D; Ho-Fung, V (2015). "Utility of unenhanced fat-suppressed T1-weighted MRI in children with sickle cell disease - can it differentiate bone infarcts from acute osteomyelitis?". Pediatric Radiology. 45 (13): 1981-7. doi:10.1007/s00247-015-3423-8. PMID 26209118.
  20. ^ Termaat, M. F.; Raijmakers, P. G.; Scholten, H. J.; Bakker, F. C.; Patka, P; Haarman, H. J. (2005). "The accuracy of diagnostic imaging for the assessment of chronic osteomyelitis: A systematic review and meta-analysis". The Journal of Bone and Joint Surgery. American Volume. 87 (11): 2464-71. doi:10.2106/JBJS.D.02691. PMID 16264122.
  21. ^ Zuluaga AF; Galvis W; Saldarriaga JG; Agudelo M; Salazar BE; Vesga O (2006-01-09). "Etiologic diagnosis of chronic osteomyelitis: A prospective study". Archives of Internal Medicine. 166 (1): 95-100. doi:10.1001/archinte.166.1.95. ISSN 0003-9926. PMID 16401816.
  22. ^ Zuluaga, Andrés F; Galvis, Wilson; Jaimes, Fabián; Vesga, Omar (2002-05-16). "BMC Infectious Diseases". BMC Infectious Diseases. 2 (1): 8. doi:10.1186/1471-2334-2-8. PMC 115844. PMID 12015818. Archived from the original on 2010-01-17.
  23. ^ Senneville E, Morant H, Descamps D, et al. (2009). "Needle puncture and transcutaneous bone biopsy cultures are inconsistent in patients with diabetes and suspected osteomyelitis of the foot". Clin Infect Dis. 48 (7): 888&ndash, 93. doi:10.1086/597263. PMID 19228109.
  24. ^ Putland M.D, Michael S., Hyperbaric Medicine, Capital Regional Medical Center, Tallahassee, Florida, personal inquiry June 2008.
  25. ^ Soundrapandian, C; Datta S; Sa B (2007). "Drug-eluting implants for osteomyelitis". Crit Rev Ther Drug Carrier Syst. 24 (6): 493-545. doi:10.1615/CritRevTherDrugCarrierSyst.v24.i6.10. PMID 18298388. Archived from the original on 2011-07-07. Retrieved .
  26. ^ http://medical-dictionary.thefreedictionary.com/saucerization
  27. ^ Mader JT, Adams KR, Sutton TE (1987). "Infectious diseases: pathophysiology and mechanisms of hyperbaric oxygen". J. Hyperbaric Med. 2 (3): 133-140. Archived from the original on 2009-02-13. Retrieved .
  28. ^ Kawashima M, Tamura H, Nagayoshi I, Takao K, Yoshida K, Yamaguchi T (2004). "Hyperbaric oxygen therapy in orthopedic conditions". Undersea Hyperb Med. 31 (1): 155-62. PMID 15233171. Archived from the original on 2009-02-16. Retrieved .
  29. ^ Baer M.D., William S. (1 July 1931). "The Treatment of Chronic Osteomyelitis with the Maggot (Larva of the Blow Fly)". Journal of Bone and Joint Surgery. 13 (3): 438-475. Archived from the original on 22 December 2007. Retrieved .
  30. ^ McKeever, Duncan Clark (June 2008). "The Classic: Maggots in Treatment of Osteomyelitis: A Simple Inexpensive Method". Clin. Orthop. Relat. Res. 466 (6): 1329-35. doi:10.1007/s11999-008-0240-5. PMC 2384033. PMID 18404291.
  31. ^ Aurégan, JC; Bégué, T (December 2015). "Bioactive glass for long bone infection: a systematic review". Injury. 46 Suppl 8: S3-7. doi:10.1016/s0020-1383(15)30048-6. PMID 26747915.
  32. ^ van Gestel, NA; Geurts, J; Hulsen, DJ; van Rietbergen, B; Hofmann, S; Arts, JJ (2015). "Clinical Applications of S53P4 Bioactive Glass in Bone Healing and Osteomyelitic Treatment: A Literature Review". BioMed Research International. 2015: 1-12. doi:10.1155/2015/684826. PMC 4609389. PMID 26504821.
  33. ^ Molnar, R. E., 2001, Theropod paleopathology: a literature survey: In: Mesozoic Vertebrate Life, edited by Tanke, D. H., and Carpenter, K., Indiana University Press, p. 337-363.

External links

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Osteomyelitis
 



 

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