Chronic Osteomyelitis In Children

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chronic osteomyelitis in children, management, classification

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  • . A tibial lesion with no involucrum in a seven-year-old girl who was seen one year after onset of thedisease.Fig. 4-A: At admission, there was dislocation of the proximal tibiofibular joint, a sequestrum, bone loss of 17 per cent, and varus and flexionangulation of 10 and 25 degrees.Fig. 4-B: Two months after sequestrectomy, fibular osteotomy, and immediate grafting of the tibia with a strut graft that was obtained from the site of the ipsilateral fibular osteotomy, the graft had not been incorporated.
  • Eight months after the fibular cortical grafting, the graft had been resorbed and the lesion had not healed. At that time, corticocancellousiliac grafts were placed about the defect in the tibia, but the fibula was left alone.Fig. 4-D: Four months after the grafting, fusion had occurred and the position of the lateral malleolus relative to the tibia was unchanged
  • Chronic Osteomyelitis In Children

    1. 1. Chronic Osteomyelitis in Children<br />DR. K.S.V. Rao<br />MBBS, D.Orth, DNB( Ortho) <br />Khoulahospital,Muscat<br />
    2. 2. 1<br />Causes<br /><ul><li>Sequele of untreated acute hematogenous osteomyelitis
    3. 3. Hematogenous spread from organisms of low virulence
    4. 4. Spread of pyogenic infections from neighbouring tissues
    5. 5. Open fractures
    6. 6. Punctured wounds
    7. 7. Complications of surgical procedures</li></li></ul><li>Clinical Findings<br />Fever, malaise, bone pain<br />Local tenderness / temperature ±<br />Sinus- discharge<br />Puckering /Granulation at mouth of sinus ±<br />Bony thickening- localised /length of diaphysis<br />Bony surface irregular<br />Wasting of muscles<br />Pathological fractures<br />
    8. 8. Pathological Features<br />Hallmark is bone necrosis<br />Exudation of PMNL, large no. of lymphocytes, histiocytes and plasma cells( occasionally )<br />Formation of new bone (involucrum) from surviving periosteum & endosteum<br />Involucrum- enveloping sheet of live bone with perforations (cloacae) for pus to drain to the exterior causing chronic sinus <br />
    9. 9. Proliferation of endosteal new bone causing obliteration of medullary canal<br />Prostaglandin E production is increased many folds in infected bone causing bone resorption & sequestration formation<br />Resorption is mediated by several cytokines –IL-1, IL-6, IL-11 & TNF α<br />
    10. 10. Why Chronicity ? <br />Negative charge on surface of devitalized bone promotes organism adherence and subsequent glycocalyx formation thereby preventing access to phagocytes & microbials.<br />Bacteria enter the interior of the cell eluding host defense. Dead & dying osteoblast release viable S. Aureus causing persistence of infection & its flare up.<br />
    11. 11. Main infecting organism is likely to be the same organism as when present at the original attack even if a recurrent episode occurs years later!!<br />Sharrad .pediatric orthopedics & fractures vol-II<br />
    12. 12. Labs<br />Leukocyte count-  in acute OM, often normal in chronic cases (elevated in only 35%)<br />ESR– in both . after T/t- but increases immediately after operative debridement. Not a sensitive test to r/o acute or chronic OM, not reliable in compromised host/isolated findings ±<br />CRP -  in acute/chronic, faster than ESR, more sensitive. Favorable outcome if CRP decreases within 3 days of antibiotic treatment in acute cases, test weekly in acute & every ? 2 wks in chronic OM <br />
    13. 13. Monitoring drug toxicity<br /> Serum creatinine levels<br /> Liver function tests<br />Nutritional status<br /> S. albumin level<br /> Total iron binding capacity<br />Blood culture- yield approx. 60%<br />PCR<br />Culture & sensitivity- discharge/sinus<br />Deep bone biopsy- yield approx. 90%<br />( gold standard) <br />
    14. 14. Microbiology<br />Bone culture/deep bone biopsy are a must except in Cierny-Mader stage-1 where blood/ joint fluid cultures obviate need of biopsy<br />Culture of samples from sinus tract is not reliable for predicting which organism will be isolated from infected bone<br />
    15. 15. Comparision of results of bacterial cultures from multiple sites in chronic OM<br />Patzakis et al JBJS, 1994;76A:664-666<br />Culture from sinus tract , purulent fluid, soft tissue & bone for aerobic /anaerobic/ fungal growth yielded organisms- <br />&gt;1 in 21/30<br />&gt;3 in 11/30<br />10 in 2/30<br />Same org. in 14/30( only in 47% )<br />Recommendation is to send all 4 specimens –to identify as many organisms as possible.<br />+ve co-relation has been found between S. aureus growth from sinus tract & that from bone culture.<br />
    16. 16. Imaging<br />X-ray<br />Sequestrum<br />Involucrum<br />Cloacae<br />Cavity<br />Irregular bone thickening <br />Pathological fracture<br />
    17. 17. CT Scan<br />To identify areas of necrotic bone/ sequestra<br />Help in establishing a surgical plan<br />MRI<br />High sensitivity & specificity for diagnosis<br />Localises abnormal bone marrow early<br />Can detect myositis, cellulitis, sinus tract formation & soft tissue abscess<br />“Rim sign”-in chronic OM is high signal intensity surrounding the focus of active disease<br />
    18. 18. Radionuclide scan<br />Used when diagnosis is ambiguous<br />Gauges extent of bone & soft tissue inflammation<br /> -99mTc<br /> - 67 Gallium citrate<br /> - 111 Indium labelled leukocytes-ideally for acute OM.<br />MRI-is much more sensitive than nuclear studies .<br />During the 1st post-op year MRI can not accurately distinguish infection from fibrovascular scar—COMBINEDNUCLEAR MEDICINE STUDIES WERE FOUND TO BE MORE USEFUL DURING THIS PERIOD<br />
    19. 19. 18FDG PET Scan<br /> Meta-analysis showed –Fluorodeoxyglucose positron emission tomography has the highest accuracy for confirming or excluding the diagnosis of Chr OM<br />“The Accuracy of Diagnostic Imaging for the Assessment of ChronicOsteomyelitis: A Systematic Review and Meta-Analysis”<br />The Journal of Bone and Joint Surgery (American). 2005;87:2464-2471.<br />
    20. 20. Cierny-Mader Staging System<br />
    21. 21. Radiologic Classification of Chronic Hematogenous<br />Osteomyelitis in Children<br />Henry Wynn Jones, FRCS (T&O), James W. Harrison, FRCS (T&O),<br />Jeremy Bates, FCS (ECSA), Gwyn A. Evans, FRCS, and Nicolas Lubega, FCS (ECSA)<br />J Pediatr Orthop Volume 29, Number 7, October/November 2009 <br />Chronic Hematogenous Osteomyelitis in Children<br />
    22. 22. Classification<br />Type A—Brodie’s abscess,<br />Type B—Sequestrum involucrum, <br /> B1-Localised cortical sequestrum<br /> B2-Sequestrum with normal /structural involucrum*<br /> B3-Sequestrum with sclerotic involucrum<br /> B4-Sequestrum without structural involucrum<br />Type C—sclerotic.<br />If proximal physis is damaged the suffix P is added If distal <br />physis is affected the suffix D is added <br />* Adequate involucrum to support wt of limb against gravity<br />
    23. 23. Beit CURE Classification of Childhood Haematogenous Chronic Osteomyelitis<br />Example of type C: sclerotic tibia.<br />Example of type A: Brodie’s abscess within a distal tibia<br />
    24. 24. Beit CURE Classification of Childhood Haematogenous Chronic Osteomyelitis<br />Example of type B1:localised cortical sequestrum of a tibia.<br />Example of type B2: sequestrum with normal structural involucrum of a proximal humerus.<br />
    25. 25. Beit CURE Classification of Childhood Haematogenous Chronic Osteomyelitis<br />Example of type B4: sequestrum with structurally inadequate involucrum of a tibia.<br /> Example of type B3: sequestrum with sclerotic involucrum of a radius.<br />
    26. 26. TREATMENT<br />MEDICAL<br />Specific antimicrobial coverage<br /> In compromised host—correct or reduce the host defect<br />SURGICAL<br />Adequate drainage<br />Debridement<br />Obliteration of dead space<br />Adequate soft tissue cover for wound protection<br />Restoration of an effective blood supply<br />
    27. 27. ANTIBIOTIC TREATMENT<br />Chronic infection develops in 19% of pt with acute osteomyelities receiving antibiotics for 3 wks or less---BUT only 2% in patients receiving longer than 3 wks<br />Cierny-Mader stage 1,3,4 require 4 - 6 wks of antibiotics (revascularisation of bone after debridement takes about 4 wks)<br />Stage 2—short course antibiotics for 2 wks following debridement of cortex/soft tissue<br />Stage 3 /4 –antibiotics for 4 to 6 wks from last major decompression/debridement<br />
    28. 28. ANTIBIOTICS<br />IV antibiotics<br />Nafcillin/oxacillin/nafcillin with rifampcin *<br />Vancomycin/ampcillin/cefazolin/ceftriaxone<br />Clindamycin/sulbactum/piperacillin/tazobactam<br />ORAL antibiotics<br />Clindamycin/rifampcin/cotrimexazole<br />Fluroquinolones in gram –ve organisms<br />Linezolid-oral & IV antibiotics—MRSA<br />
    29. 29. Not necessary to follow serum bactericidal levels-failure are due to lack of adequate surgical debridement rather than inadequate antibiotic efficiency<br /> In children the benefits of Quinolones if required are much more than toxicity to joint which is rare except in cystic fibrosis<br /> Ball p et all drug safe 1999;21:407-21<br />
    30. 30. Out Patient Parentral Antibiotic Therapy OPAT<br />51% courses associated with ADE(adverse drug event)<br />32.5% of antibiotics were discontinued because of ADE<br />Vancomycin has highest ADE rate (85.7%)<br />Ceftrixone has highest discontinuation rate of 66.7%<br />Cefazolin had the lowest rate of ADE & ADE related discontinuation rate at 0% for both<br />Leukopenia/hepatitis/rash<br />(Paediatric Infectious disease journal ,july 2009)<br />
    31. 31. OPERATIVE TREATMENT<br />Bone debridement<br />Complete removal of all infective / devascularized tissue –only solution to eradicate infection—a/b cannot reach<br />“Paprika sign” –punctate bleeding<br />Extent of operative debridement- (simpson et all)<br />&gt;5 mm wide resection-no recurrence<br />&lt;5 mm marginal resection had recurrence of 28%<br />Extent of debridement is much more important in B hosts<br /> Cortical window- at weakest area of the involucrum<br /> -connect a series of drill holes<br /> -should be oval to mimimise risk of # <br />IF INITIAL DEBRIDMENT IS IN DOUBT RETURN TO OT FOR ADDITIONAL DEBRIDEMENT<br />
    32. 32. When to do sequestrectomy? <br />Early sequestrectomy<br />- Eradicate infection<br />- Better environment for periosteum to respond <br />Delayed sequestrectomy<br /> Wait till sufficient involucrum has formed before doing a sequestrectomy to mimimize the risk of cx, fracture, deformity & segmental loss<br />In either case it is critical to preserve the involucrum preferable to wait at least 3-6 mo before performing a sequestrectomy<br />
    33. 33. SEQUESTRUM<br />
    34. 34. Post sequestrectomy<br />NO STABLISATION IS NECESSARY WHEN 70% OF THE ORIGINAL CORTEX REMAINS INTACT<br />If &gt;70% cortical volume has been retained—protect by cast<br />Greater bone loss-Ext fix<br />Focal bone loss-open cancellous BG/conventional BG<br />Seg. bone loss—BG/Bone transport/other devices<br /> Radiologically if cortical continuity of the involucrum is 50% of the over all cortical diameter on 2 orthogonal views then the involucrum is structurally adequate<br />
    35. 35. The sequestrum here is a large segment of the tibial diaphysis, and a suitable involucrum had formed posteriorly and laterally . At the time of exposure, that segment was avascular in contrast to the surrounding bone and soft tissue. The segment was easily removed.<br />
    36. 36. The failure to form an adequate involucrum will result in segmental bone loss.<br />
    37. 37. Treatment algorithm of Cierny-Mader Stage-1, or hematogenous, long-bone osteomyelitis.<br />
    38. 38. Treatment algorithm of Cierny-Mader Stage-1 long-bone osteomyelitis associated with infection at the site of hardware<br />
    39. 39. Treatment algorithm of Cierny-Mader Stage-2 long-bone osteomyelitis<br />
    40. 40. Treatment algorithm of Cierny-Mader Stages-3 and 4 long-bone osteomyelitis.<br />Osteomyelitis in long bones, L . Lazzarini,J.T.Mader,JBJS.Am.2004;86:2305-2318<br />
    41. 41. Chronic OM with segmental bone loss<br />Either partial or entire<br />Forearm/lower limb-by pass procedures may be used to restore stability—HUNTINGTON PROCEDURE & VARIANTS<br />Bone transport by illizarov is an alternative to conventional grafting<br />
    42. 42. Chronic OM with segmental bone loss<br />
    43. 43. Fibular by pass procedure-one- or two-stage transfer (Huntington procedure and variants)<br />
    44. 44. 7 yr/ F<br />No involucrum one yr after onset of the disease.<br />2 mo post sequestrectomy/ strut graft<br />
    45. 45. 8 mo- graft resorbed corticocancellous graft done<br /> 4 mo post grafting –fusion<br />
    46. 46. Chronic OM with focal bone loss<br />Small defect are managed by protection—cast or ext fixator until loss has been reconstructed<br />In young children regeneration of entire tibial shaft has been documented<br />Open cancellous bone graft-3- stage technique of papineau<br />Conventional bone grafting<br />
    47. 47. ANTIBIOTIC IMPREGNATED PMMA BEADS<br />Delivery level of antibiotic locally in conc. that exceeds the MIC<br />Local concentration of antibiotic are 200 times higher than systemic concentration<br />Leaching/elution of antibiotic<br />Heat labile/heat stable antibiotic<br />Porous high viscosity cement surface area &  elution of antibiotic<br />Aminoglycoside /cephalosporin/ clindamycin<br />Vancomycin- MRSA<br />
    48. 48. Remove beads at 6 wks- Cx is foreign body formation, on which glycocalyx forming bacteria colonise & inhibit local phagocytic immune cells<br />BIOGRADABLE ANTIBIOTIC DELIVERY SYSTEM<br /> Tobramycin-impregnated calcium sulfate <br /> pellets- only one study by Mckee<br />VAC- aids in healing of soft tissue wounds<br /> negative pressure- wound shrinkage, resorbs<br /> fluid,  granulation tissues<br />
    49. 49. RECONSTRUCTION OF BONE DEFECT & MANAGEMENT OF DEAD SPACE<br />Closed irrigation and suction system—ingress/ egress/ high volume irrigation/contamination risk/3-21 days<br />Papineau tech-open cancellous bone grafting<br />Free vascularised bone graft- fibula/ilium<br />Well vascularised local tissue flap/free flap-used to fill dead space<br />Bone transport or Illizarov technique<br />
    50. 50. SOFT TISSUE COVERAGE<br />Healing by secondary intention is to be avoided to avoid avascular scar.<br />Types-<br />Split thickness skin graft<br />Local muscle flap<br />Free vascular muscle flaps—e.g<br /> latissimus dorsi, rectus abdominus, gracilis<br />
    51. 51. Free muscle flaps<br />Free muscle or musculocutaneous flap-Advantages<br /> Dead space obliteration/coverage<br />Better & easier for filling all irregular cavities<br />Can be divided & split into exact size & form to permit transfer to bone and soft tissue defect<br />Can be easily anchored without internal fixation<br />FREE GRACILIS MS FLAP- harvested from opp. thigh based on its vascular pedicle- circumflex femoris medialis<br />60% to 100% of flap cover wounds healed compared to 40% with open cancellous bone grafting<br />
    52. 52. Resistant chronic OM (avg. procedure per pt 2.3)<br />Yeargan et al, J Pediatr Orthop , Volume 24, Number 1, January/February 2004<br />
    53. 53. Thank you<br />drvasurao85@yahoo.com<br />

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