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Musculoskeletal Complications of Diabetes
Yicheng
Chen, HMS III
Gillian Lieberman, MD
July, 2009
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Topics
• Diabetes and MSK Facts
• Patient EH
• Neuropathic Arthropathy
• Osteomyelitis
‐
Menu of Tests
‐X‐ray
‐MRI
‐CT
‐Radionuclide Bone Scan
• Patient EH Follow‐up
• DDx: Osteomyelitis
vs. Diabetic Neuropathic Arthopathy
• Summary
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Diabetes Facts
o Affects over 23.6 million people in the US, 7.8% of the population.
o The economic cost of diabetes in 2007 was estimated to be $174 billion.
o One out of every five health dollars is spent on someone with a diagnosis of diabetes.
Data from the American Diabetes Association website: www.diabetes.org
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Common MSK Complications of Diabetes
o Osteomyelitis
o Diabetic neuropathic arthropathyo Tendonopathies
(tendonitis, tendon rupture
and tenosynovitis)
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Common MSK Complications of Diabetes
o Osteomyelitis
o Diabetic neuropathic arthropathyo Tendonopathies
(tendonitis, tendon rupture
and tenosynovitis)
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Patient EH: HPI and PMH
o Patient EH is a 45 year old male with a 20 year history of
diabetes who presents in 2005 for an evaluation of his foot
and ankle.
o He recently developed a wound and has been on intermittent
periods of antibiotics.
o He does not recall any cultures taken recently.o Physical exam shows a large wound on the lateral side of the
right foot with good granulation
tissue but which easily
probes down to the bone.
o The ankle is
edematous and erythematous.
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Patient EH: R Lateral Foot Film (March 1999)
Source: PACS, BIDMC
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Anatomy of the Foot
• Image 1 source: http://www.eorthopod.com/public/patient_education/6479/foot_anatomy.html
• Image 2 source: http://www.podcare.com/foot‐anatomy.html
Talus
Calcaneus
Navicular
Cuboid
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Patient EH: Right Lateral Foot X‐Ray
Destruction of the Destruction of the calcanealtalarcalcanealtalar
articulationarticulation
Fragmentation and sclerosis with soft Fragmentation and sclerosis with soft
tissue swellingtissue swelling
Demineralization of tarsal and Demineralization of tarsal and
metatarsal bonesmetatarsal bones
Source: PACS, BIDMC
Right Lateral Foot X‐RayThese findings are consistent with
diabetic neuropathic arthropathy.
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Overview of Diabetic Neuropathic Arthropathy
o Characterized by abnormalities in the bone, ligaments, tendons, and cartilage resulting in the
deformity of joints.
o Often involves weight bearing joints such as the ankle and midfoot.
o These abnormalities cause altered weight bearing and repetitive trauma to the area.
o Over time this results in erosion of chondral surfaces, subchondral sclerosis, joint effusions, subluxations,
dislocations, fracture and fragmentation.
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Related Terminology
• Charcot foot is often used to describe neuropathic arthropathy in diabetic patients.
• However, diabetes type I patients did not live very long in Charcot’s time (late 1800s), and diabetes type
II was very rare.
• Thus Charcot’s descriptions of “Charcot joint”
were almost exclusively patients with tabes dorsalis, as
syphilis was common in that time.
• The term diabetic neuropathic arthropathy or neuroarthropathy is often preferred.
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Pathogenesis of Neuroarthropathy
o Etiology is controversial.
o The “French theory”
believes that the joint changes are due to damage to
the trophic centers of the central nervous system that control nutrition of
the bones and joints, resulting in atrophy of osseous and articular
structures.
o The neurotramatic theory argues that loss of deep sensation and
proprioception results in relaxation of supporting structures. This allows
recurrent injuries to occur leading to malalignment, erosion of chondral
surfaces, subchondral sclerosis and eventually fracture, fragmentation
and disorganization of the joint.
o There is also evidence for the neurovascular theory, which suggests that
deficits in sympathetic vasoconstrictive tone causes hyperemia and
increased osteoclastic bone resorption.
o Likely the etiology is a combination of neurotraumatic and neurovascular
factors.
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Pathogenesis of Neuroarthropathy vs Ulcer
Source: Vinik A. Atlas of Clinical Endocrinology: Diabetes. Edited by Jay S. Skyler. ©2006 Current Medicine Group LLC.
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Different Presentations of Neuroarthropathy
o Neuroarthropathy can present in a variety of patterns:o Metatarsalphalangeal pattern
o Lisfranc patterno Talonavicular patterno Medial column pattern
o Articular disease around and dissolution of the taluso Insufficiency fractures and avulsion of the calcaneal
tuberosity
Source: Schweitzer ME, Morrison WB. MR imaging of the diabetic foot. Radiol Clin North Am. 2004 Jan;42(1):61-71, vi.
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Companion Patient 1: Neuroarthropathy on MRI
Source: Schweitzer ME, Morrison WB. MR imaging of the diabetic foot. Radiol Clin North Am. 2004 Jan;42(1):61-71, vi.
Sagittal T2‐weighted fat‐suppressed image
An example of acute neuroarthropathy with edema and enhancement of the bones around
the Lisfranc joint and intertarsal joints accompanied by periarticular enhancement and
muscle edema.
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Companion Patient 2: Neuroarthropathy on MRI
Source: Schweitzer ME, Morrison WB. MR imaging of the diabetic foot. Radiol Clin North Am. 2004 Jan;42(1):61-71, vi.
Sagittal T1‐weighted image (A)Sagittal T1‐weighted, gadolinium‐enhanced, fat‐suppressed image (C)
An example of chronic neuroarthropathy with fragmentation and subluxation of the midfoot
(arrows) and collapse of the arch of the foot. As a result of the collapsed arch, pressure and
friction of the cuboid has caused the formation of an adventitious bursa (arrowheads).
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Patient EH: Recap of HPI and PMH
o Patient EH is a 45 year old male with a 20 year history of
diabetes who presents in 2005 for an evaluation of his foot
and ankle.
o He recently developed a wound and has been on intermittent
periods of antibiotics.
o He does not recall any cultures taken recently.o Physical exam shows a large wound on the lateral side of the
right foot with good granulation
tissue but which easily
probes down to the bone.
o The ankle is
edematous and erythematous.
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o Patient EH is a 45 year old male with a 20 year history of
diabetes who presents in 2005 for an evaluation of his foot
and ankle.
o He recently developed a wound and has been on intermittent
periods of antibiotics.
o He does not recall any cultures taken recently.o Physical exam shows a large wound on the lateral side of the
right foot with good granulation
tissue but which easily
probes down to the bone.
o The ankle is
edematous and erythematous.
Patient EH: Recap of HPI and PMH
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Suspicion of Osteomyelitis
o How should we proceed with this patient? What tests should we order?
o If we suspect osteomyelitis, how should we proceed?
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Overview of Osteomyelitis
o Infection of the bone or bone marrow.
o Three main etiologies:o The bone is seeded via hematogenous spread of organisms.
o Through spread of a local infection such as cellulitis or penetrating
ulcers (very common in diabetics).
o Iatrogenic causes: hardware, surgeries etc.
o In adults the organism responsible is usually S. aureus and
occasionally Enterobacter
or Streptococcus
species.
o In diabetes, osteomyelitis should be suspected when there is
an ulcer that penetrates down to the bone.
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Menu of Tests to Evaluate Osteomyelitis
o Plain Radiographo MRI
o CTo Radionuclide Bone Scan
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First let’s look at the general advantages and disadvantages of each
modality.
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Plain Radiograph
o Advantages:o Excellent resolutiono Good visualization of osseous structures, joint spaces,
fractures, loose bodies, chondrocalcinosis, osteophytes
and enthesophytes
o Fasto Cheap
o Disadvantages:o Poor visualization of soft tissueso 2D composite of 3D structures
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MRIo Advantages:
o Good soft tissue visualizationo Great for looking at effusions, muscle edema, bone marrow
edema, tendon and ligament injuries, cysts or abscesses,
damage to cartilage, tumors and osteonecrosis
o No radiationo Disadvantages:
o Expensiveo Takes a long time
o Contraindicated in patients with certain metal implants
o Possibility of nephrogenic systemic fibrosis in patients with
renal failure
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CT
o Advantages:o 3D reconstructions availableo Great for visualizing small fractures, bone fragments,
calcifications, periosteal reactions
o With contrast can visualize cysts and some soft tissues
o Disadvantages:o More radiation
o More expensive than plain film
o Contraindicated in patients with contrast allergy or renal
failure
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Radionuclide Bone Scan
o Advantages:o Can identify areas of increased activity, i.e. neoplasms,
infections, healing fractures
o Disadvantages:o Poor resolution, limited anatomic detail
o Difficult to differentiate between the different active
processes listed above
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Modalities for Diagnosis of Osteomyelitis
o Plain radiograph has high specificity but low sensitivity. CT can
show neuroarthropathy but is not helpful in the diagnosis of
osteomyelitis. MRI is the test of choice for diagnosis of
osteomyelitis in the setting of neuroarthropathy.
o MRI has a sensitivity and a specificity over 90% for the
diagnosis of osteomyelitis. The specificity is lower in the
setting of neuroarthropathy, but it is still the modality of
choice.
Source: Schweitzer ME, Morrison WB. MR imaging of the diabetic foot. Radiol Clin North Am. 2004 Jan;42(1):61-71, vi.
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Osteomyelitis
on Plain Radiograph
o High specificity but low sensitivity.
o Often normal in the early stages of osteomyelitis.
o After two weeks, local reduction in bone density, periosteal
reaction and osteolysis may be visible.
Source: Schweitzer ME, Morrison WB. MR imaging of the diabetic foot. Radiol Clin North Am. 2004 Jan;42(1):61-71, vi.
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Companion Patient 3: Lateral Plain Film of the Left Foot
Soft Tissue GasSoft Tissue GasEnthesophytes at the attachment of the Enthesophytes at the attachment of the
Achilles tendon and the plantar fasciaAchilles tendon and the plantar fasciaLateral Left Foot X‐Ray74 year old diabetic man with suspected Osteomyelitis
Source: PACS, BIDMC
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Soft Tissue GasSoft Tissue GasEnthesophytes at the attachment of the Enthesophytes at the attachment of the
Achilles tendon and the plantar fasciaAchilles tendon and the plantar fascia
Source: PACS, BIDMC
Companion Patient 3: Lateral and AP Plain Film of the Left Foot
Possible bony destruction of Possible bony destruction of the medial 5the medial 5thth
metatarsal headmetatarsal head
Lateral Left Foot X‐Ray74 year old diabetic man with suspected Osteomyelitis
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Diagnosis of Osteomyelitis on MRI
o Low bone marrow signal on T1.
o High bone marrow signal on T2.
o Periosteal reactions can be visualized as circumferential high signal on T2 with
disproportionate enhancement.
o Secondary findings are useful to correlate with MRI, i.e. sinus tracts, skin ulceration, adjacent soft tissue infection, and periosteal reactions.
Source: Schweitzer ME, Morrison WB. MR imaging of the diabetic foot. Radiol Clin North Am. 2004 Jan;42(1):61-71, vi.
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ACR Recommendation for Patient EH
Source: ACR Appropriateness Criteria, http://acsearch.acr.org
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Follow‐up on Patient EH
o The patient already had a plain film from an outside institution that showed “significant disorganization
and disintegration of the talus which
may be either consistent with Charcot, osteomyelitis, or
a
combination of the two.”
o Cultures came back negative.
o Clinicians decided risk of osteomyelitis was low.
o The patient was scheduled for a CT to assess viability of fusion surgery.
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Patient EH: Axial CT of Right Lower Extremity
Axial C‐
CT of Right Lower Extremity
o Extensive destruction of the talus
o Soft tissue and fluid intensity in the hindfoot
o Possible small pocket of gas in the posteriomedial ankle (green arrow)
o Subluxation of talar articulation with the navicular
Portion of the talusPortion of the talus NavicularNavicular
Source: PACS, BIDMC
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Patient EH: Sagittal CT of Right Lower Extremity
Sagittal C‐
CT of Right Lower Extremity
o Destruction of tibialtalar and subtalar joints
o Destruction of talar dome and most of posterior talus
o Soft tissue and fluid intensity centered around the talus
o Fragmentation of distal tibia
o Vascular Calcification
Vascular CalcificationVascular Calcification
Source: PACS, BIDMC
Destruction of tibialtalar and subtalar Destruction of tibialtalar and subtalar
joints w/ soft tissue and fluid intensitiesjoints w/ soft tissue and fluid intensities
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Patient EH: DDx of CT Findings
o These findings may be due exclusively to neuropathic
arthropathy, but osteomyelitis cannot be ruled out, especially
with a potential gas pocket.
o It is very difficult to differentiate between acute
neuroarthropathy and osteomyelitis, especially osteomyelitis
in a patient with neuroarthropathy as they are both
destructive processes.
o Clinical correlation may be helpful: fever, deep ulcers, pus etc.
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Patient EH: DDx of CT Findings
o These findings may be due exclusively to neuropathic
arthropathy, but osteomyelitis cannot be ruled out, especially
with a potential gas pocket.
o It is very difficult to differentiate between acute
neuroarthropathy and osteomyelitis, especially
osteomyelitis in a patient with neuroarthropathy as they are
both destructive processes.
o Clinical correlation may be helpful: fever, deep ulcers, pus etc.
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Osteomyelitis vs Neuroarthropathyo Location
– Neuroarthropathy often occurs in the midfoot.
– Osteomyelitis starts distal to the Lisfranc joint or in the posterior
calcaneous, but can spread to the midfoot.
o On MRI
– Sinus tracts, replacement of soft‐tissue fat, extensive or diffuse
marrow abnormalities, thick rim enhancement or diffuse joint fluid
enhancement and joint erosion support osteomyelitis superimposed
upon neuroarthropathy.
– Abnormal joint in a diabetic foot, preservation of subcutaneous fat,
absence of soft‐tissue fluid collections, presence of subchondral cysts,
and presence of intraarticular bodies support neuroarthropathy
without infection.Sources: Schweitzer ME, Morrison WB. MR imaging of the diabetic foot. Radiol Clin North Am. 2004 Jan;42(1):61-71, vi.
Ahmadi ME, Morrison WB, Carrino JA, Schweitzer ME, Raikin SM, Ledermann HP. Neuropathic arthropathy of the foot with and without superimposed osteomyelitis: MR imaging characteristics. Radiology. 2006 Feb;238(2):622-31.
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Compantion Patient 4: Osteomyelitis in the setting of Neuroarthropathy
Source: Schweitzer ME, Morrison WB. MR imaging of the diabetic foot. Radiol Clin North Am. 2004 Jan;42(1):61-71, vi.
Coronal T2-weighted fat-suppressed image (A)Axial T1-weighted, gadolinium-enhanced, fatsuppressed image (D)
Image A shows dislocation and collapse of the talus (arrow) due to neuropathic involvement of the ankle. There is also a large joint effusion (arrowheads) and extensive surrounding bone marrow edema suggestive of Osteomyelitis.
Image D shows communication of the ankle joint and adjacent bones with a cutaneous ulcer (arrow) via sinus tracts (arrowheads).
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Now back to Patient EH, who has good granulation tissue and negative
cultures.
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Patient EH: Treatment for Neuropathic Arthopathy
o Patient EH was followed and did not have osteomyelitis. He underwent a
femoral head allogeneic graft using an intramedullary nail and external
fixation frame.
Source: PACS, BIDMCOR Right Lower Extremity X‐rays
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Patient EH: Treatment Follow‐up
o Fusion surgeries have high failure
rates in diabetics due to poor healing
and the persistence of neuropathic
risk factors for arthropathy.
o In the picture on the right the
intermedullary nail has been removed
but pieces of two fractured screws
were left in the foot.
o There is resorption of the superior
portion of the femoral head graft.
Lateral X-Ray of Right Lower ExtremitySource: PACS, BIDMC
Resorption of the superior portion Resorption of the superior portion
of the femoral head graftof the femoral head graft
Fractured portions of screwsFractured portions of screws
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Patient EH: 2 Years Later
o Patient RS presents 2 years later to the ER complaining of 4 days of fevers,
chills, edema and erythema of the right lower extremity.
o Physical exam revealed 2 large abscesses and crepitation in the ankle.
o Patient had a surgical drainage and debridement of his right lower
extremity but was healing slowly with persistence of edema and
erythema.
o 2 months after his surgery an MRI was ordered to evaluate for
osteomyelitis.
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Patient EH: Axial MRI of Right Lower Extremity
Axial MRI w/o contrast of Right Lower Extremity
o There is a 6.4cm x 4cm complex fluid collection with internal debris and
calcification.
o Possible tracking of the fluid into the medullary cavity of the distal tibia.
Source: PACS, BIDMC
Tracking of fluid into the medullary Tracking of fluid into the medullary
cavity of the distal tibiacavity of the distal tibia
Complex fluid collection with internal debris Complex fluid collection with internal debris
and calcificationand calcification
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Patient EH: MRI Findings
o The findings on MRI are strongly suggestive of osteomyelitis.
o However, clinical correlation reveals that the patient is not septic and his
wound is granulating without pus.
o An acute osteomyelitis with abscess formation usually does not exhibit
good granulation with absence of pus.
o The patient turned out not to have osteomyelitis.
o This highlights the difficulty in identifying osteomyelitis in the setting of
neuroarthropathy and the importance of both radiological and clinical
findings.
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Patient EH: MRI Findings
o The findings on MRI are strongly suggestive of osteomyelitis.
o However, clinical correlation reveals that the patient is not septic and his
wound is granulating without pus.
o An acute osteomyelitis with abscess formation usually does not exhibit
good granulation with absence of pus.
o The patient turned out not to have osteomyelitis.
o This highlights the difficulty in identifying osteomyelitis in the setting of
neuroarthropathy and the importance of both radiological and clinical
findings.
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Summary
o Diabetics are at risk for neurological and vascular abnormalities that
increase their susceptibility for traumatic and neurovascular related injury
to the bones, ligaments, tendons and cartilage of weight bearing
joints.
o Overtime, there is erosion of the chondral surface and subchondral
sclerosis followed by fracture, fragmentation, disorganization and
destruction of the joint.
o Diabetics are also at increased risk for osteomyelitis, which can resemble
neuropathic arthropathy on radiological studies.
o Diagnosis of osteomyelitis in the setting of diabetic neuroarthropathy is a
difficult task, MRI findings and clinical correlation can help.
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Acknowledgements
Thank you!
Dr. Gillian LiebermanDr. Ferris HallDr. Jim WuDr. Mary Hochman
Dr. Jen SonDr. Rich RanaDr. Sachin PandeyMaria Levantakis
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