firescan use in localization of back pain · firescan use in localization of back pain ... low back...
TRANSCRIPT
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FIRESCAN USE IN LOCALIZATION
OF BACK PAIN
26th Annual Update in PM&R
March 17, 2012
Zach Beresford, M.D.
Assistant Professor
University of Utah
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I have no financial disclosures.
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ACKNOWLEDGEMENTS
Stuart Willick, MD
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Non-specific Diagnoses
Non-specific Treatments
Non-specific Outcomes
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OUTLINE • Case Presentations
• Anatomy
MOTIVATION:
• Limitations of current
diagnosis for chronic LBP
- H&P
- Imaging modalities
• FireScan
– Description
– Pros and cons
– Retrospective data review
• Future directions
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DEMOSTRATION CASE 1
LOW BACK PAIN - FOOTBALL
• Division I offensive lineman presented with right
low back pain that was present with standing,
weight lifting and blocking, and improved with
sitting. Symptoms had been increasing since
the middle of the season and were now
interfering with performance.
• Sugar Bowl was in ten days.
• X-rays and MRI showed mild, multi-level DJD.
• Is a procedure indicated? If so, which one?
Can imaging help?
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DEMONSTRATION CASE 2
Thoracolumbar pain
• 31 yo woman with several years of left
thoracolumbar pain, worsening despite
appropriate treatment. Pain began after an
MVA.
• Exam reveals ttp paraspinals at left T-L
junction, pain with extension/rotation,
neurologic exam normal
• X-rays normal
• What do you do next?
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DEMONSTRATION CASE 3
• 18 yo female gymnast
• Chronic low back pain worse with activity,
now with increased extension-based right
lower back pain unresponsive to rest,
appropriate therapy
• History of navicular stress fracture
• X-rays normal
• Initial MRI scan normal
• What do you do next?
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DIFFERENTIAL DIAGNOSIS
Short vs Long
Sometimes the
pain generator
is obvious.
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Sometimes not
as much.
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DIFFERNTIAL DIAGNOSIS
OF AXIAL LOW BACK PAIN • Facet pain (15-40%)
• Fracture: acute or
repetitive overload Fx of
pars, pedicle, endplate)
• Spondylolysis/listhesis
• Disc pain
• Myofascial pain
• Kissing spine (Basstrup’s
disease)
• Visceral pain
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FACET JOINT ANATOMY
Posterior Oblique View
Transverse
Process
Vertebral
Body
IAP
SAP
IVD
Spinous
Process
• Formed by SAP and IAP
• Obliquely oriented in lower lumbar spine
• True synovial joint
– Articular cartilage
– Joint capsule
– Synovial membrane
– Nocioceptive fibers
– Proprioceptive fibers
Pars
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FACET JOINT ANATOMY
Facet Joint Variability
- by level
- by individual
- age/arthrosis
- presence of
transitional anatomy
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HISTORY AND PHYSICAL
UNRELIABLE FOR:
• Diagnosis of discogenic pain Schwartzer et al Spine ’95:20(17)
• Diagnosis of facetogenic pain Dreyer and Dreyfuss Arch PM&R ’96:77(3) Jackson Spine ‘88
• Diagnosis of SI joint pain Fortin et al Spine ’94:19(13) Maigne et al Spine ’96:21(16)
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FACET JOINT PAIN REFERRAL
PATTERNS ARE NOT
DIAGNOSTIC.
Mooney 1976
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IMAGING OPTIONS
• X-rays: low predictive value for posterior element pain
• MRI: low predictive value; improved anatomic resolution of posterior elements vs xray
• CT: best anatomic resolution, but low predictive value for posterior element pain
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UTILITY OF STANDARD IMAGING
• Jarvik, Deyo, Ann Int Med 2002 (Literature review)
- X-ray, CT and MRI have limited utility in the
diagnosis of facet pain.
• Saal Spine 2002 (Literature review)
- “These [standard imaging] studies alone were not
adequate for predicting the patients who would
respond to controlled diagnostic blocks of the facet
joint.”
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• Kjaer Spine 2005 (prospective, controlled,
blinded study)
- Performed MRIs on 412 40 year-olds
- ~ ½ of subjects had axial LBP
- Radiologists blinded to subject status
• Results: Poor correlation between anatomic
findings and subjects’ clinical history.
UTILITY OF STANDARD IMAGING
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FACET JOINT MRI
Facet joint synovial cyst
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CT SCANS
Facet joints have
variable anatomy;
Facet injections
can be technically
challenging.
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“MAKING THE DIAGNOSIS”
Anesthetizing the joint is the only
reliable way of assessing the facet joint
as a pain generator
Intra-articular
injection
Medial branch
block
OR
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DIAGNOSTIC POWER OF INJECTIONS
IS LIMITED BY:
• False positives (up to 40%)
– Dual block paradigm
• False negatives
• Time, cost, risk
• Technically challenging facet joint anatomy
• Not helpful for stress responses and stress
fractures of the pars, pedicles and endplates.
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Specific Diagnoses
Specific Treatments
Improved Outcomes
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INCREASE IN SPINAL
PROCEDURES PERFORMED
• Surgery, epidurals, facet joints
• Medicare data from 1991-2002:
– 5.5 % increase in LBP patients.
– 0.2% increase in charges for physical therapy
– 59.4% increase in charges for facet injections
Weiner Pain Med 2006
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OTHER IMAGING OPTIONS
• Nuclear Medicine ?
– Bone scan: high sensitivity for abnormal bone turnover, but low anatomic specificity
– Use of Tc-99m MDP (technetium-99m-methylene diphosphonate)
• calcium pyrophosphate analog
• increased deposition at sites of bone remodeling
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BONE SCANS
• Bone scan with SPECT: improved anatomic resolution (still difficult to discern level; facet vs pars vs pedicle)
– Provides 3D information
• SPECT – Single-photon emission computed tomography
LBP example
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BONE SCANS
Connolly Clin Nuc Med 2004
• Reviewed 209 bone scans in young athletes
with axial LBP
• 66/209 (32%) had uptake in the pars
interarticularis
• 36/209 (17%) had uptake elsewhere (facets,
sacral stress fractures, vertebral endplates,
pedicles, transitional pseudoarticulations
• 107/209 (51%) had no uptake
• Take Home: There are multiple causes of
axial LBP
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Bone Scan with SPECT
• 47 patients with chronic low back pain
– Randomized to 2 groups
• A: Facet injections based on bone scan
• B: Injections based on clinical evaluation
– Patients with positive bone scan had better
outcomes at 1 month
– Decreased Medicare costs from $2191 to
$1865
– Pneumaticos 2006
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FireScan
• Digitally fusion of a bone scan with SPECT to a
CT scan
(manually vs automatic)
• Called “FireScan” because areas of increased
bone turnover light up
• Advantages: sensitivity of the bone scan plus
the anatomic specificity of the CT scan
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DEMONSTRATION CASE 1
• 300 lb offensive tackle with progressive,
extension-based, right low back pain.
• Unable to localize a specific pain generator by
history, physical examination, X-rays and MRI.
• DDx: facet joint pain; SI joint pain; occult
pars/pedicle stress; disc pain; other
• Sugar Bowl is in ten days.
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FOOTBALL - FireScan
FireScan Dx: R L5-S1 facet arthrosis
axial coronal
sagittal
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DEMONSTRATION CASE 1
BACK PAIN - FOOTBALL • Treatment: Right L5-S1 facet injection with
anesthetic and steroid.
• Outcome: Pain score fell from 7/10 to 1/10.
• Resumed progressive, flexion-based core exercise
program one day after injection.
• Resumed low impact cardiovascular exercise two
days after injection.
• Resumed blocking drills six days after injection.
• Competed without limitations in 10 days.
• Helped team win 2009 Sugar Bowl.
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DEMONSTRATION CASE 2
Thoracolumbar pain
• 31 yo with extension-based left
thoracolumbar pain
• Sounds like posterior element pain
• Difficult to localize exact pain generator,
level based on available information
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CASE 2 FireScan
Thoracolumbar pain
sagittal coronal axial
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THORACOLUMBAR PAIN
• Increased uptake left T12-L1 facet joint
• Pain completely relieved with MBB
• 100% of pain relieved with RFN
• Pain returned after 9 months, positive
response to repeat RFN
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CASE 3
GYMNAST
• 18 yo gymnast
• Extension-based
right LBP
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sagittal coronal axial
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GYMNAST
• Increased uptake with fracture in right
L3 pars region
• Treatment ongoing
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Initial retrospective chart review
- 25 facet blocks (IA vs MBB) in 19 patients
- only one joint blocked at a time
• Average pre-procedure pain score: 5.0
• Average post-procedure pain score: 1.0
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INITIAL FIRESCAN CASE SERIES -
CONCLUSIONS
• A FireScan can accurately predict short-term response to a facet injection.
• A FireScan can help identify the pain generator in the posterior elements of the spine.
• The CT portion of the FireScan helps guide approach and trajectory to target structure.
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UOC Radiofrequency
Neurotomy Algorithm
• Suspected facet-mediated pain unresponsive
to at least 3 months of conservative care
• At least 2 of the following 3
– Positive FireScan
– Positive response(s) to IA facet injection
– Positive response(s) to MBB
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UTILITY OF THE FIRESCAN TO
LOCALIZE PAIN GENERATORS WITH
AXIAL SPINE PAIN
• Retrospective review of 107 cases of
recalcitrant axial spine pain in which a
FireScan was ordered.
• Preliminary data analyzed
• 50% lumbar spine; 37% cervical spine; 7%
thoracic spine; 6% sacrum.
Willick et al in progress
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FIRESCAN RETROSPECTIVE
REVIEW
• Increased uptake seen on 93% of scans.
• 12% of patients with diffuse uptake
• Most common areas of increased uptake
– Facet 81%, Disc/endplate 27%
• Other areas with increased uptake less
common
– SI joint, spinous processes, pars, posterior
spinal fusion, burst fracture
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FIRESCAN OUTCOME
REVIEW
• 92% of the FireScans assisted medical
decision making.
• 61/100 of the FireScans clearly improved
patient outcome (7 lost to follow-up).
– Targeted injections, therapy, bracing …
• 75 patients received injections
• 32 patients did not receive injections
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Retrospective Injection
Analysis
• 57 patients with facet targeted injection
– 38/57 with improved outcome (66%)
• 43 patients received facet joint steroid
injections
– VAS 4.9 -> 1.5 post procedure
• 12 patients received medial branch blocks
– VAS 5.5 -> 1.3 post procedure
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Retrospective Injection
Analysis
• 27 patients went on to radiofrequency
neurotomy
– 23/27 with significant pain relief post-
procedure
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FireScan Drawbacks
• Availability
• Cost (~$1200 per study vs $800-$1,500 per
injection vs ~$1,200-$2,000 per MRI)
• Time
• Radiation exposure
• Limited existing studies have been retrospective
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FireScan Questions
• Will it change treatment?
– Unknown ability to predict long-term response
to procedures or other treatments
– Long term response with facet steroid
injection?
– Does a negative FireScan predict poor
outcome with injection?
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FireScan Advantages
• Objective test of abnormal bone turnover
(rather than subjective test of pain).
• Improved diagnostic accuracy.
• Fewer interventional procedures, ? fewer levels
– RF drawbacks
• (?) decreased cost.
• (?) decreased time.
• CT provides best anatomic resolution: to
assess cortication around stress fractures; to
plan route of approach to target structure.
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MORE IMAGES
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Future Directions
• Does a positive FireScan predict response
to facet injections, radiofrequency
neurotomy
• Prospective studies to determine if FireScan
improves outcome, decreases costs,
number of procedures
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Other Future Directions
– PET/CT NaF: Increased resolution and sensitivity
for sites of abnormal bone turnover vs bone scan
– PET/CT 18F FDG (fluorodeoxyglucose): used in
oncology, cardiology
– More sensitive for identifying sites of inflammation
– “Low dose” Spine CT
• Prone exam, focused on spine, decreases
radiation dose
• May be able to use with PET, Bone scan with
SPECT
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FIRESCAN INDICATIONS
• Axial spine pain without radicular
component
• No red flag signs or symptoms
• Symptoms not discogenic in nature
• Failure of conservative treatment
• Pressing time concerns
• Non-diagnostic standard imaging
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CONCLUSIONS
• H&P, X-ray, CT, and MRI have low sensitivity, specificity and predictive values for the diagnosis of axial spine pain.
• Bone scans have high sensitivity but low specificity.
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CONCLUSIONS
• FireScan (Bone Scan w SPECT fused
with CT) may help localize the pain
generator in axial spine pain
• Prospective research is needed to
calculate Sensitivity/Specificity,
PPV/NPV
• Research needed to determine if
outcomes improved
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QUESTIONS?