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Degenerative SpinalDisorders
Gábor Nagy MD PhDZoltán Papp MD
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Surgical treatment of diseases of central and peripheralnervous system
•Surgery of nerves (brain, spine, peripheral nerves)•Surgery of their supporting structures (skull, spinal column)•Surgery of their blood vessels
Spine surgery (neurosurgery or orthopedic surgery)
•Decompression•Stabilisation
Neurosurgery
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•Craniocervical (occipitocervical) junction:C0-C2
•Subaxial cervical spine: C3-C7 (Th1)
•Thoracic and thoracolumbal spine: Th2-L2
•Lumbal and lumbosacral spine: (L1-)L3-S
•Cervicothoracic junction•Thoracolumbal junction
Anatomical Classification of the Spine
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•Traumatic injuries
•Tumors
•Degenerative spinal disorders
•Inflammatory disorders
•Infection (pyogen)
•Developmental anomalies
Pathological Classification of SpinalDisorders
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•Basic principles
•Radiology
•Degenerative lumbal spine
•Degenerative cervical spine
•Degenerative thoracic spine
•Craniocervical instability (rheumatoidarthritis, ankylosing spondylitis)
•Osteoporosis
Major Topics
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•Anatomic adaptation to the continous wear and tear ofthe involved structures (disc, ligaments, joints)•Leading to:
- thickening and calcification of the ligaments (spondylosis)- weakening and bulging of intervertebral disc (disc herniation)
Definition and Pathomechanism
•Causing- nerve compression
(radiculopathy ormyelopathy)
- axial pain
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•Three types of stenosis:1. Central stenosis2. Lateral recess stenosis3. Foraminal stenosis
Compression
•Compressing-nerve roots (radiculopathy)-spinal cord (myelopathy)•Acute or chronic
Aim of surgery:-to prevent further neural damage (clinical progression)-to provide optimal conditions for regeneration(neurological improvement)
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•Biomechanical: pathological movement caused byphysiological load•Clinically this leads to axial pain and stenosis
Instability
Aim of surgery:-to provide optimalconditions for conservativetreatment by decompressionand stabilisation
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Instability: Spondylolisthesis and spondylolysis
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•Multimodality management involving neurologist,rheumatologist, pain specialist, spine surgeon,physiotherapist, psychologist, functional neurosurgeon•All deal only with the consequences of degenerativedisorders, non of them are curative
•Aim of spine surgery is decompression and stabilisation•Minor decompression may be insufficient•Major decompression may lead to instability
•Conservative treatment includes medication, physiotherapy,physicotherapy, balneotherapy•Semi-conservative: radicular and facet infiltration, epidurolysis(pain specialists)•Functional neurosurgery: spinal cord stimulation, morphine pump
Principles of Treatment
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•Basic principles
•Radiology
•Degenerative lumbal spine
•Degenerative cervical spine
•Degenerative thoracic spine
•Craniocervical instability (rheumatoidarthritis, ankylosing spondylitis)
•Osteoporosis
Major Topics
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Radiological Diagnosis – X-ray
Lateral Antero-posterior Flexion-extension (functional)
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Radiological Diagnosis – CT
•Ideal for bony structures•May be sufficient for softtissues (HD: sensitivity 80-95%, specificity 68-88%)
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Limitations of CT
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Radiological Diagnosis – MRI
T2 sagittal T1 sagittal
T2 axial
T1 axial
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Radiological Diagnosis – MRI
Importance of parasagittal slices!(Foramina)
*
*
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•Basic principles
•Radiology
•Degenerative lumbal spine
•Degenerative cervical spine
•Degenerative thoracic spine
•Craniocervical instability (rheumatoidarthritis, ankylosing spondylitis)
•Osteoporosis
Major Topics
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•LBP is the second most common reason for people toseek medical attention, 15% of sick leave from work,most common cause of disability <45 yrs•Lifetime prevalence 60-90%, annual incidence 5%•1% will have radicular symptoms, 1-3% have discherniation•85% no specific diagnosis, 90% improves withoutspecific treatment within 1 month•Imaging and further studies are not helpful during thefirst 4 weeks, except ”red flags”•Bed rest beyond 4 days is not necessary, pain relief isbest achieved by nonprescription pain meds and/orspinal manipulation
Low Back Pain (LBP) and Radiculopathy
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•L2,3: iliopsoas – hipflexion•L3,4: quadriceps – kneeextension•L4,5: tibialis anterior –ankle dorsiflexion•L5: extnesor hallucislongus – great toeextnesion•S1: gastrocnemius –ankle plantarflexion•S2-4: sphincters
Radicular Symptoms – Lumbal Spine
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1. Cancer/infectionAge >50 or <20, history of cancer, unexplained weightloss,immunosuppression, UTI, IV drug abuse, fever or chills,back pain not improved with rest
2. Fracturehistory of significant trauma, prolonged use of steroids, age>70
3. Cauda equina syndrome or severe neurologicalcompromiseacute onset of urinary retention or overflow incontinence,fecal incontinence or loss of anal tone, saddle anesthesia,global or progressive weakness of muscles
These need further investigation!!!
”Red Flags”
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1. Emergency Surgery* cauda equina syndrome (24-48hrs)* acute development of motor deficit (24-72hrs)
* may be indicated if pain remains intolerable in spite ofadequate pain medication
2. Relative indicationA. *70% of radicular pain caused by lumbar disc herniation is
improved within 4 weeks without surgery* 85% within 6 weeks*thus, 5-8 weeks of waiting is advocated before surgery
B. * paresis of unknown duration is doubtful indication forsurgery
Lumbar Disc HerniationIndications for Surgery
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1. Maine Lumbal Spine StudyLong-Term Outcomes of Surgical and Nonsurgical Management of Sciatica Secondary to a Lumbar Disc Herniation: 10 Year Results from the Maine Lumbar Spine Study. Spine.30(8):927-935, 2005.
•507 patients (183 surgical, 217 non-surgical)•Prospective comparison with 10-year follow-up
•No long-term difference in terms of working ability•After surgery: better radicular pain release, better functionaloutcome, greater satisfaction
Surgery vs. ConservativeEvidence?
2. Cochrane LibrarySurgery for Lumbar Disc Prolapse The Cochrane Database of Systematic Reviews 2005 Issue 3
•Quicker improvement of pain with surgery•Long term benefit is not clear
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1. Discectomy- microdiscectomy- endoscopic discectomy- percutaneous laser discectomy
2. Discectomy+fusion (see later)- in case of instability- after 2nd recurrence
Surgery for Lumbal Disc Herniation
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Adantages of MinimallyInvasive Approaches
*Main goal is decompression of neural structures
*Without sacrificing spinal stability
*Shorter hospital stay, earlier mobilization
*Decrease blood loss & pain & septic complication etc…
Microdiscectomy
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Complications
•Recurrence (2-20%)•Failure of improvement•CSF leak•Nerve damage•Life threatening bleed•Wound infection
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Far Lateral ApproachExtraforaminal Disc Herniation
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Spinal Canal Stenosis (Lumbal)
• reduction in canal size below a critical value
• congenital
• acquired
• acquired superimposed on congenital
• facet hypertrophy
• lig. flavum hypertrophy
• protruding disc
• spondylolisthesis
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Unilateral Laminoctomy with BilateralDecompression (”Over the Top”)
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Unilateral Laminoctomy with BilateralDecompression (”Over the Top”)
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Instability – Fusion Cage
•Restitution of distance between vertebral bodies
•Alone and/or transpedicular srews
•Instant and long-standing stability
PLIF
TLIF
OLIF
ALIF
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Instability – Transpedicular Screws(Rigid Fixation)
•Makes maximal decompression possible
•Prevents all types of instability
•Ablative (adjacent levelsyndrome)
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•Basic principles
•Radiology
•Degenerative lumbal spine
•Degenerative cervical spine
•Degenerative thoracic spine
•Craniocervical instability (rheumatoidarthritis, ankylosing spondylitis)
•Osteoporosis
Major Topics
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•Myelopathy or radiculopathy•Disc herniation, OPLL, Spondylosis
Aim of Surgery•Decompression•Stabilization•Physiological curveture rewconstruction•Minimal affection of movement
Degenerative Cervical Spine
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•C4: diaphragm•C5: deltoid – armabduction•C6: biceps, extensorcarpi radialis – elbowflexion, wrist extension•C7: triceps – elbowextension•C7-8: extensordigitorum – fingerextension•C8-Th1: flexordigitorum profundus –grasp
Radicular Symptoms – Cervical Spine
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Anterior Approach
•Anterior cervicaldiscectomy and fusion(ACDF) or prosthesis(TCDR)•Corpectomy
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Anterior Cervical Discectomy and Fusion
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Anterior Cervical Discectomy and Fusion
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Total Cervical Disc Replacement (Prosthesis)
•Lafuente&Casey, 2003: 19% of thepatients underwent ACDF requeredsecond operation due to adjacentdisc disease (100 cases, 1-15 yrsfollow-up)•Aim is to preserve motion function•Contraindications:- kyphosis- facet joint arthrosis- immobility- ligamentous injury, subluxation- osteoporosis- inflammation- low compliance
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Total Cervical Disc Replacement (Prosthesis)
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Posterior Approach (Foraminotomy)
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Posterior Approach (Laminectomy+Fixation)
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Ossification of Posterior LongitudinalLigament (OPLL): Laminoplasty
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•Basic principles
•Radiology
•Degenerative lumbal spine
•Degenerative cervical spine
•Degenerative thoracic spine
•Craniocervical instability (rheumatoidarthritis, ankylosing spondylitis)
•Osteoporosis
Major Topics
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•Basic principles
•Radiology
•Degenerative lumbal spine
•Degenerative cervical spine
•Degenerative thoracic spine
•Craniocervical instability (rheumatoidarthritis, ankylosing spondylitis)
•Osteoporosis
Major Topics
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Rheumatoid Arthritis
•Prevalence: 0.8%•Spine is affected in 5-80%•Neurologic symptoms in 15%
•Atlanto-axial synovitisElongation and rupture of ligamentsInstabilityPannusVertical translocationMyelopathy
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Rheumatoid Arthritis
•Pannus
•Vertical translocation
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Rheumatoid Arthritis – Surgical Options 1.• Reponable: dorsal fixation(Goel-Harms C1-2 lateral mass screw)
ADI
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Rheumatoid Arthritis – Surgical Options 2.
• Pannus+non-reponable:Transoraldecompression +dorsal fixation
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•Basic principles
•Radiology
•Degenerative lumbal spine
•Degenerative cervical spine
•Degenerative thoracic spine
•Craniocervical instability (rheumatoidarthritis, ankylosing spondylitis)
•Osteoporosis
Major Topics
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Osteoporosis – Compression Fracture•Prevalence: demonstrated in 26% of females >50 years•Incidence: 700,000/y in USA, 30,000/y in Hungary
•Treatment:- conservative: bed rest, analgetics, rehabilitation- percutaneous vertebroplasty (PVP)- surgery is rarely indicated (only if neurological deficit or instability)
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Osteoporosis – Compression Fracture
•PVP- 90% pain release- 1-3% complication rate
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