11/8/2013 1 Pedicle Subtraction Osteotomies : A Useful Tool in Revision of Adult Spinal Deformities Munish C. Gupta, MD Professor of Orthopedic surgery Chief of Spine Service University of California, Davis Sacramento, California Las Vegas 2013 67 yo female Multiple Surgeries Severe Low back pain Decompensated coronally and sagittaly Normal neurology Smoker Morphine pump Surgical Plan ? Anterior release/resectio n and Posterior Fusion Pedicle subtraction osteotomy Vertebral Column Resection
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Pedicle Subtraction Osteotomies :
A Useful Tool in Revision of Adult Spinal
Deformities
Munish C. Gupta, MD
Professor of Orthopedic surgery
Chief of Spine Service
University of California, Davis
Sacramento, California
Las Vegas
2013
67 yo female Multiple Surgeries
Severe Low back
pain
Decompensated
coronally and
sagittaly
Normal neurology
Smoker
Morphine pump
Surgical Plan ?
Anterior
release/resectio
n and Posterior
Fusion
Pedicle
subtraction
osteotomy
Vertebral
Column
Resection
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PSO
Pedicle Subtraction Osteotomies
First Described by
Leong then Thomasen
Charles Heinig used it
with Decancellation of
the vertebral Body
Resection
– Spinous process
– Lamina
– Facet joint
– Pedicle
CORR vol 194 April 1985
Pedicle Subtraction Osteotomy
Indications
Technique
Pitfalls
Complications
Difference between Primary
and Revision
Indications for Pedicle
Subtraction Osteotomies
Heinig who uses this for an approach
Sagittal plane deformity
Minimal coronal plane deformity
Multiple surgeries anterior or posterior
Grade III - Partial body resection
Most suited when >20° segmental correction needed
Appropriate even through fusion
All levels of spine possible Preferable below conus
Frank Schwab, MD
Virginie Lafage, PhD
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Positioning
Table that can bend
Abdomen free
Pad all the pressure points
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Decompression
Midline laminectomy extending above and
below
Pedicle to pedicle posterior element bony
resection
Follow the nerve roots out
Osteotomy
Hollow out the body with curettes
Dissect outside the body
Ronguer the the body
Use the table for closing the osteotomy
Use temporary rods to control the
correction
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2001 2002
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2013 Pathologic Behaviour
Increasing
pelvic tilt with
increasing
kyphosis
Sagittal plane interpretation and
management deformity
PierreRoussouly • Colin Nnadi
Aims of Sagittal Plane
Realignment
Gravity line atleast through
femoral heads
Lumbar lordosis and Pelvic
incidence within 10 degrees
Pevic tilt less than 25
T1 to L5 anterior and posterior spinal fusion
64 yo male
Severe back
pain
Hard to stand
and walk
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Fused in flat back position
Flat lumbar spine
Discectomy at
L5-S1
Disc
degeneration L5-
S1
Flatback
Anterior fusion
with femoral ring
allograft
Pedicle
subtraction
osteotomy
Extension of
instrumentation
to the pelvis
Anterior L5-S1 fusion and
Pedicle subtraction osteotomy
Sagittal Decompensation
Inadequate lordosis
L5 fracture
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Pedicle Subtraction Osteotomy
Anterior L5-S1 fusion
with femoral ring allograft
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Anterior
L5-S1 and
L4-5
femoral ring
PSO L3
Correction of Lumbar Lordosis
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Pedicle Subtraction Osteotomies
Blood loss
Neurologic Compromise
Nonunion
Proximal Junctional Failure
Proximal Junctional Kyphosis in Adult Spinal Deformity After
Segmental Posterior Spinal Instrumentation and Fusion
Minimum Five-Year Follow-up
PJK at 7.8 years postop was 39%
Progressed significantly within 8-weeks postop
Risk factors
– Older age at surgery >55 years
– Combined anterior and posterior approach
The SRS outcome not adversely affected
– except the self-image domain when PJK was >20°
Kim et al. Spine • Volume 33 • Number 20 • 2008
PSO Personal Series
29 patients Checked in 2010
All revisions
Previous fusions and instrumentation
Angle of PSO correction
– Ave 39 Deg( 25-54 deg)
C7 Plumbline
– Improved from +14.4 to +6.0 cm
PSO Personal Series Infection 2 – Multiple previous surgeries and usually have
a previous infection
Pseudoarthrosis 1 – Removal of instrumentation for infection
Neurologic Deficits 6.8% permanent
weakness
– I Cauda equina resolved
– 3 Temporary Hip Flexor weakness
– 4 Lumbar radicular symptoms
– 2 patients with foot dorsiflexion weakness 4/5
not requiring AFO
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Multiple previous surgeries
Junctional
kyphosis
Pseudoarthrosis
at multiple levels
Another one
Kyphosis WR Patient
69 Years old
Worsening Back Pain
Decompensation getting worse
Unable to stand and walk
because of pain in back
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Choices
1----3 stage – Removal of cage
– posterior osteotomies and fusion T4 to the pelvis
– anterior strut or cage
2-----2 stage – Posterior osteotomies and fusion T4 to the pelvis
– Anterior removal of cage replaced with strut or cage
3-----1 stage – Posterior osteotomies and fusion T4 to pelvis
4-----None of the above
Introp Myelographic block
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Pedicle Subtraction Neurologic Complications of Lumbar Pedicle
Subtraction Osteotomy
A 10-Year Assessment
11.1% (12 of 108 pts)
Permanent deficit of 2.8% (3 of 108 pts).
Always unilateral and distal to the level of
the osteotomy.
Combination of subluxation, residual
dorsal impingement, and dural buckling.
Neuromonitoring did not detect any of the
deficits.
Buchowski et al. SPINE Volume 32, Number 20, pp 2245–2252
Neurologic Complications of Lumbar Pedicle
Subtraction Osteotomy
A 10-Year Assessment
Buchowski et al SPINE Volume 32, Number 20, pp 2245–2252
Role of Pelvic Incidence, Thoracic Kyphosis, and
Patient Factors on Sagittal Plane Correction
Following Pedicle Subtraction Osteotomy
1. LL should be 10° greater than PI.
2. LL should be 15° greater than TK.
3. The sum of PI, LL, and TK should be <or= 45°.
Rose et al. SPINE Volume 34, Number 8, pp 785–791
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Role of Pelvic Incidence, Thoracic Kyphosis, and
Patient Factors on Sagittal Plane Correction
Following Pedicle Subtraction Osteotomy
PSO success at 2 years(91% sensitivity )
– PI + LL +TK <or= 45°
Lose sagittal balance correction
– gradual progressive kyphosis of segments
cephalad to the fusion
– occasionally due to collapse of the L5–S1
disc.
Rose et al. SPINE Volume 34, Number 8, pp 785–791
Pedicle Subtraction Osteotomy (PSO) in the
Revision versus Primary Adult Spinal
Deformity (ASD) Patient: Is there a difference in
correction and complications?
Gupta. Terran, Mundis, Smith, Shaffrey, Han,
Boachie-Adjei, Lafage, Bess, Hostin, Burton,
Ames, Kebaish, Klineberg.
International Spine Study Group
Materials and Methods
A retrospective review of a large multi-center
database of 353 adult spinal deformity
– The inclusion criteria
age >18 ,either SVA > 5cm, pelvic tilt > 25 deg,
scoliosis >20 deg ,thoracic kyphosis > 60 deg
Study Population
– PSO in the lumbar spine
– complete peri-operative complications data
– one year follow-up radiographic and clinical data
Results
260 pts out of 353 pts met the inclusion
criteria.
37 patients underwent Primary PSO
223 patients underwent Revision PSO
Minimum 1 yr Follow –up
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Demographic Results
Primary Revision t-test
Mean SD Mean SD p
Age (years) 60.1 13.6 58.9 10.9 0.549
BMI
(kg/m2)
26.1 7.2 27.9 6.8 0.184
OR time
(mn) 404 127 455 145
0.114 Blood Loss
(ml) 2654 2742 2696 1945
0.924 # levels
fused
10.5 4.0 10.7 3.9 0.802
The OR time and blood loss was not statistically different