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Lateral mass versus hybrid construct for cervical laminectomy and fusion.

Publication ,  Journal Article
Regan, CM; Emmanuel, S; Hornik, C; Weinhold, P; Lim, MR
Published in: Orthopedics
April 2013

Spine stabilization after C3-C7 laminectomy can be accomplished with many instrumentation options. A hybrid construct using lateral mass screws from C3 to C5 and pedicle screws at C7 can potentially maximize strength and solve the spatial constraints introduced by the placement of C6 lateral mass screws and C7 pedicle screws. Seven cadaveric cervical spines from C2 to T2 were potted in a custom testing apparatus. Differential variable reluctance transducers were placed on C6 and C7 to measure linear displacement. Specimens were loaded in flexion, extension, lateral bending, and axial torque at 1.5 Nm. A wide laminectomy was then performed, and specimens were randomized to first receive either the bilateral C3-C7 lateral mass screw construct or a hybrid construct with C3-C5 lateral mass screws and C7 pedicle screws. All specimens were tested with both constructs. Normalized deformation (mean±SD) for the lateral mass screw vs the hybrid pedicle screw constructs in the sagittal plane was 7.46%±5.48% vs 5.68%±3.67%, respectively (P=.237). Coronal deformation for lateral mass screw vs the hybrid pedicle screw constructs was 19.2%±10.9% vs 13.6%±9.53% (P=.237). Axial rotation deformation for lateral mass vs pedical screw constructs was 85.9%±83.3% vs 74.7%±58.1%, respectively (P=.868). Despite data reported in the literature indicating a higher pullout strength of pedicle screws and improved strength of hybrid pedicle screw constructs compared with lateral mass screw constructs, a hybrid construct taking spatial constraints and increased danger of pedicle screw placement above C7 into account showed no improvement in motion compared with a lateral mass screw construct.

Duke Scholars

Published In

Orthopedics

DOI

EISSN

1938-2367

Publication Date

April 2013

Volume

36

Issue

4

Start / End Page

e484 / e488

Location

United States

Related Subject Headings

  • Spinal Fusion
  • Orthopedics
  • Laminectomy
  • Humans
  • Cervical Vertebrae
  • Cadaver
  • Bone Screws
  • Biomechanical Phenomena
  • 3202 Clinical sciences
  • 1103 Clinical Sciences
 

Citation

APA
Chicago
ICMJE
MLA
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Regan, C. M., Emmanuel, S., Hornik, C., Weinhold, P., & Lim, M. R. (2013). Lateral mass versus hybrid construct for cervical laminectomy and fusion. Orthopedics, 36(4), e484–e488. https://doi.org/10.3928/01477447-20130327-27
Regan, Conor M., Steven Emmanuel, Christoph Hornik, Paul Weinhold, and Moe R. Lim. “Lateral mass versus hybrid construct for cervical laminectomy and fusion.Orthopedics 36, no. 4 (April 2013): e484–88. https://doi.org/10.3928/01477447-20130327-27.
Regan CM, Emmanuel S, Hornik C, Weinhold P, Lim MR. Lateral mass versus hybrid construct for cervical laminectomy and fusion. Orthopedics. 2013 Apr;36(4):e484–8.
Regan, Conor M., et al. “Lateral mass versus hybrid construct for cervical laminectomy and fusion.Orthopedics, vol. 36, no. 4, Apr. 2013, pp. e484–88. Pubmed, doi:10.3928/01477447-20130327-27.
Regan CM, Emmanuel S, Hornik C, Weinhold P, Lim MR. Lateral mass versus hybrid construct for cervical laminectomy and fusion. Orthopedics. 2013 Apr;36(4):e484–e488.

Published In

Orthopedics

DOI

EISSN

1938-2367

Publication Date

April 2013

Volume

36

Issue

4

Start / End Page

e484 / e488

Location

United States

Related Subject Headings

  • Spinal Fusion
  • Orthopedics
  • Laminectomy
  • Humans
  • Cervical Vertebrae
  • Cadaver
  • Bone Screws
  • Biomechanical Phenomena
  • 3202 Clinical sciences
  • 1103 Clinical Sciences