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  • 1
    Electronic Resource
    Electronic Resource
    Verification of the position of pedicle screws in lumbar spinal fusion (1997)
    Springer
    European spine journal 6 (1997), S. 125-128 
    Details
    ISSN: 1432-0932
    Keywords: Pedicle fixation ; Posterior spine surgery ; Lumbar spine ; Complications
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Medial or lateral pedicle screw penetration with the potential to affect neural structures in a well-known and frequent problem associated with posterior spinal fusion. We evaluated the placement of pedicle screws (n = 141) in 36 patients following posterior lumbar spinal fusion with Socon or Kluger instrumentation via a lateral transpedicular approach. The examination was based on CT and MR images performed after removal of the instrumentation, on average 1 year after implantation. We found seven pedicle screws with lateral cortical penetration of the pedicle and five screws with medial cortical penetration of the pedicle (8.5% pedicle penetration overall). No severe radicular complications accompanied these pedicle penetrations. The mean insertion angles of the pedicle screws at the L4 level were 22.6° and 23.1° for the left and the right side, respectively. At the L5 level the mean insertion angle was 20.5° on the left side and 21.5° on the right, and at the S1 level the mean angle was 16.2° on the left and 15.2° on the right. The results of this study indicate that the lateral transpedicular approach is a safe procedure for pedicle screw insertion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01358745
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A new classification of lumbar motion segments for microdiscotomy (1995)
    Springer
    European spine journal 4 (1995), S. 327-334 
    Details
    ISSN: 1432-0932
    Keywords: Microdiscotomy ; Disc classification ; Fourstep interlaminar approach ; Anatomy ; Lumbar spine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Planning and performing lumbar microdiscotomy—with or without a microscope—requires a three-dimensional understanding of the spinal canal and its surrounding structures. A new disc-related classification is helpful. Lumbar motion segments are divided into disc, infradiscal and supradiscal levels in the craniocaudal plane and into medial, paramedial and lateral zones in the horizontal plane. Traversing roots, with or without nerve root sheath, and exiting roots have specific locations to the levels and zones. A comparative study of conservatively and surgically treated patients showed that not only the size of the disc herniation but also the direction of migration of the extruded disc material has a bearing on the form of treatment that is indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300291
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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