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Anatomical study on the relationship between the dorsal root ganglion and the intervertebral disc in the lumbar spine.

Vialle E, Vialle LR, Contreras W, Jacob C - Rev Bras Ortop (2015)

Bottom Line: The measurements obtained were constant, without significant differences between levels or any laterality.Precise localization of the ganglion shows that the safety margin for minimally invasive procedures is less than what is presented in studies that only involve measurements of the nerve root, thus perhaps explaining the presence of neuropathic pain after some of these procedures.Abstract available from the publisher.

View Article: PubMed Central - PubMed

Affiliation: Hospital Universitário Cajuru, Pontifícia Universidade Católica do Paraná, Curitiba, PR, Brazil.

ABSTRACT

Objective: To describe the location of the dorsal root ganglion in relation to the intervertebral disc, including the "triangular" safety zone for minimally invasive surgery in the lumbar spine.

Methods: Eight adult cadavers were dissected bilaterally in the lumbar region, using a posterolateral approach, so as to expose the L3L4 and L4L5 spaces, thereby obtaining measurements relating to the space between the intervertebral disc, pedicles cranial and caudal to the disc, path of the nerve root, dorsal ganglion and safety triangle.

Results: The measurements obtained were constant, without significant differences between levels or any laterality. The dorsal ganglion occupied the lateral border of the triangular safety zone in all the specimens analyzed.

Conclusion: Precise localization of the ganglion shows that the safety margin for minimally invasive procedures is less than what is presented in studies that only involve measurements of the nerve root, thus perhaps explaining the presence of neuropathic pain after some of these procedures.

No MeSH data available.


Related in: MedlinePlus

Measurements made during the study. 1, upper limit of the intervertebral disc to the axilla of the emerging root; 2, axilla of the root to the start of the dorsal ganglion; 3, lower portion of the pedicle to the dorsal ganglion; 4, green triangular area: triangular safety zone; 5, vertical distance between pedicles; 6 and 7, diameter of the DRG; 8, axilla of the root to the lower limit of the cranial intervertebral disc.
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fig0010: Measurements made during the study. 1, upper limit of the intervertebral disc to the axilla of the emerging root; 2, axilla of the root to the start of the dorsal ganglion; 3, lower portion of the pedicle to the dorsal ganglion; 4, green triangular area: triangular safety zone; 5, vertical distance between pedicles; 6 and 7, diameter of the DRG; 8, axilla of the root to the lower limit of the cranial intervertebral disc.

Mentions: Using a digital pachymeter (Mistainless®), the following measurements in millimeters were made (Table 1, Fig. 2):(1)


Anatomical study on the relationship between the dorsal root ganglion and the intervertebral disc in the lumbar spine.

Vialle E, Vialle LR, Contreras W, Jacob C - Rev Bras Ortop (2015)

Measurements made during the study. 1, upper limit of the intervertebral disc to the axilla of the emerging root; 2, axilla of the root to the start of the dorsal ganglion; 3, lower portion of the pedicle to the dorsal ganglion; 4, green triangular area: triangular safety zone; 5, vertical distance between pedicles; 6 and 7, diameter of the DRG; 8, axilla of the root to the lower limit of the cranial intervertebral disc.
© Copyright Policy - CC BY-NC-ND
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4563044&req=5

fig0010: Measurements made during the study. 1, upper limit of the intervertebral disc to the axilla of the emerging root; 2, axilla of the root to the start of the dorsal ganglion; 3, lower portion of the pedicle to the dorsal ganglion; 4, green triangular area: triangular safety zone; 5, vertical distance between pedicles; 6 and 7, diameter of the DRG; 8, axilla of the root to the lower limit of the cranial intervertebral disc.
Mentions: Using a digital pachymeter (Mistainless®), the following measurements in millimeters were made (Table 1, Fig. 2):(1)

Bottom Line: The measurements obtained were constant, without significant differences between levels or any laterality.Precise localization of the ganglion shows that the safety margin for minimally invasive procedures is less than what is presented in studies that only involve measurements of the nerve root, thus perhaps explaining the presence of neuropathic pain after some of these procedures.Abstract available from the publisher.

View Article: PubMed Central - PubMed

Affiliation: Hospital Universitário Cajuru, Pontifícia Universidade Católica do Paraná, Curitiba, PR, Brazil.

ABSTRACT

Objective: To describe the location of the dorsal root ganglion in relation to the intervertebral disc, including the "triangular" safety zone for minimally invasive surgery in the lumbar spine.

Methods: Eight adult cadavers were dissected bilaterally in the lumbar region, using a posterolateral approach, so as to expose the L3L4 and L4L5 spaces, thereby obtaining measurements relating to the space between the intervertebral disc, pedicles cranial and caudal to the disc, path of the nerve root, dorsal ganglion and safety triangle.

Results: The measurements obtained were constant, without significant differences between levels or any laterality. The dorsal ganglion occupied the lateral border of the triangular safety zone in all the specimens analyzed.

Conclusion: Precise localization of the ganglion shows that the safety margin for minimally invasive procedures is less than what is presented in studies that only involve measurements of the nerve root, thus perhaps explaining the presence of neuropathic pain after some of these procedures.

No MeSH data available.


Related in: MedlinePlus