Variações anatômicas do nervo ciático em um grupo de cadáveres brasileiros

Brooks, Joseph Bruno Bidin; Silva, Cristiano Augusto Cruz; Soares, Sonia Aparecida; Kai, Margareth Reiko; Cabral, Richard Haltí; Fragoso, Yára Dadalti

doi:10.1590/s1806-00132011000400009

Cited by 9 publications

(1 citation statement)

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“…Almost a similar type of finding was noted by Sinha et al who researched on 100 Indian cadavers and showed 85% type-a, 9% type-b, 3% type-c, and 3% type-d relations [23]. Pokorny et al, Brooks et al, Natsis et al, and Sinha et al, also found 2.2%, 10%, 0.35%, and 3% type-d relations, respectively [7,20,22,23]. Natsis et al, with their research on 290 Greek cadavers revealed 0.35% extremely rare type-f relation [7].…”

Section: Discussionsupporting

confidence: 67%

Composite Anatomical Variations between the Sciatic Nerve and the Piriformis Muscle: A Nepalese Cadaveric Study

Jha

Baral

2020

Case Reports in Neurological Medicine

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Piriformis syndrome is a rare syndrome which is one of the main causes of nondiscogenic sciatica causing severe low back pain due to entrapment of sciatic nerve either by the hypertrophy or by inflammation of the piriformis muscle. We have carried out dissection in 20 Nepalese cadavers. Out of 40 dissected gluteal regions, 37 exhibited typical appearance of sciatic nerve, piriformis muscle, and their relations resembling type-a, whereas 3 gluteal regions showed composite structural variations resembling type-b and type-c based on Beaton and Anson’s classification. Knowledge pertaining to such variations will be helpful during a surgical intervention in the gluteal region and in turn reduces the risk of injuring these nerves which are more susceptible to damage. Our study reports such variations in Nepalese population which will be helpful during evaluation of the pain induction in various test positions and also useful for analysis of the range of the neurological deficiency in sciatic nerve neuropathies. The present study also explains the basis of the unsuccessful attempt of the sciatic nerve block during popliteal block anaesthesia.

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Section: Discussionsupporting

confidence: 67%

Composite Anatomical Variations between the Sciatic Nerve and the Piriformis Muscle: A Nepalese Cadaveric Study

Jha

Baral

2020

Case Reports in Neurological Medicine

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Surgical anatomy of the sciatic nerve: A meta‐analysis

Tomaszewski

Graves

Henry

et al. 2016

Journal Orthopaedic Research

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The sciatic nerve has varying anatomy with respect to the piriformis muscle. Understanding this variant anatomy is vital to avoiding iatrogenic nerve injuries. A comprehensive electronic database search was performed to identify articles reporting the prevalence of anatomical variations or morphometric data of the sciatic nerve. The data found was extracted and pooled into a meta-analysis. A total of 45 studies (n = 7068 lower limbs) were included in the meta-analysis on the sciatic nerve variations with respect to the piriformis muscle. The normal Type A variation, where the sciatic nerve exits the pelvis as a single entity below the piriformis muscle, was most common with a pooled prevalence of 85.2% (95%CI: 78.4-87.0). This was followed by Type B with a pooled prevalence of 9.8% (95%CI: 6.5-13.2), where the sciatic nerve bifurcated in the pelvis with the exiting common peroneal nerve piercing, and the tibial nerve coursing below the piriformis muscle. In morphometric analysis, we found that the pooled mean width of the sciatic nerve at the lower margin of the piriformis muscle was 15.55 mm. The pooled mean distance of sciatic nerve bifurcation from the popliteal fossa was 65.43 mm. The sciatic nerve deviates from its normal course of pelvic exit in almost 15% of cases. As such we recommend that a thorough assessment of sciatic nerve variants needs to be considered when performing procedures in the pelvic and gluteal regions in order to reduce the risk of iatrogenic injury. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 34:1820-1827, 2016.

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