Lumbar triangle
Trigonum lumbale
- Latin synonym: Trigonum lumbale inferius
- Synonym: Inferior lumbar triangle
- Eponym: Triangle of Petit
- Related terms: Inferior lombar triangle
Definition
The lumbar triangle (Inferior lumbar triangle; Petit's triangle), is an anatomical region located in the posterolateral aspect of the abdominal wall. It is bounded by the iliac crest inferiorly, the latissimus dorsi muscle posteriorly, and the external oblique muscle anteriorly. This triangle is clinically significant as it is a potential site for lumbar hernias, specifically inferior lumbar hernias, which are less common than superior lumbar hernias that occur in the Grynfeltt-Lesshaft triangle.
References
1.EHS and AHS Guidelines for Treatment of Primary Ventral Hernias in Rare Locations or Special Circumstances.Henriksen NA, Kaufmann R, Simons MP, et al.BJS Open. 2020;4(2):342-353. doi:10.1002/bjs5.50252.
2.The Triangles of Grynfeltt and Petit and the Lumbar Tunnel: An Anatomo-Radiologic Study.Macchi V, Porzionato A, Morra A, et al.Hernia : The Journal of Hernias and Abdominal Wall Surgery. 2017;21(3):369-376. doi:10.1007/s10029-016-1509-3.
