The inferior lumbar triangle, or Petit triangle, is a small gap just above the iliac crest at the side of the back. It is bounded by the iliac crest below, latissimus dorsi behind and the external oblique in front, with internal oblique forming its floor.
| Location | Lower lateral back, just above the iliac crest. |
|---|---|
| Boundaries |
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A natural weak area of the posterolateral abdominal wall, used as a landmark for abdominal wall blocks.
It is a site of rare lumbar hernias and a landmark for the transversus abdominis plane block, where anaesthetic is injected between internal oblique and transversus abdominis. Hernias here can follow iliac crest bone graft harvest.
A hernia through the inferior lumbar triangle just above the iliac crest, presenting as a flank lump that may cause back pain.
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