Citation, DOI, disclosures and article data
Citation:
Feger J, Lustosa L, Jain S, et al. Ilioischial line. Reference article, Radiopaedia.org (Accessed on 29 Mar 2025) https://doi.org/10.53347/rID-77651
The ilioischial line, also known as the Köhler line, is a radiologic feature seen in the AP pelvis view and serves to assess the posterior acetabular column 1-4.
The ilioischial line takes its course along the lateral border of the obturator foramen to the medial border of the iliac wing and passes through the acetabular teardrop in normal hip joints.
If the acetabular fossa touches or medially extends the ilioischial line this is the finding of coxa profunda 2,3, which itself can be seen in different hip pathologies such as acetabular dysplasia or pincer morphology 5, and also in asymptomatic or normal hips 3.
If in addition, the femoral head is medial or close to the ilioischial line and medial to the acetabular walls this is a sign of protrusio acetabuli 4, which itself can be seen in osteoarthritis, rheumatoid arthritis, post-traumatic hip joints 4, osteogenesis imperfecta 6, or Paget disease.
Disruption of the ilioischial line indicates a posterior column fracture 1.
What is the name of line number 5?
-
1. A. L. Proenca, A. P. Caetano, L. Bogalho. Adult Hip Radiography: Lines and Angles. European Congress of Radiology - ESSR 2017. 2017. https://epos.myesr.org/poster/esr/essr2017/P-0209
-
2. Anderson L, Kapron A, Aoki S, Peters C. Coxa Profunda: Is the Deep Acetabulum Overcovered? Clin Orthop Relat Res. 2012;470(12):3375-82. doi:10.1007/s11999-012-2509-y - Pubmed
-
3. Fujii M, Nakamura T, Hara T, Nakashima Y, Iwamoto Y. Does Radiographic Coxa Profunda Indicate Increased Acetabular Coverage or Depth in Hip Dysplasia? Clin Orthop Relat Res. 2015;473(6):2056-66. doi:10.1007/s11999-014-4084-x - Pubmed
-
4. Leunig M, Nho S, Turchetto L, Ganz R. Protrusio Acetabuli: New Insights and Experience with Joint Preservation. Clinical Orthopaedics & Related Research. 2009;467(9):2241-50. doi:10.1007/s11999-009-0853-3 - Pubmed
-
5. Boone G, Pagnotto M, Walker J, Trousdale R, Sierra R. Radiographic Features Associated with Differing Impinging Hip Morphologies with Special Attention to Coxa Profunda. Clin Orthop Relat Res. 2012;470(12):3368-74. doi:10.1007/s11999-012-2539-5 - Pubmed
-
6. Violas P, Fassier F, Hamdy R, Duhaime M, Glorieux F. Acetabular Protrusion in Osteogenesis Imperfecta. J Pediatr Orthop. 2002;22(5):622-5. - Pubmed
Multiple choice questions:
Promoted articles (advertising)
Unable to process the form. Check for errors and try again.