Citation, DOI, disclosures and article data
Citation:
Knipe H, Neck axis distance. Reference article, Radiopaedia.org (Accessed on 29 Mar 2024) https://doi.org/10.53347/rID-149480
Disclosures:
At the time the article was created Henry Knipe had the following disclosures:
- Radiopaedia Events Pty Ltd, Speaker fees (past)
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
These were assessed during peer review and were determined to
not be relevant to the changes that were made.
View Henry Knipe's current disclosures
Disclosures:
At the time the article was last revised Henry Knipe had the following disclosures:
- Radiopaedia Events Pty Ltd, Speaker fees (past)
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
These were assessed during peer review and were determined to
not be relevant to the changes that were made.
View Henry Knipe's current disclosures
The neck axis distance is a measurement of acetabular version, although it has only been described in one study (c.2022) 1.
Measurement
On an AP pelvic x-ray, a line (N) is drawn along the axis of the femoral neck bisecting a circle of best fit drawn around the femoral head. The neck axis distance is the measurement between the anterior and posterior acetabular walls along line N 1,2.
Interpretation
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1. Nitschke A, Petersen B, Lambert J et al. Validation of Neck Axis Distance as a Radiographic Measure for Acetabular Anteversion. J Hip Preserv Surg. 2016;3(1):72-8. doi:10.1093/jhps/hnv082 - Pubmed
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2. Welton K, Jesse M, Kraeutler M, Garabekyan T, Mei-Dan O. The Anteroposterior Pelvic Radiograph. J Bone Joint Surg. 2018;100(1):76-85. doi:10.2106/jbjs.17.00500 - Pubmed
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