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Citation:
Gaillard F, Molinari A, Murphy A, et al. Line of Klein. Reference article, Radiopaedia.org (Accessed on 19 Mar 2024) https://doi.org/10.53347/rID-8109
The line of Klein describes an arbitrary line drawn along the superior edge of the femoral neck, which is useful in detecting early slipped upper femoral epiphysis in adolescents.
The line should normally intersect the lateral aspect of the superior femoral epiphysis. Failure of intersection can indicate slipped upper femoral epiphysis, and this radiographic finding is termed Trethowan sign 1. In very subtle cases, asymmetry between the lines of Klein may be the only way of determining a slipped upper femoral epiphysis.
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1. Yeap P & Budak M. The Pelvic Radiograph: Lines, Arcs and Stripes. Smedj. 2021;62(7):333-40. doi:10.11622/smedj.2021091 - Pubmed
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2. Sanjay M Khaladkar, Preeti Sherawat, Mansi N Jantre, Dhaval K Thakkar, VM Kulkarni. Early diagnosis of slipped capital femoral epiphysis on magnetic resonance imaging: A case report with review of literature. Medical Journal of Dr. D.Y. Patil University. 8 (1): 72. doi:10.4103/0975-2870.148855
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