Crossing sign (knee)
Citation, DOI, disclosures and article data
Citation:
Baardewijk L, Knipe H, B F, et al. Crossing sign (knee). Reference article, Radiopaedia.org (Accessed on 30 Sep 2023) https://doi.org/10.53347/rID-22116
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rID:
22116
Article created:
12 Mar 2013, L.J. van Baardewijk
Disclosures:
At the time the article was created L.J. van Baardewijk had no recorded disclosures.
View L.J. van Baardewijk's current disclosuresLast revised:
Disclosures:
At the time the article was last revised Henry Knipe had no recorded disclosures.
View Henry Knipe's current disclosuresRevisions:
27 times, by 11 contributors - see full revision history and disclosures
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Synonyms:
- The crossing sign
- The crossing sign of trochlear dysplasia
- Crossing sign of trochlear dysplasia
- Crossing sign - patella
- Crossing sign - knee
The crossing sign is seen on true lateral plain radiographs of the knee when the line of the trochlear groove crosses the anterior border of one of the condyle trochlea. It is a predictor of trochlear dysplasia. Trochlear dysplasia has been linked to recurrent patellar dislocation 1,2,4. The crossing sign is sensitive but not specific in diagnosing trochlear dysplasia, and has a sensitivity of 94% and a specificity of 56% 3,4.
References
- 1. Dejour H, Walch G, Neyret P et-al. [Dysplasia of the femoral trochlea]. Rev Chir Orthop Reparatrice Appar Mot. 1990;76 (1): 45-54. - Pubmed citation
- 2. Bollier M, Fulkerson JP. The role of trochlear dysplasia in patellofemoral instability. J Am Acad Orthop Surg. 2011;19 (1): 8-16. J Am Acad Orthop Surg (full text) - Pubmed citation
- 3. Donaldson OW, Heal J, Mulford J, Wakeley CJ, Eldridge JDJ. Does the plain radiograph accurately predict trochlear dysplasia. J Bone Joint Surg Br 2012 vol. 94-B no. SUPP IX 61.
- 4. Rémy F, Chantelot C, Fontaine C, Demondion X, Migaud H, Gougeon F. [Inter- and intraobserver reproducibility in radiographic diagnosis and classification of femoral trochlear dysplasia]. Surg Radiol Anat. 1998;20(4):285-9. - Pubmed citation
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