Sulcus angle (knee)
Last revised by Dr Bálint Botz ◉ on 29 Mar 2022
Citation, DOI & article data
Citation:
Lorente, E., Botz, B. Sulcus angle (knee). Reference article, Radiopaedia.org. (accessed on 05 Oct 2022) https://doi.org/10.53347/rID-77539
Permalink:
rID:
77539
Article created:
16 May 2020 by Dr Edgar Lorente ◉
Revisions:
9 times by 4 users - see full revision history
System:
Section:
Synonyms:
- Sulcal angle
- Sulcal angle (knee)
- Trochlear sulcus angle
The sulcus angle is useful in the assessment of patellofemoral instability and trochlear dysplasia.
Measurement
The angle is formed by the trochlear opening of the knee, measuring the angle between the medial and lateral facets. Classically described in axial x-rays of the knee performed at 30-45º of flexion (skyline view), it is valuable in both CT and MR studies.
Interpretation
Its normal value is 135±10º. When the angle of the groove is >145-150º, trochlear dysplasia can be diagnosed. This condition reflects an incongruence in the patella's sliding over the femoral trochlea, which can result in patellofemoral instability.
References
- 1. Diederichs G, Issever A, Scheffler S. MR Imaging of Patellar Instability: Injury Patterns and Assessment of Risk Factors. Radiographics. 2010;30(4):961-81. doi:10.1148/rg.304095755 - Pubmed
- 2. Fucentese S, von Roll A, Koch P, Epari D, Fuchs B, Schottle P. The Patella Morphology in Trochlear Dysplasia--A Comparative MRI Study. Knee. 2006;13(2):145-50. doi:10.1016/j.knee.2005.12.005 - Pubmed
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knee fractures
- ligaments
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- anterior cruciate ligament ganglion cyst
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- medial collateral ligament tear
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- tendons
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