Sulcus angle

The sulcus angle is derived from the Merchant view X-ray, or from MRI or CT scans.

• The sulcus angle in trochlear dysplasia

The sulcus angle in trochlear dysplasia

The sulcus angle measurement would be made in patients being investigated for the cause of instability of the patella.

Peer-reviewed paper

• Quote from peer-reviewed paper:

  "....a sulcus angle measuring more than 145° in a Merchant view knee radiograph with the knee in 45° knee flexion and the beam at 30° inclination caudal down the patellar femoral joint is characteristic of trochlear dysplasia"

  Citation: Kazley JM, Banerjee S. Classifications in Brief: The Dejour Classification of Trochlear Dysplasia. Clin Orthop Relat Res. 2019 Oct;477(10):2380-2386. doi: 10.1097/CORR.0000000000000886. PMID: 31393338; PMCID: PMC6999944.

End of paper Quick links

• Trochlear dysplasia

• Patellar instability

End of links

Back to top