Sulcus angle (knee)

Dr Henry Knipe and Dr Edgar Lorente et al.

The sulcus 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.


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.

Knee pathology

The knee is a complex synovial joint that can be affected by a range of pathologies:

Article information

rID: 77539
Section: Approach
Synonyms or Alternate Spellings:

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