Acetabular anteversion angle

The acetabular anteversion angle is a measurement used to assess the anatomy of the hip joint in dogs. It provides information about the dorsal femoral head coverage and is used to score coxofemoral dysplasia. It is determined from a 2D CT images in a transversal plane. The dog is placed in dorsal recumbency with pelvic limbs extended, adducted, and rotated slightly internally. Measurment is performed on three contiguous images that include an acetabular fossa, a well-defined acetabular sourcil, a round head of femur, and a fovea capitis.

The acetabular anteversion angle is the angle between a line connecting the dorsolateral and ventrolateral points of the acetabulum and a vertical line passing through the dorsolateral point of the acetabulum.

Andronescu et al (2015) published the following results for acetabular anteversion angle in relation to osteoarthritis score:

• OA score 0: 21.54 ± 4.26

• OA score 1: 16.13 ± 5.11

• OA score 2: 10.74 ± 1.76

• OA score 3: 10.05 ± 5.08

Andronescu et al. (2015) published the acetabular anteversion angle in 46 dogs with all osteoarthritis scores combined at each age:

• 16 weeks of age: 21.59 ± 4.96

• 32 weeks of age: 19.51 ± 5.45

• 104 weeks of age: 16.67 ± 6.73