Horizontal acetabular sector angle

The honrizontal acetabular sector angle is a measurement used to assess the anatomy of the hip joint in dogs, in particular the lateral slope of the acetabular roof. It is determined from a 2D CT images in a transversal plane. The dog is placed in dorsal recumbency with hip joints extended, adducted, and rotated slightly internally. Measurement 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 horizontal acetabular sector angle is the angle between the ventral line of the ventral acetabular sector angle and the the dorsal line of the dorsal acetabular sector angle.

Lopez et al (2008) found that the horizontal acetabular sector angle in adult mixed-breed dogs with laxity of the hip joints was 125,0 +/- 6,5° (range 88,1 - 144,0)

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

• OA score 0: 134.41 ± 9.64°

• OA score 1: 122.61 ± 9.20°

• OA score 2: 117.68 ± 11.79°

• OA score 3: 108.89 ± 7.11°

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

• 16 weeks of age: 135.32 ± 9.98°

• 32 weeks of age: 128.58 ± 13.29°

• 104 weeks of age: 124.99 ± 13.24°