Which option correctly pairs the species with its sacroiliac joint angle?

Which option correctly pairs the species with its sacroiliac joint angle?

• A. Equine 20 degrees; Canine 65 degrees
• B. Equine 65 degrees; Canine 65 degrees
• C. Equine 65 degrees; Canine 20 degrees
• D. Equine 20 degrees; Canine 20 degrees

Answer: (C)

The key idea is how the sacroiliac joint is oriented between the sacrum and ilium, which varies by species due to differences in pelvic structure and locomotion. In horses the pelvis is set at a more oblique angle, about 65 degrees, giving a steeper, more inclined sacroiliac joint. This orientation supports their powerful hind limbs and long stride. In dogs, the pelvis sits more horizontally and the sacroiliac joint is less inclined, around 20 degrees. So pairing Equine with 65 degrees and Canine with 20 degrees aligns with the typical anatomical arrangement in these species. The other pairings would mismatch these species-specific orientations, which is why this option is the best fit.

The key idea is how the sacroiliac joint is oriented between the sacrum and ilium, which varies by species due to differences in pelvic structure and locomotion. In horses the pelvis is set at a more oblique angle, about 65 degrees, giving a steeper, more inclined sacroiliac joint. This orientation supports their powerful hind limbs and long stride. In dogs, the pelvis sits more horizontally and the sacroiliac joint is less inclined, around 20 degrees.

So pairing Equine with 65 degrees and Canine with 20 degrees aligns with the typical anatomical arrangement in these species. The other pairings would mismatch these species-specific orientations, which is why this option is the best fit.