Which radiographic projection helps isolate the navicular bone over the second phalanx in horses?

Which radiographic projection helps isolate the navicular bone over the second phalanx in horses?

• A. 45-degree DP
• B. Lateral
• C. 65-degree DP
• D. Skyline

Answer: (A)

The key idea is to view the navicular bone in profile with minimal superimposition from the surrounding bones. The skyline projection is specifically used to achieve this: by angling the beam and positioning the limb so the navicular bone is seen in profile against the distal phalanx, you get a clear silhouette of the navicular and can better assess its structure for disease or fractures. Standard DP views at fixed angles or a lateral view tend to stack the navicular with the second phalanx or other structures, making subtle changes harder to detect. So, for isolating the navicular over the second phalanx, the skyline projection is the most effective choice.

The key idea is to view the navicular bone in profile with minimal superimposition from the surrounding bones. The skyline projection is specifically used to achieve this: by angling the beam and positioning the limb so the navicular bone is seen in profile against the distal phalanx, you get a clear silhouette of the navicular and can better assess its structure for disease or fractures. Standard DP views at fixed angles or a lateral view tend to stack the navicular with the second phalanx or other structures, making subtle changes harder to detect. So, for isolating the navicular over the second phalanx, the skyline projection is the most effective choice.