What term describes the combination of rotation and sinking of P3?

• A. Rotation, sinking
• B. Dorsal rotation
• C. Lateral shift
• D. Ventral rotation

Answer: (A)

Understanding what happens to P3 in this claw disease helps here: the coffin bone not only twists (rotation) within the hoof capsule but also sinks downward toward the sole as the supporting laminae fail. The term that conveys both changes at once is the description of rotation, sinking. Rotation alone describes the angular shift of the bone, while sinking describes its downward displacement; together they capture the full deformity seen in laminitis with P3. The other options describe only parts of the change—dorsal or ventral rotation references the direction of the twist but not the vertical descent, and a lateral shift is a sideways displacement. So, the combined description best reflects the actual pathology.