How should the sesamoid bones appear on a tangential projection?

How should the sesamoid bones appear on a tangential projection?

• A. Free of superimposition of the first metatarsal
• B. Superimposed over the first metatarsal
• C. Distorted by metatarsal bone
• D. Not visible

Answer: (A)

In this tangential view, the goal is to visualize the plantar sesamoid bones without overlap from the first metatarsal head. By angling the beam tangential to the plantar aspect and positioning the foot so the first MTP joint is viewed in profile, the two sesamoids should appear clearly separated from the metatarsal head. This free-of-overlap view lets you assess the sesamoids for size, shape, and any fracture or bipartite condition. If the sesamoids are overlapped by the first metatarsal, the projection isn’t optimal; distortion or being invisible would also reflect improper technique. They should be visible and well defined in a proper tangential projection.

In this tangential view, the goal is to visualize the plantar sesamoid bones without overlap from the first metatarsal head. By angling the beam tangential to the plantar aspect and positioning the foot so the first MTP joint is viewed in profile, the two sesamoids should appear clearly separated from the metatarsal head. This free-of-overlap view lets you assess the sesamoids for size, shape, and any fracture or bipartite condition. If the sesamoids are overlapped by the first metatarsal, the projection isn’t optimal; distortion or being invisible would also reflect improper technique. They should be visible and well defined in a proper tangential projection.