The mortise view is the most informative single x‑ray projection for the ankle: an AP oblique with 15–20° internal rotation opens the tibiofibular mortise and clearly shows the distal tibia, fibula and talus. For complete evaluation, a standard three‑view series (AP, lateral and mortise) is recommended to detect fractures, displacement and syndesmotic injury.

An oblique view is an X‑ray taken with the patient or X‑ray beam rotated between frontal (AP/PA) and lateral positions, typically about 30–45°. This angled projection separates overlapping structures to better show joints, spinal facets, ribs, wrist, or chest anatomy. It helps detect fractures, dislocations, subtle bone lesions and alignment problems not visible on straight AP/PA or lateral images.

A both-ankle lateral X-ray obtains side-view radiographs of both ankles to assess bone alignment, fractures, dislocations, joint space, and surrounding soft tissues. Performed with each ankle in a true lateral position, it helps compare injuries bilaterally and often complements AP or mortise views. Preparation is minimal—remove metal and follow technologist positioning; radiation exposure is low.

An ankle X‑ray is typically performed with three views: anteroposterior (AP), lateral and mortise (a rotated AP that shows the ankle joint space). Occasionally two views are used for minor injuries, while additional or oblique views (and stress or comparative views) may be requested for complex fractures or suspected ligament injuries.

No — they aren't identical. The mortise view is a specific ankle projection in which the leg is internally rotated about 15–20° to open the tibiotalar joint and show the ankle mortise. “Oblique” is a general term for any rotated radiographic projection (often around 45°) used for various bones. Thus the mortise is a particular type of oblique view for the ankle.

The three standard foot X‑ray views are: anteroposterior (AP or dorsoplantar) — visualizes metatarsals, phalanges and tarsometatarsal alignment; lateral — shows the calcaneus, talus and longitudinal arch; and oblique — demonstrates joint spaces, metatarsal heads and lateral structures. They are often taken weight‑bearing to assess functional alignment.