https://radiopaedia.org/articles/ottawa-ankle-rules-1?lang=gb

Radiology is indicated if there is;

1. inability to weight bear (four steps) immediately after the injury and in emergency department

-or-

2. point tenderness at;

• posterior edge (of distal 6 cm) or tip lateral malleolus

• posterior edge (of distal 6 cm) or tip medial malleolus

• the base of the fifth metatarsal

• the navicular

https://www.healthcare.uiowa.edu/familymedicine/fpinfo/rules.2.jpg