This is an ankle X-ray (AP view). I can see a small fracture fragment at the tip of the lateral malleolus, meaning the outer end of the fibula.

A definite diagnosis needs the formal radiology report and usually lateral and mortise X-ray views. If there is marked swelling, inability to take four steps, numbness, a cold/pale foot, or deformity, seek urgent orthopaedic or emergency assessment. Avoid weight-bearing until reviewed.

For a small, nondisplaced lateral malleolus avulsion fracture, treatment is usually non-surgical:

This approach is consistent with guidance that stable, isolated distal-fibula fractures can be managed in a CAM boot; the AAOS guidance states that many nondisplaced lateral malleolus fractures can bear weight in a boot.

Surgery is considered if there is meaningful displacement, widening/instability of the ankle mortise, talus shift, associated ligament or medial malleolus injury, open fracture, or failure to remain aligned on follow-up.

Because the image was only one view and is a photo of an X-ray, do not decide weight-bearing or treatment from it alone. Please have an orthopaedic clinician or radiologist confirm stability. Seek urgent care if the foot becomes numb, cold/pale, severely swollen, deformed, or pain rapidly worsens.

If it is truly a small, stable, nondisplaced lateral-malleolus avulsion fracture, a plaster slab is often not necessary. A removable walking boot or functional ankle brace is commonly enough, with weight-bearing only as advised.

A backslab/cast may be used temporarily if there is:

So, do not assume no immobilization is needed based on one X-ray photo. The treating orthopaedic clinician should confirm that it is stable on proper ankle mortise/lateral or weight-bearing views. Until reviewed, limit weight-bearing, elevate it, and use crutches if painful.