Ankle Fracture broken ankle lateral/medial malleolus fracture
The ankle joint is formed where the lower leg bones, the tibia and fibula, come together above the talus.  When one (or more) of the bones involved in the ankle joint are broken, it is known as an ankle fracture.
Ankle fractures usually occur as the result of “rolling” or twisting the ankle.  The fracture may involve the fibula (lateral malleolus), the tibia (medial malleolus, posterior malleolus, or tibial plafond), or both (bimalleolar ankle fracture). 
Ankle fractures are diagnosed based on a history, physical exam, and x-rays.  Patients usually report twisting or rolling the ankle.  They may or may not feel or hear a pop.  It may be difficult to bear weight on the injured ankle.
Upon physical exam, the ankle is usually bruised and swollen.  The broken bone will, of course, be tender to push on.  More severe ankle fractures may result in an obvious deformity.  When this is the case, it is important to ensure that nerves and blood vessels are not being pushed on by the broken bones.
X-rays are important not only to confirm that the ankle is broken, but to evaluate the fracture.  Fractures may be non-displaced (just a crack) or displaced.  They may involve the cartilage in the joint (intra-articular).  The mortise formed by the tibia and fibula over the talus should be inspected for evidence of widening which would indicate instability.
Non-displaced fractures of the ankle can be treated without surgery.  The ankle is placed into a cast or boot for about 6 weeks.  Weightbearing is not usually permitted until the ankle has begun to heal.  Follow-up x-rays are obtained to evaluate healing.  When the ankle has healed enough, the cast or boot is removed to allow ankle range-of-motion.  Exercises help with strength and balance as well.  Rehabilitation may be more effective under the supervision of a physical therapist or athletic trainer.
If the ankle fracture is displaced, it should be reduced (pushed back into place or “set”) as soon as possible.  Plates, screws, or other hardware may be used to hold the broken fragments in place so that the ankle can heal correctly.  This is known as open reduction-internal fixation (ORIF).
ankle x-ray anterior-posterior
ankle x-ray lateral
ankle x-ray mortise
tibia
fibula
talus
fibula fracture
lateral malleolus
medial malleolus
tibial plafond
posterior malleolus
mildly displaced lateral malleolus fracture
lateral malleolus fracture with widening of the mortise
displaced lateral malleolus fracture
after reducing and splinting
Ankle Fracture Surgery
after open reduction internal fixation (ORIF)