Medial malleolus is the projection of tibia beyond ankle joint on inner side of leg. A similar projection of fibula on outer (lateral) aspect of the leg is called lateral malleolus.
Most of fractures of medial malleolus are caused by twisting injury to ankle. It my or may not be accompanied by the injury to lateral malleolus.

The xray in picture is of 27 years old male who fell after his ankle got twisted. He had a displaced fracture of medial malleolus and the fracture was fixed with two malleolar screw.
A displaced fracture of medial malleolus would almost always require reduction and fixation.
Undisplaced fractures can be treated by cast or splint.
Patient has been put on below knee cast and is allowed to walk with help of crutches without bearing weight on the affected limb.
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lateral malleolus fracture question…..
I broke my rt. ankle in Jan. 09….non-displaced fracture, no surgery….was in a boot then aircast, out of work for 4 months….and went to physical therapy. My problem is, to this day, my ankle is still swollen (mostly on the side and through the top – but occasionally on both sides), I limp every morning – and periodically throughout the day, still have pain (both sharp and dull), my foot cramps up – like a charlie horse, and I feel like I need to crack it, but it’s painful. Any advice? What is the problem?
Pls help!
Dr Arun Pal Singh Reply:
June 16th, 2010 at 11:04 am
@LB, There could be associated ligamentous injury. See your doctor again to rule out.