Fig. 4.

Anteroposterior ankle radiographs of a 61-year-old female patient with pre-existing osteoporosis, bimalleolar fracture with a posterior malleolar fragment. From left to right, anteroposterior ankle radiograph after surgery, after two weeks (reduction of the fractures with two magnesium (Mg)-based screws and a titanium plate and screws), after six weeks (obvious radiolucent zones fracture consolidation), after 12 weeks (steady radiolucency, small sclerotic line at the border of the radiolucent zone to the surrounding tissue), after 24 weeks, and after 52 weeks (steady sclerotic line, increase in density at former radiolucent area). The white arrows show the gas formation arround the screw.