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1Principles

Champy's ideal lines of osteosynthesis for symphysis fractures

Biomechanics of the symphysis

The mandibular symphysis undergoes torsional forces (twisting) during function. Therefore, fixation strategies must take this into account. When using anything less stable than a reconstruction plate, two points of fixation should be applied.

In general, the further apart the points of fixation, the more stable the construct. For symphysis fractures, when two lag screws are applied, they should be separated as much as possible without injuring vital structures.

Illustration shows Champy’s ideal lines of osteosynthesis for symphysis fractures.