The main advantage of a focal dome osteotomy over a straight closing wedge osteotomy for correcting a long-bone angular deformity is:
- A Correction occurs exactly at the CORA, giving complete correction with maximal bony contact ✓
- B It avoids any need for internal fixation
- C It can be performed entirely percutaneously in adults
- D It shortens the bone while correcting angulation
Correct answer: A. Correction occurs exactly at the CORA, giving complete correction with maximal bony contact
Explanation
B focal dome osteotomy is a curved cut centred on the true centre of rotation of angulation, so a single rotation of the fragment corrects the entire angulation at its apex. Because the cut follows a circular arc, translation does not occur and the broad curved surfaces give excellent contact for healing. B straight wedge away from the CORA creates secondary translation. Internal fixation is still required, percutaneous completion is not guaranteed, and the dome design avoids rather than causes shortening.
Reference: Principles of Deformity Correction, 1st ed.
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Written and medically reviewed by the StethoPrep medical team.