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Acta Orthop. 2010 Dec;81(6):733-6. doi: 10.3109/17453674.2010.533934. Epub 2010 Nov 11.

Subsidence of callotasis zone in distraction osteogenesis after external fixator removal, measured by RSA.

Author information

1
Department of Radiology, Oslo University Hospital, Norway. ragnhild.gunderson@oslo-universitetssykehus.no

Abstract

BACKGROUND AND PURPOSE:

In clinical practice, achieved lengthening of a callotasis zone should be maintained after the external fixator has been removed. The common understanding has been that the regenerated bone may subside. To investigate this, we used high-resolution radiostereometric analysis (RSA) with accurate measurement of the lengthening zone.

PATIENTS AND METHODS:

We assessed the longitudinal subsidence of a callotasis zone after removal of the external fixator in distraction osteogenesis in 16 patients who underwent 17 segmental lengthening operations on the tibia (n = 9) or femur (n = 8). Median lengthening was 32 (6-80) mm. RSA was performed at the end of the consolidation period before the external fixation device was removed, and this was later repeated at a median time of 11 (4-32) weeks after frame removal.

RESULTS:

A minimal median longitudinal change of 0.01 (-0.28 to 0.60) mm across the lengthening zone occurred in uncomplicated cases.

INTERPRETATION:

Our results indicate that no subsidence of clinical interest occurs after external frame removal.

PMID:
21067433
PMCID:
PMC3216085
DOI:
10.3109/17453674.2010.533934
[Indexed for MEDLINE]
Free PMC Article

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