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DOS Kongressen 2017 ·
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Intra-articular vs. Extra-articular Subtalar Arthrod-
esis: An Assessment of RSA Stability
Peter Buxbom, Stig Sonne-Holm, Christian Wong
Orthopedic Department, Hvidovre University Hospital
Background:
The surgical treatment of symptomatic flexible flatfoot in children
depends on the severity of the malalignment of the hind and middle foot. The
extra-articular subtalar arthrodesis (EAA) ad modum Grice is considerably less
invasive than the intra- articular triple arthrodesis (IAA), but is it just as stable?
Purpose / Aim of Study:
To assess the radiostereometric analysis (RSA) sta-
bility of the subtalar fusion in EAA and IAA.
Materials and Methods:
4-8 markers were inserted in both talus and calca-
neus, which afterwards were used to analyse the RSA. The children were cast
immobilized for 10 weeks, but allowed weight-bearing the last 5 weeks within
the cast. RSA follow-up were planned 0, 5, 10 weeks, 6 and 12 months after
surgery. RSA data were valid if CN < 150 and ME < 0.350.
Findings / Results:
Eight EAA and 10 IAA were included in the study. In the
analysis of both the EAA and the IAA group, there were considerable migration
before achieving RSA stability. One EAA and two IAA remained RSA unstable
until cast removal, but did not show signs of migration after cast removal. In this
small population we did not see considerable different healing patterns between
the two groups.
Conclusions:
In the included groups we did not see differences in RSA stability
between EAA and IAA.
No conflicts of interest reported
55.