Abstract
A case-control study was undertaken to identify differences in patients with flexible
flatfoot deformity who required explantation of subtalar arthroereisis compared with
those who did not. All patients who required removal of a self-locking wedge-type
subtalar arthroereisis were identified between 2002 and 2008. Propensity scores matched
22 explanted subtalar arthroereises to 44 controls (nonexplanted arthroereises), resulting
in a total of 66 implants that met all inclusion and exclusion criteria. Multivariate
logistic regression found that patients who required explantation had a greater odds
of radiographic undercorrection, determined from radiographic anteroposterior talar-first
metatarsal angles postoperatively, P = .0012, odds ratio (OR) = 1.175 (95% confidence interval [CI] 1.066 to 1.295), or
residual transverse plane–dominant deformities, as determined from radiographic calcaneocuboid
abduction angles postoperatively, P = .05, OR = 1.096 (95% CI 1.06 to 1.203). Patients with smaller postoperative anteroposterior
talocalcaneal angles had a 16.7% reduction in odds for arthroereisis explantation
(P = .0019) (95% CI 6.5% to 25.8%). Age, gender, implant size, shape, duration, implant
position, surgeon experience, and concomitant procedures were not statistically different
between the 2 groups. This study helps identify key factors that may result in subtalar
arthroereisis explantation.
Level of Clinical Evidence
Keywords
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Article info
Footnotes
Financial Disclosure: None reported.
Conflict of Interest: None reported.
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© 2011 American College of Foot and Ankle Surgeons. Published by Elsevier Inc. All rights reserved.
