Metallic subtalar arthroereisis implants can require removal. Similarly configured
bioabsorbable “interference screws” placed alternatively to metal implants may obviate
removal. Radiographic imaging may show the location and sizing of the implant, and
evaluate for implant degradation. Patients undergoing subtalar arthroereisis were
evaluated with magnetic resonance imaging (computed tomography in one patient) to
measure the size of the tarsal canal. The tarsal canal length, along with medial height
and lateral height, were assessed. The patient’s actual implant size was also noted
as well as any signs of implant degradation, bony deformation, granulomas, and so
forth. Six patients met the inclusion criteria. The range of implants used was 9 to
12 mm. The radiographic measurements of the tarsal canal were as follows: medial to
lateral length, 12.8 ± 3.4 mm; medial height, 7.3 ± 2.5 mm; and lateral height, 8.0
± 1.7 mm. Two patients underwent implant removal. No cystic or degenerative changes
were noted on plain radiographs with bioabsorbable implants. Bioabsorbable interference
screws for subtalar arthroereisis placed in the tarsal canal may still require removal,
although no detrimental changes were noted radiographically to the surrounding bony
structures. The size of the current metallic implants on the market appears larger
than the tarsal canal configuration.
Key words
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© 2007 American College of Foot and Ankle Surgeons. Published by Elsevier Inc. All rights reserved.
