RESEARCH - Early migration of the tibial component of the Buechel-Pappas total ankle prosthesis

December 10, 2006

Clin Orthop Relat Res. 2006 Jul;448:146-51.

Early migration of the tibial component of the buechel-pappas total ankle

prosthesis.

Department of Orthopaedics, Leiden University Medical Center, The

Netherlands. r.g.h.h.nelissen@...

Interest in mobile-bearing total ankle arthroplasty has increased in recent

years. Clinical studies show favorable but varying results, with survival

rates between 70% and 90% at 10-year followup. Design-specific differences

in early migration patterns might explain variations in the results and

modes of failure. Using radiostereometric analysis (RSA) we prospectively

followed 15 RA patients with a cementless mobile-bearing total ankle

arthroplasty. The American Orthopaedic Foot and Ankle Society ankle score

and radiostereometric radiographs were evaluated immediately

postoperatively, 6 weeks postoperatively, 3 months, 6 months, and 12 months

postoperatively and yearly thereafter. The postoperative clinical results

improved. We observed increased migration of the tibial component during the

first 3 months, but this stabilized by the 6 month followup. The mean

lateral-medial migration was 0.8 mm, distal-proximal migration was 0.9 mm,

and posteroanterior migration was -0.5 mm. The latter implies the total

resultant migration was in anterior and valgus tilting of this tibial

component. However, migration stabilized at 6 months postoperatively. We

believe the surgical technique (anterior cortical window for placement) and

the method of tibial fixation likely explain this migration. LEVEL OF

EVIDENCE: Therapeutic, Level IV. See Guidelines for Authors for a complete

description of levels of evidence.

PMID: 16826109

ctPlus & list_uids=16826109

Not an MD

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Mayo Clinic in Rochester

s Hopkins Medicine

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