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Scientific Articles   |    
Total Ankle Replacement with Use of a New Three-Component Implant
Pascal F. Rippstein, MD1; Martin Huber, MD1; J. Chris Coetzee, MD2; Florian D. Naal, MD1
1 Department of Orthopaedic Surgery, Foot and Ankle Center, Schulthess Clinic, Lengghalde 2, 8008 Zurich, Switzerland. E-mail address for P.F. Rippstein: pascal.rippstein@kws.ch
2 Minneapolis Orthopedic Sports Medicine Institute and Twin Cities Orthopedics, 4010 West 65th Street, Minneapolis, MN 55435
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Disclosure: None of the authors received payments or services, either directly or indirectly (i.e., via his or her institution), from a third party in support of any aspect of this work. One or more of the authors, or his or her institution, has had a financial relationship, in the thirty-six months prior to submission of this work, with an entity in the biomedical arena that could be perceived to influence or have the potential to influence what is written in this work. No author has had any other relationships, or has engaged in any other activities, that could be perceived to influence or have the potential to influence what is written in this work. The complete Disclosures of Potential Conflicts of Interest submitted by the authors of this work are always provided with the online version of this article at jbjs.org.

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Investigation performed at the Department of Orthopaedic Surgery, Foot and Ankle Center, Schulthess Clinic, Zurich, Switzerland

Copyright © 2011 by The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2011 Aug 03;93(15):1426-1435. doi: 10.2106/JBJS.J.00913
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Abstract

Background: 

Total ankle arthroplasty has evolved over the past decade, and newer three-component implants have demonstrated favorable clinical results and improved survivorship. The present study analyzed the clinical and radiographic results of the first 240 total ankle arthroplasties performed by the authors with one of these new three-component prostheses.

Methods: 

Two hundred and forty consecutive primary total ankle arthroplasties were performed in 233 patients (115 women and 118 men; mean age, 61.6 years) between November 2003 and October 2007 with the Mobility prosthesis. Intraoperative and postoperative complications, reoperations, and failures were recorded. The American Orthopaedic Foot & Ankle Society hindfoot score and a visual analog scale score assessment of pain were determined at each follow-up visit. Range of ankle motion was measured on functional radiographs, and the radiographs were studied to assess component positioning, radiolucencies, new bone formation, and periprosthetic bone cysts.

Results: 

Two hundred and thirty-three of the arthroplasties were available for follow-up at least one year after surgery. The mean duration of follow-up was 32.8 ± 15.3 months. There were ten intraoperative complications (4.2%) and twenty postoperative complications (8.6%). A reoperation was necessary in eighteen ankles (7.7%). Five arthroplasties (2.1%) failed at a mean of twenty-seven months after surgery. The mean American Orthopaedic Foot & Ankle Society hindfoot score improved from 48.2 to 84.1 points (p < 0.001). The mean pain level decreased from 7.7 to 1.7 points (p < 0.001). The mean total range of ankle motion improved from 19.8° to 21.9° (p < 0.001). The tibial component had a mean of 2.1° of varus and a mean posterior slope of 6.0° relative to the tibial axis. The prevalence of nonprogressive radiolucency ranged from 1.8% to 37.3% in the ten zones surrounding the tibial component, and from 0 to 2.2% in the three zones surrounding the talar component.

Conclusions: 

The short-term clinical and radiographic results after Mobility total ankle arthroplasty are encouraging and are at least comparable with those associated with other modern three-component implants. The minimum duration of follow-up of one year is short, and studies with longer follow-up are needed to confirm our findings.

Level of Evidence: 

Therapeutic Level IV. See Instructions to Authors for a complete description of levels of evidence.

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    References

    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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