TY - JOUR
T1 - Early Clinical Results of the BOX Ankle Replacement Are Satisfactory
T2 - A Multicenter Feasibility Study of 158 Ankles
AU - Giannini, Sandro
AU - Romagnoli, Matteo
AU - O'connor, John J.
AU - Catani, Fabio
AU - Nogarin, Livio
AU - Magnan, Bruno
AU - Malerba, Francesco
AU - Massari, Leo
AU - Guelfi, Marco
AU - Milano, Luigi
AU - Volpe, Antonio
AU - Rebeccato, Arturo
AU - Leardini, Alberto
PY - 2011/11
Y1 - 2011/11
N2 - A new design for a 3-part ankle replacement was developed in an effort to achieve compatibility with the naturally occurring ligaments of the ankle by allowing certain fibers to remain isometric during passive motion. In order to test the design concept clinically, 158 prostheses were implanted in 156 patients within a 9-center trial and were followed up for a mean of 17 (range 6 to 48) months. The mean age at the time of surgery was 60.5 (range 29.7 to 82.5) years. Outcome measures included the American Orthopaedic Foot & Ankle Surgery hindfoot-ankle score and range of motion measured on lateral radiographs of the ankle. The preoperative American Orthopaedic Foot & Ankle Surgery score of 36.3 rose to 74.6, 78.6, 76.4, and 79.0, respectively, at 12, 24, 36, and 48 months. A significant correlation between meniscal bearing movement on the tibial component (mean 3.3 mm; range 2 to 11 mm) and range of flexion at the replaced ankle (mean 26.5°; range 14° to 53°) was observed in radiograms at extreme flexions. Two (1.3%) revisions in the second and third postoperative years necessitated component removal (neither were for implant failure), and 7 (4.4%) further secondary operations were required. The results of this investigation demonstrated that non-anatomic-shaped talar and tibial components, with a fully conforming interposed meniscal bearing, can provide safety and efficacy in the short term, although a longer follow-up period is required to more thoroughly evaluate this ankle implant.
AB - A new design for a 3-part ankle replacement was developed in an effort to achieve compatibility with the naturally occurring ligaments of the ankle by allowing certain fibers to remain isometric during passive motion. In order to test the design concept clinically, 158 prostheses were implanted in 156 patients within a 9-center trial and were followed up for a mean of 17 (range 6 to 48) months. The mean age at the time of surgery was 60.5 (range 29.7 to 82.5) years. Outcome measures included the American Orthopaedic Foot & Ankle Surgery hindfoot-ankle score and range of motion measured on lateral radiographs of the ankle. The preoperative American Orthopaedic Foot & Ankle Surgery score of 36.3 rose to 74.6, 78.6, 76.4, and 79.0, respectively, at 12, 24, 36, and 48 months. A significant correlation between meniscal bearing movement on the tibial component (mean 3.3 mm; range 2 to 11 mm) and range of flexion at the replaced ankle (mean 26.5°; range 14° to 53°) was observed in radiograms at extreme flexions. Two (1.3%) revisions in the second and third postoperative years necessitated component removal (neither were for implant failure), and 7 (4.4%) further secondary operations were required. The results of this investigation demonstrated that non-anatomic-shaped talar and tibial components, with a fully conforming interposed meniscal bearing, can provide safety and efficacy in the short term, although a longer follow-up period is required to more thoroughly evaluate this ankle implant.
KW - AOFAS hindfoot-ankle score
KW - Prosthesis
KW - Range of motion
KW - Revision
KW - Surgery
KW - Talus
KW - Tibia
KW - Total ankle replacement
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U2 - 10.1053/j.jfas.2011.06.003
DO - 10.1053/j.jfas.2011.06.003
M3 - Article
C2 - 21840736
AN - SCOPUS:80054936210
VL - 50
SP - 641
EP - 647
JO - Journal of Foot and Ankle Surgery
JF - Journal of Foot and Ankle Surgery
SN - 1067-2516
IS - 6
ER -