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In vivo three‐dimensional skeletal alignment analysis of the hindfoot valgus deformity in patients with rheumatoid arthritis
Author(s) -
Liu Hongbo,
Sugamoto Kazuomi,
Itohara Tomonobu,
Tomita Tetsuya,
Hashimoto Jun,
Yoshikawa Hideki
Publication year - 2007
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.20297
Subject(s) - calcaneus , cuboid , medicine , valgus deformity , valgus , tibia , deformity , displacement (psychology) , orthodontics , navicular bone , rheumatoid arthritis , pes planus , anatomy , surgery , geometry , mathematics , psychology , psychotherapist , complication
Abstract The purpose of this study was to analyze the skeletal alignment of the hindfoot valgus deformity in patients with rheumatoid arthritis using bone models reconstructed from three‐dimensional computerized tomography data. Computed tomography was performed on 21 feet of patients with rheumatoid arthritis, and magnetic resonance imaging was taken of 10 normal feet of eight volunteers. An image processing system was used to create bone models and analyze the three‐dimensional displacement of the calcaneus, talus, navicular, and cuboid bones. With a standard coordinate system in the distal tibia and a local coordinate system in each bone of the hindfoot, three rotational parameters and three translational parameters were used to evaluate the relative displacement. The talus showed plantar flexion. Both the calcaneus and navicular bones had valgus and lateral shift displacements. However, the cuboid had no displacement relative to the calcaneus, and the navicular showed no displacement relative to the cuboid. The calcaneus, navicular, and cuboid bones have the same pattern of deformity in patients with rheumatoid arthritis. This three‐dimensional image‐based technique successfully quantified the hindfoot valgus deformity resulting from rheumatoid arthritis and is beneficial for better understanding the deformity pathomechanism. © 2006 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res