title: Comparison of internal fixations for distal clavicular fractures based on loading tests and finite element analyses.
abstract: It is difficult to apply strong and stable internal fixation to a fracture of the distal end of the clavicle because it is unstable, the distal clavicle fragment is small, and the fractured region is near the acromioclavicular joint. In this study, to identify a superior internal fixation method for unstable distal clavicular fracture, we compared three types of internal fixation (tension band wiring, scorpion, and LCP clavicle hook plate). Firstly, loading tests were performed, in which fixations were evaluated using bending stiffness and torsional stiffness as indices, followed by finite element analysis to evaluate fixability using the stress and strain as indices. The bending and torsional stiffness were significantly higher in the artificial clavicles fixed with the two types of plate than in that fixed by tension band wiring (P < 0.05). No marked stress concentration on the clavicle was noted in the scorpion because the arm plate did not interfere with the acromioclavicular joint, suggesting that favorable shoulder joint function can be achieved. The stability of fixation with the LCP clavicle hook plate and the scorpion was similar, and plate fixations were stronger than fixation by tension band wiring.
authors.affiliation: Department of Medical Engineering and Technology, School of Allied Health Sciences, Kitasato University, 1-15-1 Kitasato, Minami Ku, Sagamihara, Kanagawa 252-0373, Japan.
authors.forename: Rina
authors.initials: R
authors.lastname: Sakai
authors.affiliation: Department of Orthopedic Surgery, Kitasato University, 1-15-1 Kitasato, Minami Ku, Sagamihara, Kanagawa 252-0373, Japan.
authors.forename: Terumasa
authors.initials: T
authors.lastname: Matsuura
authors.affiliation: Graduate School of Medical Science, Kitasato University, 1-15-1 Kitasato, Minami Ku, Sagamihara, Kanagawa 252-0373, Japan.
authors.forename: Kensei
authors.initials: K
authors.lastname: Tanaka
authors.affiliation: Department of Orthopedic Surgery, Kitasato University, 1-15-1 Kitasato, Minami Ku, Sagamihara, Kanagawa 252-0373, Japan.
authors.forename: Kentaro
authors.identifier: 0000-0001-5148-914X
authors.initials: K
authors.lastname: Uchida
authors.affiliation: Graduate School of Medical Science, Kitasato University, 1-15-1 Kitasato, Minami Ku, Sagamihara, Kanagawa 252-0373, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Nakao
authors.affiliation: Department of Medical Engineering and Technology, School of Allied Health Sciences, Kitasato University, 1-15-1 Kitasato, Minami Ku, Sagamihara, Kanagawa 252-0373, Japan.
authors.forename: Kiyoshi
authors.identifier: 0000-0002-0325-0705
authors.initials: K
authors.lastname: Mabuchi
mesh_terms: D002968:Clavicle / Q000601:surgery*; D020342:Finite Element Analysis; D005593:Fracture Fixation, Internal / Q000379:methods*; D050723:Fractures, Bone / Q000601:surgery*; D006801:Humans; D016896:Treatment Outcome