title: New Proximal Femoral Compaction Blade Provides Strong Antirotation Stability of the Femoral Head.
abstract: This study investigated the mechanical properties of a new rectangular compaction blade and compared this blade with other types of nail. Three types of nail were tested: the Magnum lag screw (Robert Reid Inc, Tokyo, Japan), proximal femoral nail, and Magnum Fid blade (Robert Reid Inc). The nails were inserted into solid rigid polyurethane foam, and the torsional moments were loaded with an Instron testing machine (Instron, Kanagawa, Japan). The force curve was recorded, and the average maximum torque was calculated from this curve. A simulation study was performed with finite element models to determine the mechanism underlying differences in rotational stability. Mechanical testing showed that the new compaction blade had stronger resistance against rotational force than the helical blade and lag screw implants. Finite element analysis also showed that the new compaction blade had stronger resistance to migration of the polyurethane foam cylinder than the other implant types. In addition, the new compaction blade had strong rotational stability. This implant should be useful for the treatment of unstable trochanteric fracture in patients with osteoporosis. [Orthopedics. 2017; 40(3):e491-e494.].
authors.forename: Shinya
authors.initials: S
authors.lastname: Hayashi
authors.forename: Yukiaki
authors.initials: Y
authors.lastname: Hirata
authors.forename: Daiki
authors.initials: D
authors.lastname: Okamoto
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kakunai
authors.forename: Shingo
authors.initials: S
authors.lastname: Hashimoto
authors.forename: Koji
authors.initials: K
authors.lastname: Takayama
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Matsumoto
authors.forename: Takahiro
authors.initials: T
authors.lastname: Niikura
authors.forename: Takaaki
authors.initials: T
authors.lastname: Fujishiro
authors.forename: Takafumi
authors.initials: T
authors.lastname: Hiranaka
authors.forename: Kotaro
authors.initials: K
authors.lastname: Nishida
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Kuroda
mesh_terms: D001858:Bone Nails; D003198:Computer Simulation; D005270:Femur Head / Q000502:physiology; D020342:Finite Element Analysis; D006801:Humans; D008422:Materials Testing; D011474:Prosthesis Design; D012399:Rotation; D019415:Torque; D054159:Torsion, Mechanical