title: Dynamic hip screw versus DHS blade: a biomechanical comparison of the fixation achieved by each implant in bone.
abstract: We biomechanically investigated whether the standard dynamic hip screw (DHS) or the DHS blade achieves better fixation in bone with regard to resistance to pushout, pullout and torsional stability. The experiments were undertaken in an artificial bone substrate in the form of polyurethane foam blocks with predefined mechanical properties. Pushout tests were also repeated in cadaveric femoral heads. The results showed that the DHS blade outperformed the DHS with regard to the two most important characteristics of implant fixation, namely resistance to pushout and rotational stability. We concluded that the DHS blade was the superior implant in this study.
authors.affiliation: Centre for Applied Biomedical Engineering Research, University of Limerick, Limerick, Ireland. fneill09@yahoo.com
authors.forename: F
authors.initials: F
authors.lastname: O'Neill
authors.forename: F
authors.initials: F
authors.lastname: Condon
authors.forename: T
authors.initials: T
authors.lastname: McGloughlin
authors.forename: B
authors.initials: B
authors.lastname: Lenehan
authors.forename: J C
authors.initials: JC
authors.lastname: Coffey
authors.forename: M
authors.initials: M
authors.lastname: Walsh
mesh_terms: D001696:Biomechanical Phenomena; D001860:Bone Plates; D001863:Bone Screws; D018786:Bone Substitutes; D005593:Fracture Fixation, Internal / Q000295:instrumentation* / Q000379:methods; D006620:Hip Fractures / Q000601:surgery*; D006801:Humans; D008422:Materials Testing / Q000379:methods; D011140:Polyurethanes; D011474:Prosthesis Design
chemical_list: D018786:Bone Substitutes; D011140:Polyurethanes; C028279:polyurethane foam