title: Development and verification of a cementless novel tapered wedge stem for total hip arthroplasty.
abstract: Most current tapered wedge hip stems were designed based upon the original Mueller straight stem design introduced in 1977. These stems were designed to have a single medial curvature and grew laterally to accommodate different sizes. In this preclinical study, the design and verification of a tapered wedge stem using computed tomography scans of 556 patients are presented. The computer simulation demonstrated that the novel stem, designed for proximal engagement, allowed for reduced distal fixation, particularly in the 40-60 year male population. Moreover, the physical micromotion testing and finite element analysis demonstrated that the novel stem allowed for reduced micromotion. In summary, preclinical data suggest that the computed tomography based stem design described here may offer enhanced implant fit and reduced micromotion.
authors.affiliation: Stryker Orthopaedics, Mahwah, New Jersey.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Faizan
authors.affiliation: Stryker Orthopaedics, Mahwah, New Jersey.
authors.forename: Thies
authors.initials: T
authors.lastname: Wuestemann
authors.affiliation: Stryker Orthopaedics, Mahwah, New Jersey.
authors.forename: Jim
authors.initials: J
authors.lastname: Nevelos
authors.affiliation: Stryker Orthopaedics, Mahwah, New Jersey.
authors.forename: Adam C
authors.initials: AC
authors.lastname: Bastian
authors.affiliation: Western Orthopaedic Clinic, Subiaco, Western Australia, Australia.
authors.forename: Dermot
authors.initials: D
authors.lastname: Collopy
mesh_terms: D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D002484:Cementation; D003198:Computer Simulation; D020342:Finite Element Analysis; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D008953:Models, Anatomic; D011474:Prosthesis Design; D014057:Tomography, X-Ray Computed
keywords: CT based design; SOMA; finite element analysis; micromotion test; tapered wedge stem