title: Initial stability comparison of modular hip implants in synthetic femurs.
abstract: Synthetic femurs were used to assess the initial bone-implant interface stability of three total hip systems: Wright Medical Technology's Infinity smooth trochanteric module (S-TM), Infinity porous-coated trochanteric module (PC-TM), and Johnson and Johnson S-ROM with a porous surface. The hips were implanted into synthetic femurs, rigidly fixed, and subjected to internal rotation and cyclic, axial compressive loads. The results showed that all three implants achieved good initial implant stability and would be expected to permit bone ingrowth. The porous-coated implants showed greater initial implant stability with less axial micromotion compared with the smooth implants. This finding suggests that surface texture plays a role in initial stability of uncemented prostheses if the bone behaves similar to the material used in this study.
authors.affiliation: Department of Orthopedic Surgery, University of California, Irvine, USA.
authors.forename: T Q
authors.initials: TQ
authors.lastname: Lee
authors.forename: M I
authors.initials: MI
authors.lastname: Danto
authors.forename: W C
authors.initials: WC
authors.lastname: Kim
mesh_terms: D001696:Biomechanical Phenomena; D018786:Bone Substitutes / Q000009:adverse effects / Q000592:standards*; D005269:Femur; D006622:Hip Prosthesis / Q000009:adverse effects / Q000592:standards*; D006801:Humans; D007593:Joint Instability / Q000209:etiology; D008422:Materials Testing / Q000379:methods; D016348:Osseointegration; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012399:Rotation
chemical_list: D018786:Bone Substitutes