title: Measurement of local strains induced into the femur by trochanteric Gamma nail implants with one or two distal screws.
abstract: This study aims to evaluate experimentally the behaviour after fracture consolidation of two intramedullary Gamma nail implants, having one (G1) or two (G2) distal screws, respectively. Nails have been implanted into standardized synthetic femora, instrumented with strain gauges. Strains measurements, supported by finite element numerical modelling, showed that the G2 implant, although ensuring higher flexional and torsional stiffness, can lead to localized contacts that occur between the tip of the nail and the femoral endosteum. This might be one of the reasons of the complications associated with pain in the mid-portion of the thigh after implantation which has been reported in several clinical studies when Gamma nails with two distal screws are used.
authors.affiliation: DCIIM, University of Messina, Salita Sperone 31, 98166 Sant'Agata (ME), Messina, Italy.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Filardi
authors.forename: Roberto
authors.initials: R
authors.lastname: Montanini
mesh_terms: D001858:Bone Nails; D001863:Bone Screws; D003198:Computer Simulation; D004548:Elasticity; D019544:Equipment Failure Analysis; D005269:Femur / Q000503:physiopathology* / Q000601:surgery*; D005593:Fracture Fixation, Internal / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D008954:Models, Biological; D011474:Prosthesis Design; D013314:Stress, Mechanical