title: Quantifying degree of difficulty in hip - resurfacing of pistol-grip deformity.
abstract: This study used computer simulation to endeavor to quantify the relative degree of difficulty of resurfacing femora with pistol-grip deformities compared to relatively normal femora. Computer models of five pistol-grip femora and one relatively normal femur were computed from computed tomography (CT) scans of patients who had undergone computer-assisted hip resurfacing. A computer simulation of positioning the femoral resurfacing component on the femur was performed to count the number of acceptable configurations of the component on the femur. A high number of acceptable configurations implies that the surgeon has greater freedom, or greater margin for error, in implanting the component compared to a femur with a smaller number of acceptable configurations. We found that pistol-grip deformities dramatically reduce the number of acceptable configurations for valgus alignment, and that such configurations result in decreased femoral offset and increased depth of reaming.
authors: Department of Computer Science and Engineering, York University, Toronto, Ontario, Canada.
authors: Burton
authors: B
authors: Ma
authors: Stephane G
authors: SG
authors: Bergeron
authors: Heather J
authors: HJ
authors: Grant
authors: John
authors: J
authors: Rudan
authors: John
authors: J
authors: Antoniou
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000295:instrumentation / Q000379:methods*; D003198:Computer Simulation; D005270:Femur Head / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery*; D005272:Femur Neck / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008670:Metals; D008953:Models, Anatomic; D010003:Osteoarthritis / Q000000981:diagnostic imaging / Q000601:surgery*; D011474:Prosthesis Design; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
chemical_list: D008670:Metals