title: Bone remodeling after total hip arthroplasty with a short stemmed metaphyseal loading implant: finite element analysis validated by a prospective DEXA investigation.
abstract: In total hip arthroplasty (THA), short stemmed cementless implants are used because they are thought to stimulate physiological bone remodeling and reduce stress shielding. We performed a numerical investigation on bone remodeling after implantation of a specific short stemmed implant using finite element analysis (FEA). Overall bone mass loss was 2.8% in the entire femur. Bone mass decrease was mostly found in the proximal part of the calcar and in the greater trochanter due to the vast cross section of the implant, probably leading to stress shielding. In the diaphysis, no change in the apparent bone density was proven. The assumptions made agreed well with bone remodeling data from THA recipients who underwent dual-energy X-ray absorptiometry. However, the clinical investigation revealed a bone mass increase in the minor trochanter region that was less pronounced in the FEA. Further comparisons to other stem designs must be done to verify if the relative advantages of the investigated implant can be accepted.
authors.affiliation: Department of Orthopaedic Surgery, Hannover Medical School, Anna-von-Borries Street 1-7, 30625 Hannover, Germany. matthias.lerch@ddh-gruppe.de
authors.forename: Matthias
authors.initials: M
authors.lastname: Lerch
authors.forename: Agnes
authors.initials: A
authors.lastname: Kurtz
authors.forename: Christina
authors.initials: C
authors.lastname: Stukenborg-Colsman
authors.forename: Ingo
authors.initials: I
authors.lastname: Nolte
authors.forename: Nelly
authors.initials: N
authors.lastname: Weigel
authors.forename: Anas
authors.initials: A
authors.lastname: Bouguecha
authors.forename: Bernd A
authors.initials: BA
authors.lastname: Behrens
mesh_terms: D015502:Absorptiometry, Photon; D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D016723:Bone Remodeling; D005260:Female; D005269:Femur / Q000502:physiology*; D020342:Finite Element Analysis; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies