title: Lyophilized xenograft: a case series of histological analysis of biopsies.
abstract: The reconstruction of an acetabular bone defect is one of the most important aspects of revision total hip arthroplasty surgery. It can be done by the use of grafts. Therefore, many kinds of grafts may be used and lyophilized xenograft is an alternative example. The purpose of the study was to evaluate the histological findings of lyophilized bovine xenografts used in previous total hip arthroplasty revision surgery. A case series was carried out from July 2000 to April 2013 with the approval of the Hospital Ethics Committee. Fourteen subjects were analyzed. Of these, 64.3 % were female. The average age of the patients was 52.36 ± 18.55. Neoformed bone was present in 85.7 % of subjects, and constituted 61.79 % of the total bone matrix area. The diagnosis of xenograft absorption was present in 12 subjects. A strong inverse correlation between the percentage of neoformed bone and the percentage of xenograft in the total bone matrix by analysis of biopsies was found by the Pearson test (p = 0.001). No inflammatory response was found in the clinical status of the patients or in the histological analysis. Lyophilized bovine xenograft shown to be safe until the present moment, with acceptable results. Most of the cases presented new bone formation as expected (considered values greater than 30 %) and for this reason the xenograft has proven to be an osteoconductive compatible scaffold/trellis for the bone ingrowth. Therefore, it can be considered an alternative to other bone grafts in the treatment of bone loss.
authors.affiliation: Programa de Pós-Graduação em Medicina, Cirurgia - Universidade Federal do Rio Grande do Sul (UFRGS), Rua Ramiro Barcelos, 2350, Porto Alegre, Rio Grande do Sul (RS), CEP 90035-903, Brazil.
authors.forename: Tiango Aguiar
authors.initials: TA
authors.lastname: Ribeiro
authors.forename: Caroline
authors.initials: C
authors.lastname: Coussirat
authors.forename: Fernando
authors.initials: F
authors.lastname: Pagnussato
authors.forename: Cristiano Valter
authors.initials: CV
authors.lastname: Diesel
authors.forename: Fernando Castilla de Souza
authors.initials: FC
authors.lastname: Macedo
authors.forename: Carlos Alberto de Souza
authors.initials: CA
authors.lastname: Macedo
authors.forename: Carlos Roberto
authors.initials: CR
authors.lastname: Galia
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods; D001706:Biopsy; D016025:Bone Transplantation / Q000379:methods; D005260:Female; D005612:Freeze Drying / Q000379:methods; D064593:Heterografts; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000517:prevention & control; D012086:Reoperation / Q000379:methods; D014183:Transplantation, Heterologous / Q000379:methods