Polymeric debris in synovium after total joint replacement: histogical identification.
J Bone Joint Surg Am
; 59(7): 860-2, 1977 Oct.
Article
em En
| MEDLINE
| ID: mdl-332700
In studying a series of synovial biopsy specimens from patients with loose joint replacements, we were able to differentiate reliably between polymethylmethacrylate and ultra high-molecular-weight polyethylene by observing alterations in their birefringence with changes in temperature. The glass transition temperature of polymethylmethacrylate (when it softens from a glass-like to a rubber-like state) is about 105 degrees centigrade. Polyethylene melts at 135 degrees centigrade. The birefringence in polyethylene returns after it has been melted and then cooled; this is not true of methylmethacrylate fragments heated above their glass transition temperature. When cooled, methacrylate fails to regain its birefringence. In addition, free particles of the two plastics were studied in vitro to validate this method of differentiation. We recommend its use routinely in histological studies of patients with loosening.
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Base de dados:
MEDLINE
Assunto principal:
Polietilenos
/
Artroplastia
/
Membrana Sinovial
/
Técnicas Histológicas
/
Articulação do Quadril
/
Metilmetacrilatos
Tipo de estudo:
Diagnostic_studies
Limite:
Humans
Idioma:
En
Ano de publicação:
1977
Tipo de documento:
Article