摘要:

AbstractThe femoral stems of Thompson prostheses coated with a polytetrafluoroethylene/carbon fiber composite (proplast) were studied using conventional histological examination, scanning electron microscopy and electron probe microanalysis in “successful” firm implants and in a “loose” clinically unsuccessful implant. Ingrowth was found throughout the coatings of the successful prostheses. In the most firmly fixed prosthesis the ingrowth consisted of fibrous tissue with abundant giant cells; however, no bone ingrowth was detected. There was less composite pore infilling in the unsuccessful implant. From both clinical, radiological and the studies described above, it is concluded that fibrous tissue ingrowth was a secondary stabilizing phenomenon in the proplast‐coated prosthese

ISSN:0021-9304    

DOI:10.1002/jbm.820130113

出版商:John Wiley&Sons, Inc.    

年代:1979

数据来源: WILEY

摘要:

AbstractThe release of monomer from methylmethacrylate bone cements was studied during immersion in an aqueous environment intended to simulatein vivopolymerization of the material. Monomer release from disk‐shaped specimens into an aqueous environment was assayed by gas chromatography. The simulated intracorporal polymerization was carried out under a variety of conditions intended to encompass possible clinical variables. The majority of monomer release occurred within the first 15 min of immersion. Under conditions generally recommended for commercial cements the release into aqueous media was always less than 3% of the total monomer weight. Clinically feasible options of delaying the time from onset of mixing of the cement to insertion into the host resulted in only a 0.7 wt % difference in the amount of released monomer. Measurements for a variety of monomer/powder ratios demonstrated a minimum in the amount of released monomer at a ratio of about 0.4 ml/g. In terms of unit area covered, thin specimens released less monomer than thick specimen

ISSN:0021-9304    

DOI:10.1002/jbm.820130114

出版商:John Wiley&Sons, Inc.    

年代:1979

数据来源: WILEY

摘要:

AbstractThis study investigated as a small diameter vascular replacement the tissue formed adjacent to an implanted cylindrical foreign body, heterologously transplanted. Grafts of 4 mm i.d. were grown in rabbits and transplanted to dogs as segmental carotid and femoral artery replacements. These maintained 50% patency after 3 weeks. Variables in the further development of this concept are discussed.

ISSN:0021-9304    

DOI:10.1002/jbm.820130115

出版商:John Wiley&Sons, Inc.    

年代:1979

数据来源: WILEY

ISSN:0021-9304    

DOI:10.1002/jbm.820130116

出版商:John Wiley&Sons, Inc.    

年代:1979

数据来源: WILEY

ISSN:0021-9304    

DOI:10.1002/jbm.820130101

出版商:John Wiley&Sons, Inc.    

年代:1979

数据来源: WILEY