[The temporal behavior of the anchorage of a cement-free implanted acetabular cup in animal experiments].
The mechanical qualities of the cementless press-fit cup of a hip prosthesis were examined in sheep. Primary anchorage of the cup is achieved by relative oversize of the cup in relation to the acetabulum, causing a press-fit effect. The surface of the cup consists of Sulmesh, a titanium net, which allows bony ingrowth. The quality of the mechanical anchorage in the acetabular bone was tested by measurements of the torque and cranio-caudal tilting moment needed to pull out the cup. It was shown that the secondary biological anchorage of the press-fit cup exceeds the primary mechanical anchorage (measured in previous in vitro experiments) by a factor of three. This improvement of the mechanical fixation of the press-fit cup in the acetabular bone can be explained by bony ingrowth into the Sulmesh and can be confirmed by histological findings.
Bereiter
H
H
Orthopädisch-traumatologische Abteilung, Rätischen Kantons- und Regionalspitals Chur.
Bürgi
M
M
Rahn
B A
BA
D000077:Acetabulum / Q000166:cytology / Q000000981:diagnostic imaging / Q000601:surgery*; D000818:Animals; D001696:Biomechanical Phenomena; D006622:Hip Prosthesis; D008852:Microradiography; D016348:Osseointegration; D011474:Prosthesis Design; D012756:Sheep; D014025:Titanium
D014025:Titanium
Das zeitliche Verhalten der Verankerung einer zementfrei implantierten Hüftpfanne im Tierversuch.