Primary stability of cementless threaded acetabular cups at first implantation and in the case of revision regarding micromotions as indicators.
The primary stability of cementless total hip endoprosthesis is of vital importance for proximate, long-term osteointegration. The extent of micromotions between implant and acetabulum is an indicator of primary stability. Based on this hypothesis, different cementless hip joint endoprosthesis were studied with regard to their micromotions. The primary stability of nine different cementless threaded acetabular cups was studied in an experimental setup with blocks of rigid foam. The micromotions between implant and implant bearing were therefore evaluated under cyclic, sinusoidal exposure. The blocks of polymer foam were prepared according to the Paprosky defect classifications. The micromotions increased with the increasing degree of the defect with all acetabuli tested. Occasionally coefficients of over 200 μm were measured. From a defect degree of 3b according to Paprosky, the implants could no longer be appropriately placed. The exterior form of the spherical implants tended to exhibit better coefficients than the conical/parabolic implants.
Klinik für Orthopädie und Unfallchirurgie, Klinikum Freising, Deutschland. andreas_buerkner@gmx.de
Andreas
A
Bürkner
Andreas
A
Fottner
Thomas
T
Lichtinger
Wolfram
W
Teske
Tobias
T
Vogel
Volkmar
V
Jansson
Christoph
C
von Schulze Pellengahr
D000077:Acetabulum / Q000503:physiopathology* / Q000601:surgery*; D040761:Biomimetic Materials; D019544:Equipment Failure Analysis; D006621:Hip Joint / Q000503:physiopathology* / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology* / Q000601:surgery*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation; D016896:Treatment Outcome