Primary stability of cementless threaded acetabular cups at first implantation and in the case of revision regarding micromotions as indicators
-
Andreas Bürkner
,
Andreas Fottner
Abstract
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.
©2012 by Walter de Gruyter Berlin Boston
Articles in the same Issue
- Masthead
- Masthead
- Research Articles
- Biomechanical analysis of anterior stabilization techniques for different partial and total vertebral corpectomy defect models
- Biomechanical analysis of screw fixation vs. K-wire fixation of a slipped capital femoral epiphysis model
- Shoulder joint abduction motion test bench: A new shoulder test bench for in vitroexperiments with active muscle force simulation
- Primary stability of cementless threaded acetabular cups at first implantation and in the case of revision regarding micromotions as indicators
- Eye safety for scanning laser projection systems
- Experimental thresholds of magnetically induced currents via a figure-of-eight coil up to 25 kHz
- Simulation of the temperature elevation in children exposed to plane wave electromagnetic fields (10 MHz–1 GHz) at the ICNIRP reference level
- Interference of implanted cardiac pacemakers with TASER X26 dart mode application
Articles in the same Issue
- Masthead
- Masthead
- Research Articles
- Biomechanical analysis of anterior stabilization techniques for different partial and total vertebral corpectomy defect models
- Biomechanical analysis of screw fixation vs. K-wire fixation of a slipped capital femoral epiphysis model
- Shoulder joint abduction motion test bench: A new shoulder test bench for in vitroexperiments with active muscle force simulation
- Primary stability of cementless threaded acetabular cups at first implantation and in the case of revision regarding micromotions as indicators
- Eye safety for scanning laser projection systems
- Experimental thresholds of magnetically induced currents via a figure-of-eight coil up to 25 kHz
- Simulation of the temperature elevation in children exposed to plane wave electromagnetic fields (10 MHz–1 GHz) at the ICNIRP reference level
- Interference of implanted cardiac pacemakers with TASER X26 dart mode application
