[Macerated human hip bone preparation as a substitute for fresh frozen preparations for testing the primary stability and frictional torques of cementless hip cups].
OBJECTIVE
The aim of the study was to validate macerated human acetabuli as replacement for fresh frozen preparations for testing primary stability and the screwing in moments of cementless threaded hip cups.


METHODS
Three fresh frozen human pelvis were tested. One half of each pelvis was macerated whereas the other half was preserved as fresh frozen preparation. In the side of every pelvis the moments of screwing-in, the micromotions, the maximum expressing force and the maximum pull-out torque were determined.


RESULTS
The screwing in moments, the maximum expressing forces and the maximum pull-out torques did not change. The micromotions were reduced to half.


CONCLUSIONS
Considering the reduction of the micromotions, macerated human acetabuli are valid replacements for fresh frozen preparations for testing the primary stability and the screwing-in behaviour of screwed pans.
von Schulze Pellengahr
C
C
Orthopädische Klinik und Poliklinik, Ludwig-Maximilians-Universität München. Christoph.Pellengahr@med.uni-muenchen.de
Bürkner
A
A
Plitz
W
W
Mazoochian
F
F
Dürr
H R
HR
Müller
P E
PE
Zysk
S
S
Baur-Melnyk
A
A
Refior
H J
HJ
Jansson
V
V
D002484:Cementation; D015925:Cryopreservation; D019544:Equipment Failure Analysis / Q000295:instrumentation / Q000379:methods*; D017276:Friction; D006622:Hip Prosthesis; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology* / Q000601:surgery*; D009068:Movement; D010384:Pelvic Bones / Q000503:physiopathology* / Q000601:surgery*; D013314:Stress, Mechanical; D046509:Tissue Culture Techniques / Q000379:methods*