[Comparative static biomechanical studies of tripod surface structures of cementless endoprostheses].
OBJECTIVE
While the importance of stability of endoprosthetic surface structures has been recognized for some time there is a lack of comparative surveys and assessment indices that would permit comparison and improvement of surfaces on cementless endoprostheses.


METHODS
Using separately produced, systematically mounted specimen pieces of endoprosthetic surfaces with isolated non-linked elements of varying shapes and sizes, stability parameters and stability behaviour are described. Results of tripode-structures are compared to spherical surfaces.


RESULTS
These investigations show clearly that geometrical attributes, the orientation and the contact of surface elements to the endoprosthetic stem influence the stability considerably more than the size of these surface elements.


CONCLUSIONS
Using tripode-elements with different orientation, size and density, a differentiated formation of cementless endoprosthetic surfaces is possible.
Mittelmeier
W
W
Klinik für Orthopädie und Sportorthopädie, Technischen Universität München.
Grunwald
I
I
Schäfer
R
R
Steinhauser
E
E
Gradinger
R
R
D001696:Biomechanical Phenomena; D020099:Coated Materials, Biocompatible; D019544:Equipment Failure Analysis / Q000295:instrumentation*; D006622:Hip Prosthesis; D006801:Humans; D016348:Osseointegration / Q000502:physiology; D011474:Prosthesis Design; D013499:Surface Properties
D020099:Coated Materials, Biocompatible
Vergleichende statische biomechanische Untersuchungen zu Tripoden-Oberflächenstrukturen zementfreier Endoprothesen.