Adequate primary stability of the acetabular revision construct is necessary for long-term implant survival. The difference in primary stability between tantalum and titanium components is unclear. Six composite hemipelvises with an acetabular defect were implanted with a tantalum augment and cup, using cement fixation between cup and augment. Relative motion was measured at cup/bone, cup/augment and bone/augment interfaces at three load levels; the results were compared to the relative motion measured at the same interfaces of a titanium cup/augment construct of identical dimensions, also implanted into composite bone. The implants showed little relative motion at all load levels between the augment and cup. At the bone/augment and bone/cup interfaces the titanium implants showed less relative motion than tantalum at 30% load (p < 0.001), but more relative motion at 50% (p = n.s.) and 100% (p < 0001) load. The load did not have a significant effect at the augment/cup interface (p = 0.086); it did have a significant effect on relative motion of both implant materials at bone/cup and bone/augment interfaces (p < 0.001). All interfaces of both constructs displayed relative motion that should permit osseointegration. Tantalum, however, may provide a greater degree of primary stability at higher loads than titanium. The clinical implication is yet to be seen.
Comparison of the Primary Stability of Porous Tantalum and Titanium Acetabular Revision Constructs.
2020-04-10
Beckmann, Nicholas A.; Bitsch, Rudi G; Schonhoff, Mareike; Siebenrock, Klaus-Arno; Schwarze, Martin; Jaeger, Sebastian (2020). Comparison of the Primary Stability of Porous Tantalum and Titanium Acetabular Revision Constructs. Materials, 13(7) Molecular Diversity Preservation International MDPI 10.3390/ma13071783
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
DDC: | 629 |
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