| Title |
Primary stability of a shoulderless Zweymüller hip stem: a comparative in vitro micromotion study
|
|---|---|
| Published in |
Journal of Orthopaedic Surgery and Research, July 2016
|
| DOI | 10.1186/s13018-016-0410-1 |
| Pubmed ID | |
| Authors |
Ralf Bieger, Tobias Freitag, Anita Ignatius, Heiko Reichel, Lutz Dürselen |
| Abstract |
The Zweymüller stem design has proven long-term stability with a 20-year survival rate of over 90 %. Primary stability necessitates implant-bone micromotions below 150 μm, otherwise bony ingrowth is negatively influenced. Using fresh paired human femurs, we investigated a modification of the Zweymüller-type stem design with reduced proximal lateral shoulder in reference to primary stability. Relative motion between the implant and the cortical bone as well as the irreversible implant migration was investigated under dynamic loading (100-1600 N) over 100,000 cycles using miniature displacement transducers. Micromotions were below the critical threshold for both implants at all measurement points. Axial reversible and irreversible micromotions were not influenced by reducing the shoulder of the prosthesis. Resistance against rotational moments was less pronounced after reduction of the shoulder without statistical significant results. Reducing the proximal shoulder of the Zweymüller-type stem design does not negatively influence axial stability but might negatively influence rotational stability. Even though, comparable results still suggest a reasonable resistance against rotational forces. |
X Demographics
The data shown below were collected from the profiles of 2 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 2 | 100% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 2 | 100% |
Mendeley readers
The data shown below were compiled from readership statistics for 26 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 26 | 100% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Master | 5 | 19% |
| Student > Postgraduate | 4 | 15% |
| Other | 3 | 12% |
| Student > Doctoral Student | 3 | 12% |
| Researcher | 2 | 8% |
| Other | 5 | 19% |
| Unknown | 4 | 15% |
| Readers by discipline | Count | As % |
|---|---|---|
| Medicine and Dentistry | 9 | 35% |
| Engineering | 5 | 19% |
| Biochemistry, Genetics and Molecular Biology | 2 | 8% |
| Nursing and Health Professions | 2 | 8% |
| Arts and Humanities | 1 | 4% |
| Other | 1 | 4% |
| Unknown | 6 | 23% |
Attention Score in Context
This research output has an Altmetric Attention Score of 2. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 09 August 2016.
All research outputs
#14,268,160
of 22,880,230 outputs
Outputs from Journal of Orthopaedic Surgery and Research
#495
of 1,378 outputs
Outputs of similar age
#204,690
of 355,070 outputs
Outputs of similar age from Journal of Orthopaedic Surgery and Research
#11
of 30 outputs
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So far Altmetric has tracked 1,378 research outputs from this source. They receive a mean Attention Score of 3.6. This one has gotten more attention than average, scoring higher than 58% of its peers.
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