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Volume 3, Issue 4 (Suppl) J Clin Exp Orthop
ISSN:2471-8416 Osteoporosis and Arthroplasty 2017
December 04-05, 2017
Page 41
&
11th International Conference on
Joint Event
OSTEOPOROSIS, ARTHRITIS & MUSCULOSKELETAL DISORDERS
December 04-05, 2017 | Madrid, Spain
10th INTERNATIONAL CONFERENCE ON ARTHROPLASTY
A Falkenberg, J Clin Exp Orthop 2017, 3:4(Suppl)
DOI: 10.4172/2471-8416-C1-002
Does SiNcoating of tapers influence themechanics ofmodularhipprostheseswith respect tomicromotions
and pull-off strength?
Introduction & Aim: Metal debris released from taper junctions of modular hip arthroplasties caused by tribocorrosion
can promote implant failure. Micromotion between the mating taper surfaces is assumed to be a major factor contributing
to fretting corrosion. Ceramic heads exhibit less taper corrosion. To bypass metal-on-metal contact, a ceramic coating (SiN)
for the male taper surface was proposed. The aim was to clarify whether SiN coated tapers can mitigate micromotion and
positively influence the strength of the junction.
Material & Methods: 40 head-neck junctions from two suppliers (either CoCr heads, Aesculap, Germany or Ti6Al4V heads,
Peter Brehm, Germany) were combined with coated and uncoated neck adapters made of Ti6Al4V or CoCr (each combination
n=5). The components were assembled with 2000 N and consecutive dynamic sinusoidal loading representing loads of daily
activities was applied (Fmin=230 N; Fmax1=2300 N, Fmax2=4300 N and Fmax3=5300 N). Relative motion between head and
neck was measured. The pull-off force was measured quasi-statically.
Results: Ti6Al4V and CoCr necks exhibited relative motion of 12.5±1.2 µm and 6.4±0.4 µm, respectively (Figure 1) if exposed
to 2300 N loading. For 4300 N and 5300 N cyclic loading relative motion of 23.8±2.0 µm and 29.7±2.4 µm (Ti6Al4V) and
12.0±0.8 µm and 14.8±1.1 µm (CoCr) was measured, respectively. Tapers made of Ti6Al4V showed significantly increased
relative motion (p<0.001). Taper coating had no significant influence regarding relative motion (p=0.969). However, pull-off
strength was increased for coated tapers (p=0.018).
Discussion: Coating did not influence relative motion, though bears the potential to separate the metallic taper surfaces and
may inhibit fretting corrosion. The higher pull-off strength might potentially reduce the risk for head loosening.
Recent Publications:
1. Del Balso et al. (2015) Article title. Bone Joint J. 97-B: 911-16.
2. Gilbert et al. (1993) Article title. J Biomed Mater Res. 27: 1533-44.
3. Kocagoz et al. (2016) Article title. Clin Orthop Relat Res. 474: 985-994.
4. Bergmann et al. (2016) Article title. PLoS One. 11 (5): e0155612.
5. Haschke et al. (2016) Article title. Proc Inst Mech Eng H. 230 (7): 690-99.
Biography
A Falkenberg gained his expertise in mechanical engineering and biomechanics in educational institutions (Magdeburg University, Rostock University) and research
(TUHH, Hamburg). Currently, he is focused on mechanical testing of modular hip prostheses, specifically determining micromotions within taper junctions, which are as-
sumed to promote implant failure. The presented method helps to improve implant longevity and patient contentment by identifying risk factors in implant design.
A Falkenberg
TUHH - Hamburg University of Technology, Germany