Is There a Benefit to Modularity for Femoral Revisions When Using a Splined, Tapered Titanium Stem?

2020 ◽  
Vol 35 (6) ◽  
pp. S278-S283
Author(s):  
Matthew R. Cohn ◽  
Matthew W. Tetreault ◽  
Jefferson Li ◽  
Kyle N. Kunze ◽  
Cindy R. Nahhas ◽  
...  
Keyword(s):  
Author(s):  
Manish Kiran ◽  
Konstantinos G. Makridis ◽  
Catherine Armstrong ◽  
Birender Kapoor ◽  
Gunasekaran Kumar ◽  
...  

2020 ◽  
Vol 35 (8) ◽  
pp. 2167-2172
Author(s):  
Yusuke Takaoka ◽  
Koji Goto ◽  
Yutaka Kuroda ◽  
Toshiyuki Kawai ◽  
Shuichi Matsuda

1997 ◽  
Vol 12 (2) ◽  
pp. 223
Author(s):  
J.Bohannon Mason ◽  
Steve R. Wardell ◽  
Van P. Stamos ◽  
Geoffrey VanFlandern ◽  
Benjamin E. Bierbaum ◽  
...  

2006 ◽  
Vol 11 (2) ◽  
pp. 175-179 ◽  
Author(s):  
Henrik Bodén ◽  
Mats Salemyr ◽  
Olof Sköldenberg ◽  
Torbjörn Ahl ◽  
Per Adolphson

2014 ◽  
Vol 85 (6) ◽  
pp. 562-569 ◽  
Author(s):  
Dieter C Wirtz ◽  
Sascha Gravius ◽  
Rudolf Ascherl ◽  
Miguel Thorweihe ◽  
Raimund Forst ◽  
...  

2002 ◽  
Vol 84 (3) ◽  
pp. 425-431 ◽  
Author(s):  
ALEXANDER GRÜBL ◽  
CATHARINA CHIARI ◽  
MARTIN GRUBER ◽  
ALEXANDRA KAIDER ◽  
FLORIAN GOTTSAUNER-WOLF

2007 ◽  
Vol 17 (4) ◽  
pp. 194-204 ◽  
Author(s):  
S. O'brien ◽  
R.K. Wilson ◽  
B.M. Hanratty ◽  
N.W. Thompson ◽  
M.E. Wallace ◽  
...  

We report a series of 706 patients (759 hip implants) with an average follow up of 10.5 years (range, 10 - 11 years) following total hip replacement (THR) using a cemented custom-made femoral stem and a cemented HDP acetabular component. The fate of every implant is known. One hundred and seventy-four patients (23%) were deceased at the time of their 10-year review - all died with a functioning THR in situ. Four hundred and sixty-two patients (61%) were subsequently reviewed. One hundred and twenty three patients (16%) were assessed by telephone review, as they were too ill or unwilling to attend. Kaplan-Meier survival analysis (all components) demonstrated a median survival at 10 years of 96.05% or 95% Confidence Intervals (CI) for median survival of (94.41% to 97.22%). Revision surgery occurred in 30 cases (3.9%). Seventeen had full revisions (2.2%) and 13 (1.7%) socket revisions only. Twenty-one out of 30 revisions were for infection or dislocation. There were 2 cases (0.3%) of revision for aseptic loosening of the stem. The 10-year results of the custom femoral titanium stem are encouraging and compare well with other cemented systems.


2020 ◽  
Vol 102-B (7_Supple_B) ◽  
pp. 33-40
Author(s):  
Jonathan A. Gustafson ◽  
Robin Pourzal ◽  
Brett R. Levine ◽  
Joshua J. Jacobs ◽  
Hannah J. Lundberg

Aims The aim of this study was to develop a novel computational model for estimating head/stem taper mechanics during different simulated assembly conditions. Methods Finite element models of generic cobalt-chromium (CoCr) heads on a titanium stem taper were developed and driven using dynamic assembly loads collected from clinicians. To verify contact mechanics at the taper interface, comparisons of deformed microgroove characteristics (height and width of microgrooves) were made between model estimates with those measured from five retrieved implants. Additionally, these models were used to assess the role of assembly technique—one-hit versus three-hits—on the taper interlock mechanical behaviour. Results The model compared well to deformed microgrooves from the retrieved implants, predicting changes in microgroove height (mean 1.1 μm (0.2 to 1.3)) and width (mean 7.5 μm (1.0 to 18.5)) within the range of measured changes in height (mean 1.4 μm (0.4 to 2.3); p = 0.109) and width (mean 12.0 μm (1.5 to 25.4); p = 0.470). Consistent with benchtop studies, our model found that increasing assembly load magnitude led to increased taper engagement, contact pressure, and permanent deformation of the stem taper microgrooves. Interestingly, our model found assemblies using three hits at low loads (4 kN) led to decreased taper engagement, contact pressures and microgroove deformations throughout the stem taper compared with tapers assembled with one hit at the same magnitude. Conclusion These findings suggest additional assembly hits at low loads lead to inferior taper interlock strength compared with one firm hit, which may be influenced by loading rate or material strain hardening. These unique models can estimate microgroove deformations representative of real contact mechanics seen on retrievals, which will enable us to better understand how both surgeon assembly techniques and implant design affect taper interlock strength. Cite this article: Bone Joint J 2020;102-B(7 Supple B):33–40.


2016 ◽  
Vol 31 (10) ◽  
pp. 2231-2236 ◽  
Author(s):  
Samuel W. Carlson ◽  
Devon D. Goetz ◽  
Steve S. Liu ◽  
Justin J. Greiner ◽  
John J. Callaghan

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