Determination of periprosthetic bone density with the DEXA method after implantation of custom-made uncemented femoral stems

1996 ◽  
Vol 20 (4) ◽  
pp. 218-221 ◽  
Author(s):  
F. Martini ◽  
S. Sell ◽  
E. Kremling ◽  
W. Küsswetter
Keyword(s):  
Bone Density ◽  
Periprosthetic Bone ◽  
Custom Made ◽  
Femoral Stems

Immediate Changes of Bone Density Caused by the Implantation of a Femoral Stem - A Dexa Study

2011 ◽  
Vol 21 (6) ◽  
pp. 706-712 ◽  
Author(s):  
Ulf G. Leichtle ◽  
Jeremi Leasure ◽  
Franz Martini ◽  
Carmen I. Leichtle
Keyword(s):  
Bone Density ◽  
Bone Loss ◽  
Femoral Stem ◽  
Periprosthetic Bone ◽  
Experimental Conditions ◽  
Press Fit ◽  
Custom Made ◽  
Femoral Stems ◽  
Cementless Prosthesis ◽  
Post Implantation

Considerable immediate periprosthetic bone density changes after implantation of femoral stems have been observed comparing DEXA measurements taken pre- and post-operatively. This is important in relation to the interpretation of DEXA studies. We analysed these density changes under standardised experimental conditions. Five human femora were implanted with a custom made femoral stem and ten femora with a standard cementless prosthesis. Densitometry was performed at various stages of implantation. Following rasping only slight density changes were noted (–2.7% to +0.7%). Comparing post-implantation and pre-operative measurements, all custom made stems with a proximal press-fit demonstrated clear increases in proximal periprosthetic bone density of +11% and +14%. In contrast, the standard prosthesis with a distal press-fit showed a loss of –5% and –2% in the proximal zones. Measurements following removal of the implants demonstrated hardly any density changes (0% to –4%) compared to the pre-operative measurements. We concluded that compacting of trabecular bone or bone loss due to rasping are not the main causes of density changes. Substantial measuring errors exist. For examination of periprosthetic bone density changes, pre-operative initial measurements should not be used as a baseline for comparison. Studies should commence with an immediate postoperative measurement.

scholarly journals Long-term results of the custom- made hip endoprostheses Evolution K® and Adaptiva®: A prospective cohort study

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Steffen Axt ◽  
Andreas Kirschniak ◽  
Lena Axt ◽  
Manuel Braun ◽  
Christian Beltzer ◽  
...  
Keyword(s):  
Survival Rate ◽  
Bone Density ◽  
Stress Shielding ◽  
Clinical Results ◽  
Long Term Results ◽  
Harris Hip Score ◽  
Periprosthetic Bone ◽  
Hip Prostheses ◽  
Custom Made

The aim of our study is to evaluate clinical long-term results and determine changes in periprosthetic bone density of the custom-made hip prostheses Evolution-K® and Adaptiva®. Periprosthetic bone density were evaluated by means of DEXA (LunariDXA- Prodigy® bone densitometer) with a long-term follow-up of 16 (15-18) years (Evolution-K®) in 24 patients and 13 (13-15) years (Adaptiva®) in 41 patients. Evolution- K® had a survival rate of 92% and yielded 79/100 points in Harris Hip Score, a mediocre result. Adaptiva® had a survival rate of 99% and achieved a good score of 88/100 points. Bone density measurements demonstrated the greatest loss of bone density in the proximal regions of interest (ROI) for both prosthesis types (Evolution-K®: -25.8% ROI 1, -40.3% ROI 7; -8.3% ROI 2, -10.4% ROI 6; Adaptiva®: -29.8% ROI 7, -6.8% ROI 6, +14.3% ROI 3, +3.1% ROI 4). Adaptiva® yielded a good clinical result as compared to Evolution-K® with only average clinical results. Both prostheses clearly showed signs of “stress shielding”. Here, the Adaptiva® achieved reduced bone density loss as compared to the Evolution-K®.

The determination of bone density by radiation absorption

1974 ◽  
Vol 15 (1) ◽  
pp. 189-199 ◽  
Author(s):  
N. J. Siemon ◽  
E. W. Moodie ◽  
D. F. Robertson
Keyword(s):  
Bone Density ◽  
Radiation Absorption

Primary stability in cementless femoral stems: custom-made versus conventional femoral prosthesis

2002 ◽  
Vol 17 (4) ◽  
pp. 267-273 ◽  
Author(s):  
Christian Götze ◽  
Wolfram Steens ◽  
Volker Vieth ◽  
Christopher Poremba ◽  
Lutz Claes ◽  
...  
Keyword(s):  
Primary Stability ◽  
Femoral Prosthesis ◽  
Custom Made ◽  
Femoral Stems

scholarly journals PERIPROSTHETIC BONE DENSITY CHANGES EVALUATION USING COMPUTED TOMOGRAPHY

2005 ◽  
pp. 072-076
Author(s):  
Fidele Likibi ◽  
Michel Assad ◽  
Christine Coillard ◽  
Gilles Chabot ◽  
Charles-H. . Rivard
Keyword(s):  
Computed Tomography ◽  
Bone Density ◽  
Computer Tomography ◽  
Lumbar Fusion ◽  
Titanium Implant ◽  
Density Variation ◽  
Periprosthetic Bone ◽  
Sheep Model ◽  
Post Implantation

The aim of this study was to examine the effect of the presence of two types of metallic intervertebral lumbar fusion implants (a porous nitinol and a hollow titanium cylindrical implants) in the implant peripheral tissue after 3, 6 and 12 months post-implantation in a lumbar sheep model in order to evaluate and compare the biofunctionality and biocompatibility of both implants. 19 sheep were used to evaluate this bone density variation using computer tomography (CT). 16 of them received both implants at either level L2–L3 or L4–L5 and 3 other non-treated animals were used as controls. Results indicated that PNT obtained a superior biofunctionality that the conventional titanium implant. However, the biocompatibility of porous nitinol seemed comparable to that of titanium – a well-known long-term implant material.

scholarly journals Innovative Design Methodology for Patient-Specific Short Femoral Stems

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 442
Author(s):  
William Solórzano-Requejo ◽  
Carlos Ojeda ◽  
Andrés Díaz Lantada
Keyword(s):  
Computer Aided Design ◽  
Design Methodology ◽  
Patient Specific ◽  
Bone Stock ◽  
Innovative Design ◽  
Hip Prostheses ◽  
Custom Made ◽  
In Silico Studies ◽  
Femoral Stems ◽  
Short Stems

The biomechanical performance of hip prostheses is often suboptimal, which leads to problems such as strain shielding, bone resorption and implant loosening, affecting the long-term viability of these implants for articular repair. Different studies have highlighted the interest of short stems for preserving bone stock and minimizing shielding, hence providing an alternative to conventional hip prostheses with long stems. Such short stems are especially valuable for younger patients, as they may require additional surgical interventions and replacements in the future, for which the preservation of bone stock is fundamental. Arguably, enhanced results may be achieved by combining the benefits of short stems with the possibilities of personalization, which are now empowered by a wise combination of medical images, computer-aided design and engineering resources and automated manufacturing tools. In this study, an innovative design methodology for custom-made short femoral stems is presented. The design process is enhanced through a novel app employing elliptical adjustment for the quasi-automated CAD modeling of personalized short femoral stems. The proposed methodology is validated by completely developing two personalized short femoral stems, which are evaluated by combining in silico studies (finite element method (FEM) simulations), for quantifying their biomechanical performance, and rapid prototyping, for evaluating implantability.

scholarly journals Determination of the Hounsfield value for CT-based design of custom femoral stems

1999 ◽  
Vol 81-B (1) ◽  
pp. 143-147 ◽  
Author(s):  
A. Aamodt ◽  
K. A. Kvistad ◽  
E. Andersen ◽  
J. Lund-Larsen ◽  
J. Eine ◽  
...  
Keyword(s):  
Femoral Stems

A method for determination of relative bone density in implantology

2019 ◽  
Author(s):  
D. Hyka-Xhako ◽  
N. Hyka ◽  
J. Jani
Keyword(s):  
Bone Density
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