Efficacy of Hounsfield Units Measured by Lumbar Computer Tomography on Bone Density Assessment

Objectives. The aim of this study was to review the bone density assessment techniques and evaluate the macroscopic structure of bone specimens scored by Hounsfield Units (HUs) and decide if they are always in congruence.Methods. The mandible of a formalin-fixed human cadaver was scanned by dental volumetric tomography (DVT) for planning of the specimen positions and fabrication of a surgical guide and a surgical stent was fabricated afterwards. Bone cylinders of 3.5 mm diameter and 5 mm length, were excised from the mandible using the surgical stent with a slow speed trephine drill. After removal of the cylinders two more scans were performed and the images of the first scan were used for the determination of the HU values. The removed bone cylinder was inspected macroscopically as well by micro-CT scan.Results. The highest HU values were recorded in the interforaminal region, especially in the midline (408–742). Posterior regions showed lower HU values, especially the first molar regions (22–61 for the right; 14–66 for the left first molar regions).Conclusion. Within the limitations of this pilot study, it can be concluded that HU values alone could be a misleading diagnostic tool for the determination of bone density.

Download Full-text

How Do Parameters of Implant Primary Stability Correspond with CT-Evaluated Bone Quality in the Posterior Maxilla? A Correlation Analysis

Materials ◽

10.3390/ma14020270 ◽

2021 ◽

Vol 14 (2) ◽

pp. 270

Author(s):

Ji-Hyun Kim ◽

Young-Jun Lim ◽

Bongju Kim ◽

Jungwon Lee

Keyword(s):

Bone Density ◽

Bone Quality ◽

Objective Assessment ◽

Primary Stability ◽

Insertion Torque ◽

Hounsfield Units ◽

Stability Parameters ◽

Posterior Maxilla ◽

Different Types ◽

Edentulous Patients

The aim of the present study was to evaluate correlations between bone density and implant primary stability, considering various determinants such as age, gender, and geometry of implants (design, diameter). Bone density of edentulous posterior maxillae was assessed by computed tomography (CT)-derived Hounsfield units, and implant primary stability values were measured with insertion torque and resonance frequency analysis (RFA). A total of 60 implants in 30 partially edentulous patients were evaluated in the posterior maxilla with two different types of dental implants. The bone density evaluated by CT-derived Hounsfield units showed a significant correlation with primary stability parameters. The bone quality was more influenced by gender rather than age, and the type of implant was insignificant when determining primary stability. Such results imply that primary stability parameters can be used for objective assessment of bone quality, allowing surgical modifications especially in sites suspected of poor bone quality.

Download Full-text

All Patients with Inflammatory Bowel Disease Should Have Bone Density Assessment: Pro

Inflammatory Bowel Diseases ◽

10.1097/00054725-200105000-00012 ◽

2001 ◽

Vol 7 (2) ◽

pp. 158-162 ◽

Cited By ~ 17

Author(s):

Alexandra Papaioannou ◽

Nicole C. Ferko ◽

J. D. Adachi

Keyword(s):

Inflammatory Bowel Disease ◽

Bone Density ◽

Bowel Disease ◽

Inflammatory Bowel ◽

Density Assessment

Download Full-text

PERIPROSTHETIC BONE DENSITY CHANGES EVALUATION USING COMPUTED TOMOGRAPHY

Hirurgiâ pozvonočnika ◽

10.14531/ss2005.4.72-76 ◽

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.

Download Full-text

Investigation of the bone density in multiple sclerosis

Bulletin of Siberian Medicine ◽

10.20538/1682-0363-2008-2-46-51 ◽

2008 ◽

Vol 7 (2) ◽

pp. 46-51

Author(s):

O. S. Dranichnikova ◽

V. D. Zavadovskaya ◽

V. M. Alifirova

Keyword(s):

Physical Activity ◽

Multiple Sclerosis ◽

Bone Density ◽

Bone Formation ◽

Bone Mass ◽

Computer Tomography ◽

Dramatic Decrease ◽

Disability Status ◽

Common Opinion ◽

Therapy Sessions

A number of investigations revealed a problem of osteopenic syndrome in patients with multiple sclerosis but there is no common opinion concerning factors which lead to its development. We observed 65 patients with multiple sclerosis with various type of its course and disability status of several degree based upon EDSS scale. Ultrasound osteometry of the calcaneus, computer tomography of QCT of L1—L3 vertebras were performed, serum crosslaps, N-MID osteocalcin were used. Decreased bone density, injured bone microarchitectonics and suppression of bone formation and resorption, which were correlated EDSS were found. Correlations with other factors (growth, weight, gender, and number of steroid therapy sessions ) for these parameters was not revealed. This allowed to conclude that the main reason of decreased bone mass in patients with multiple sclerosis is the dramatic decrease in physical activity.

Download Full-text