Investigation of Bone Defects and Microcirculation With Computed Tomography and Magnetic Resonance Imaging
Subject of the proposed study is the non-invasive in vivo imaging of bone, bone marrow and localized microcirculation in test animals with osteoporosis, fractures and after placement of bone substitute material with volume computed tomography (VCT) (animals only) and functional magnetic resonance imaging (MRI). Furthermore patients with non-malignant osteoporosis or multiple myeloma will be examined before and after placement of a commercially available bone substitute material. Osseous structures before intervention and structural changes of the bone especially at the junction of substitute material and residual bone will be documented. At this, the proposed techniques allow imaging of the dynamic healing processes in the living organism.
Hypothesis: Affection of microcirculation at the junction of bone and bone substitute material can be displayed by VCT and functional MRI
|Study Design:||Observational Model: Cohort
Time Perspective: Prospective
|Official Title:||Examination of Bone Defects and Microcirculation Using Volume Computed Tomography and Dynamic Contrast-enhanced Magnetic Resonance Imaging|
- Changes of microcirculation at the interface between bone and implanted xenomaterial in patients with osteoporosis or multiple myeloma [ Time Frame: before (baseline)and after intervention, in follow-up 2 weeks, 1 month, 4 months after intervention ] [ Designated as safety issue: No ]This is a study within a multicenter multiproject frame. Development of bone-stabilizing implant material designed to stimulate the formation and regeneration of physiologically structured bone after vertebral collapse will be investigated. The subproject examins the interaction between host and graft. Hypothesis: Implanted materials will function as a framework for osteogenesis, and successful integration of the foreign material goes along with transient increase in microcirculation. Amplitude A and exchange rate constant kep of DCE-MRI will be measured to detect changes in microcirculation.
|Study Start Date:||July 2010|
|Estimated Study Completion Date:||July 2022|
|Estimated Primary Completion Date:||July 2014 (Final data collection date for primary outcome measure)|
patients with benign osteoporosis
In 30 patients with confirmed osteoporosis and vertebral fracture(s) dynamic contrast-enhanced MRI (DCE-MRI)and diffusion weighted imaging (DWI) of the vertebral column will be performed. Furthermore, 30 patients will be examined before and after insertion of foreign material as well as 2 weeks, 1 month and 4 months after surgery to investigate healing processes at the interface of bone and xenomaterial. New magnetic resonance imaging (MRI) sequences will be developed to improve the detection of osseous microstructure.
In an experimental study, mice, rats and sheep with and without an osteoporotic phenotype will be imaged with VCT, morphologic MRI, DCE-MRI and DWI. Using these methods, bone structure, vascularization and cellularity will be assessed in control and osteoporotic animals. Furthermore, these morphological and functional imaging techniques will be applied before and after implantation of biomaterials in bone in order to characterize morphological and functional changes in bone upon implantation of these biomaterials.
|Contact: Stefan Delorme, MDfirstname.lastname@example.org|
|German Cancer Research Center||Recruiting|
|Heidelberg, Germany, 69120|
|Study Chair:||Reinhard Schnettler, MD||Gießen University, Heidelberg|