Bone Abstracts

Objectives: The skeleton is not a single functional unit but consists of different, well-organized and mineralized compartments with specific functions, developmental aspects and regulations. Differences in the regulation of spinal and long bone elongation are mirrored clinically by the age course in body proportions. Whereas growth plates (GPs) in long bones can easily be discriminated, vertebral GPs are part of the cartilaginous endplate, which typically shows important spec...

Objectives: Dysregulation of systemic phosphate homeostasis is often associated with impairment of musculoskeletal tissue function. Many factors such as calcium levels and dysegulated endocrine mechanisms are thought to contribute. Inorganic phosphate and FGF23 have been shown to act via similar signaling pathways in several cell types but we are not aware of any detailed investigations into their effect on the differentiation and viability of skeletal muscle cells. W...

Background: Disturbance of systemic phosphate homeostasis is often associated with musculoskeletal dysfunction. Multiple factors related to the underlying condition such as calcium levels and endocrine mechanisms are thought to contribute. Distinct effects of inorganic phosphate itself as well as its main regulator FGF23 by activation of similar pathways have been shown in several cell types. We are not aware of any detailed investigations into their effect on the differentiat...

Objective: Linear growth is achieved by enchondral ossification in epiphyseal growth plates (GP) of long bones. These highly organized cartilaginous tissues contain chondrocytes of all differentiational stages classified in 3–5 specific zones. Due to their discrete characteristics, distinct analysis of each zone is essential in basic GP research. While the efficiency of zonal separation is therefore highly influencing on study results, comparative data on commonly used me...

Background: Systemic alterations in Runx2 expression have been shown to affect flat and long bone formation differently: Inactivating mutations cause low-turnover bone disease and patent fontanels in cleidocranial dysplasia, while overexpressing mutations cause metaphyseal dysplasia with maxillary hypoplasia and brachydactyly. The two conditions have inverse skeletal phenotypes. We know of no descriptions of these disorders in a patient without duplications or mutations of Run...

Objectives: X-linked hypophosphatemia (XLH) is a rare genetic disorder of phosphate metabolism caused by mutations in the PHEX gene. This pilot study aims to apply novel imaging techniques to asses the musculoskeletal phenotype of XLH patients by bidirectional axial transmission (BDAT) ultrasound, magnetic resonance spectroscopy (MRS) and high resolution peripheral quantitative computed tomography (HR-pQCT).Methods: BDAT bone ultrasound of the radius and...