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The aim of this study was to evaluate the influence of microstructural parameters, such as porosity and osteon dimensions, on strength. Therefore, the predictive value of bone mineral density (BMD) measured by quantitative computed tomography (QCT) for intracortical porosity and other microstructural parameters, as well as for strength of cortical bone(More)
Peripheral quantitative computed tomography (pQCT) is an established diagnostic method for assessment of bone mineral density in the diagnosis of osteoporosis. However, the capacity of structural parameters of cancellous bone measured by high-resolution computed tomography remains to be explored. In 33 patients, bone mineral density (BMD) of the proximal(More)
OBJECTIVE The purpose of this study was to assess the validity of two methodically different radiological parameters, bone mineral density and Singh Index, for the prediction of mechanical properties in femoral cancellous bone. DESIGN Coherence between in vitro evaluation of mechanical properties and bone mineral density on a femoral bone slice, combined(More)
Calcium phosphates are frequently used as bone substitute materials because of their similarity to the mineral phase of bone, absence of antigenicity, and excellent osteoconductivity. However, in most currently available mineral substitutes, resorption occurs slowly if at all. In contrast, calcium phosphate cements have shown rapid resorption and remodeling(More)
The high importance of intracortical porosity for mechanical strength of cortical bone has been established. The contribution of other parameters of microstructure such as osteon dimensions for strength is in discussion. The aim of this study was to evaluate the predictive value of microcomputed tomography (µCT) for porosity and other microstructural(More)
Primary total hip arthroplasty (THA) has been suggested for old patients with acetabular fractures, because it permits immediate full weight bearing and precludes secondary surgery for posttraumatic osteoarthritis. The authors retrospectively analyze the outcome after 35 primary THAs performed between 1982 and 2001 focusing on complications, functional(More)
Die wesentliche Problematik der distalen Radiusfraktur liegt in der Qualität ihrer Reposition und Retention. 35 Patienten mit distalen Radiusfrakturen und Abrissfrakturen des Processus styloideus ulnae wurden hinsichtlich ihrer funktionellen und radiologischen Ergebnisses sowie ihrer subjektiven Beschwerden nachuntersucht. Dabei zeigten sich signifikant(More)
Stainless steel and commercially pure titanium are widely used materials in orthopedic implants. However, it is still being controversially discussed whether there are significant differences in tissue reaction and metallic release, which should result in a recommendation for preferred use in clinical practice. A comparative study was performed using 14(More)
Background: Major osseous defects in trauma or tumor patients require surgical reconstruction. While transplantation of autogenous or allogenous bone is still regarded as the standard, a multitude of alternative substitute materials has been developed in the recent years. Currently, the majority of commercially available products is based on calcium(More)
Joint angles are measured using goniometers according to the neutral-zero method. These measurements are dependent on the examiner and are thus subject to great variation. With a newly developed sensor glove, the grip patterns of the hand can be captured with a computer-assisted technique. In a comparative study involving five subjects, the joint angles(More)