Stefan P Zysk

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BACKGROUND AND PURPOSE Differentiating acute benign from neoplastic vertebral compression fractures can pose a problem in differential diagnosis on routine MR sequences, as signal changes can be quite similar. Our purpose was to assess the value of increasing the diffusion weighting of a diffusion-weighted steady-state free precession (SSFP) sequence for(More)
In all, 133 patients with an acute rupture of the anterior cruciate ligament (ACL) were reviewed (aged ¶40 to 59 years). Average follow-up was 29 ± 10 months. Thirty-one patients underwent conservative therapy, 35 patients were treated by primary suture, while in 67 the primary suture was augmented with the semitendinosus tendon. The patients with primary(More)
There is growing evidence that cytokines such as tumor necrosis factor (TNF) α, interleukin (IL) 1β, IL-6, bone morphogenetic proteins (BMP), and nitric oxide (NO) play an important role in the pathogenesis of bone tunnel enlargement following anterior cruciate ligament (ACL) reconstruction. Furthermore, the release of these mediators has been considered a(More)
The aim of this study was to investigate whether all sizes of wear particles are capable of provoking inflammatory responses and whether there are different responses among different particle sizes. The knees of 40 female Balb/c mice were injected with polystyrene particles of three different diameters, 0.5 microm, 2.0 microm, and 75 microm, using a 0.1%(More)
AIM Local toxic reactions are one possible reason for fibrous tissue formation at the interface between bone and PMMA bone cement. Most of the numerous in vitro studies have shown severe cytotoxicity of bone cements and their components. However, in vivo investigations of the local tissue toxicity of bone cements have so far seldom been performed. METHODS(More)
According to several reports in the last few years, desoxypyridinoline (Dpd) in urine increases significantly in cases of loosened arthroplasty. Therefore, this marker was suggested as useful in the diagnostics of implant loosening. In this study, the level of Dpd was determined in 69 patients with arthroplasty of the hip or the knee joint. Thirty-four of(More)
AIM The etiology of rotator cuff tears is multifactorial. An important factor is the damage of the rotator cuff by narrowing of the subacromial space. The purpose of this investigation was to estimate the influence of various metrical parameters on the size of the subacromial space. METHOD We investigated 161 human macerated scapulae, 36 of them had a(More)
OBJECTIVES Growing evidence supports the substantial pathophysiological impact of platelets on the development of rheumatoid arthritis. At present there are no methods for studying these cellular mechanisms in vivo. The aim of this study was to visualize and investigate platelet-endothelial cell interaction in the knee joint of mice with antigen-induced(More)
The aim of this study was to examine soft tissue tumor recurrences and posttherapeutic soft tissue changes in humans with a diffusion-weighted steady-state free precession (SSFP) sequence. Twenty-four patients with 29 pathologies of the pelvis or the extremities were examined. The lesions were classified as follows: group 1, recurrent viable tumors (n =(More)
The position of the acetabular cup is of decisive importance for the function of a total hip replacement (THR). Using the conventional surgical technique, correct placement of the cup often fails due to a lack of information about pelvic tilt. With CT-based and fluoroscopically-assisted navigation procedures the accuracy of implantation has been(More)