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For stable implantation of anatomically conforming femur prostheses, modifications that accommodate curving and torsion are necessary. In accordance to this concept, the anatomically shaped SBG stem has been developed. The first consecutive implantations were evaluated. 194 primary arthroplasties with uncemented anatomical, HA coated SBG stems were(More)
Optimal fixation of cementless stems is a precondition for long-lasting stability. Thus, anchorage, stabilizers, material and surface are of essential importance. To achieve primary stability, good rotational, tilting and axial stability is necessary. Stabilizers such as fins and ribs optimize stability. The CCD-angle and length of neck-axis determine the(More)
The N terminus of chicken collagen XIV is subject to alternative splicing. The longer isoform contains a fibronectin type III (F3) domain at its N terminus, whereas the shorter isoform is lacking this domain. Alternative splicing of the F3 domain is developmentally regulated. At early embryonic stages, both isoforms are expressed, whereas after hatching(More)
INTRODUCTION AND AIM OF STUDY The screw-in behaviour and correct positioning of threaded cups is largely determined by the design of the thread. Up to now the various thread designs have not been systematically classified. METHODS The thread designs of 10 first generation and 27 second generation threaded cups were analyzed using a tool setter and a(More)
PURPOSE OF THE STUDY Over a period of three generations, threaded cups were developed and have become viable contemporary cementless hip implants. A few implants already have a high success rate over the mid and long term. Aim of this study was to evaluate contemporary threaded cups. MATERIAL AND METHODS 30 of the second and third generation cups were(More)
Utilizing the FISH technique, the gene for collagen XIV was mapped in the human and the mouse genome. The human gene (COL14A1) was assigned to chromosome bands 8q23-->q24.1. This assignment is in agreement with the localization of the undulin gene (UND), whose product has been suggested to be a variant of collagen XIV. The mouse gene (Col14a1) was assigned(More)
The anatomy of the hip must be taken into account in order to ensure primary stability of cementless acetabular implants. In this study we analyzed the shapes of osteoarthritic acetabula and compared these to normal non-degenerative acetabula and to pressfit implants. We measured 92 acetabula with osteoarthritic deformations and 35 non-degenerative(More)
Important criteria for stable cup fixation are the type of anchor system and stabilizers,cup form and the material and surface structure. Different fixation systems are manifest in pressfit and threaded cups. Pressfit implants are oversized and lead to equatorial jamming. For additional fixation, and to improve stability, screws, pegs, rings, fins, spikes(More)
To enable a comparison of different pressfit acetabular cups objective criteria are essential. The aim of this study is to describe the design features of this type of cup and to analyse currently available cups. 30 implants were systematically measured and analysed. The mean surface roughness (Ra) was determined and configurations established with the(More)
Our goal is to simulate the dynamics of aesthetic preferences – the well-observable fact that liking judgements are subject to periodic changes. Carbon (2010) showed such a cyclic pattern for car design, with a striking predomination of curved car bodies up to the 70ies (like in the famous Volkswagen Beetle); that were replaced by angled styles in the 80ies(More)