INTRODUCTION: Hip arthroscopy is an effective treatment for femoroacetabular impingement (FAI). Purpose of the present study was to report patient reported outcomes, hip survival retrospectively at a mean follow-up five years. METHODS: Retrospectively collected data on 25 patients with FAI minimum 42 months (mean 60 months) treated and labrum repair were analyzed. The primary outcome measures O...

We give model-theoretic accounts and proofs of the following results: Suppose ∂y = Ay is a linear differential equation over a differential field K of characteristic 0, and the field CK of constants of K is existentially closed in K. Then: (i) There exists a Picard-Vessiot extension L of K, namely a differential field extension L of K which is generated by a fundamental system of solutions of t...

We point out that the theory of difference fields with algebraically closed fixed field has no model companion. By a difference field we mean a field K equipped with an automorphism σ. It is well-known ([?]) that the class of existentially closed difference fields is an elementary class (ACFA), and moreover all completions are unstable. The fixed field (set of a ∈ K such that σ(a) = a) is respo...

pre-implant disease is an inflammatory process that affects the surrounding tissues of a functional osseointegrated implant. it is usually the result of a disequilibrium between the micro-flora and the defense system. this case reports a 57-year-old man with unusual bone loss around dental implants. this was an unusual case of peri-implantitis that occurred only in the implants on one side of t...

cauda equina syndrome (ces) although uncommon, is a very serious condition, which should be diagnosed as soon as possible.  urinary dysfunction following a lumbosacral trauma is a key for the physician to consider ces as the most probable diagnosis. up to 62% of ces patients report a recent episode of trauma. we herein report a young man with ces due to sacral fracture with an interesting imaging.

To construct a suitable and secure proxy re-signature scheme is not an easy job, up to now, there exist only three schemes, one is proposed by Blaze et al. [6] at EUROCRYPT 1998, and the others are proposed by Ateniese and Hohenberger [2] at ACM CCS 2005. However, none of these schemes is proved in the standard model (i.e., do not rely on the random oracle heuristic). In this paper, based on Wa...