Thepathologyof spongeorangeband diseasea¡ecting the Caribbean barrel spongeXestospongiamuta Hilde Angermeier, Janine Kamke, Usama R. Abdelmohsen, Georg Krohne, Joseph R. Pawlik, Niels L. Lindquist & Ute Hentschel Julius-von-Sachs-Institute for Biological Sciences, University of Wuerzburg, Wuerzburg, Germany; Biocenter, Division of Electron Microscopy, University of Wuerzburg, Wuerzburg, Germany...

The Bondi-van der Burg-Metzner-Sachs (BMS) group is the asymptotic symmetry group of asymptotically flat spacetime. It is infinite dimensional and entails an infinite number of conservation laws. According to the black hole membrane paradigm, null infinity (in asymptotically flat spacetime) and black hole event horizons behave like fluid membranes. The fluid dynamics of the membrane is governed...

The asymptotic group of symmetries at null infinity of flat spacetimes in three and four dimensions is the infinite dimensional Bondi-Metzner-Sachs (BMS) group. This has recently been shown to be isomorphic to non-relativistic conformal algebras in one lower dimension, the Galilean Conformal Algebra (GCA) in 2d and a closely related non-relativistic algebra in 3d [1]. We provide a better unders...

Posterior dislocation of the shoulder is a rare injury that occurs secondary to trauma and seizures. Diagnosis is often missed and treatment is challenging. Neglected posterior dislocation is associated with Hill-Sachs lesion which leads to locking of dislocation. Correct diagnosis is achieved by history taking, a physical examination and appropriate imaging. In neglected shoulder dislocation w...

Zusammenfassung In diesem Beitrag wird der Fall einer chronisch verhakten vorderen Schulterluxation bei einem 25-jährigen, geistig retardierten Patienten geschildert, welcher während des ersten COVID-19-Lockdowns eine verspätete orthopädisch-fachärztliche Versorgung erhielt. Die Therapie bestand in offenen Reposition mittels Tuberculum-minus-Osteotomie, Auffüllung Hill-Sachs-Defekts sowie knöch...

The optimum management for recurrent glenohumeral instability with significant humeral head defects remains controversial. The purpose of this study was to compare outcomes and recurrence rates between patients who underwent osteochondral substitute grafting and patients who underwent remplissage to treat recurrent shoulder instability from an engaging Hill-Sachs defect with a Bankart lesion. T...

BACKGROUND A Hill Sachs lesion is a posterior-superior bony defect of the humeral head caused by a compression of the hard glenoid rim against the soft cancellous bone in the context of an anterior instability episode. The presence of these humeral defects increases with the number of dislocations and larger lesions are associated with a greater chance of development of recurrent instability an...