A possible cause for a painful total knee prosthesis is flexion gap asymmetry with medial or lateral instability despite adequate axial and rotational alignment of both components and adequate extension gap balancing. To avoid component exchange, ligament advancement techniques can be used. Soft tissue procedures carry the risk of insufficiently stable scarring. Epicondylar sliding osteotomies ...

Torsional deformities of the femur and/or tibia often go unrecognized in adolescents and adults who present with anterior knee pain, and patellar maltracking or instability. While open and arthroscopic surgical techniques have evolved to address these problems, unrecognized torsion may compromise the outcomes of these procedures. We collected a group of 16 consecutive patients (23 knees), with ...

The surface structural phases of Ca(2-x)SrxRuO4 are investigated using quantitative low energy electron diffraction. The broken symmetry at the surface enhances the structural instability against the RuO6 rotational distortion while diminishing the instability against the RuO6 tilt distortion occurring within the bulk crystal. As a result, suppressed structural and electronic surface phase tran...

In the presence of a strong magnetic field and under conditions as realized in the crust and the superfluid core of neutron stars, the Hall drift dominates the field evolution. We show by a linear analysis that, for a sufficiently strong large-scale background field depending at least quadratically on position in a plane conducting slab, an instability occurs which rapidly generates small-scale...

5-dimensional Einstein-Maxwell-Chern-Simons theory with Chern-Simons coefficient λ = 1 has supersymmetric black holes with vanishing horizon angular velocity, but finite angular momentum. Here supersymmetry is associated with a borderline between stability and instability, since for λ > 1 a rotational instability arises, where counterrotating black holes appear, whose horizon rotates in the opp...

Aims. We aim to assess whether magneto-rotational instability (MRI) can exist in a turbulent state generated by gravitational (GI). investigated the magnetic field saturation and elucidated ability of GI turbulence act as dynamo. Methods. The results were obtained numerical simulations using magnetohydrodynamics code Athena . A sub-routine solve Poisson equation for self-gravity three-dimension...