BACKGROUND Recent studies have shown effective clinical results after arthroscopic Bankart repair (ABR) but have shown several risk factors for re-dislocation after surgery. We evaluated whether patients are at a risk for re-dislocation during the first year after ABR, examined the recurrence rate after ABR, and sought to identify new risk factors. METHODS We performed ABR using bioabsorbable...

Discrete dislocation dynamics (DD) simulations in conjunction with stereo and in situ straining transmission electronic microscopy (TEM) were used to study dislocation motion in thin Cu foils. Stereo imaging prior to and following in situ tensile straining is utilized to describe the three-dimensional (3D) evolution of dislocation structures with incremental straining and observation by TEM. Th...

We present a kinetic Monte Carlo method for simulating dislocation motion in alloys within the framework of the kink model. The model considers the glide of a dislocation in a static, three-dimensional solute atom atmosphere. It includes both a description of the short-range interaction between a dislocation core and the solute and long-range solute-dislocation interactions arising from the int...

Simple shear of a constrained strip is analyzed using both discrete dislocation plasticity and strain gradient crystal plasticity theory. Both single slip and symmetric double slip are considered. The loading is such that for a local continuum description of plastic flow the deformation state is one of homogeneous shear. In the discrete dislocation formulation the dislocations are all of edge c...

The interaction dynamics between dislocations and radiation induced sessile self-interstitial atom (SIA) dislocation loops in FCC metals are investigated. As a result of dislocation line flexibility, its equilibrium configuration is found to be sensitive to the elastic field of nearby SIA dislocation loops. Dislocation line flexibility also influences the critical stress to free trapped disloca...

BACKGROUND AND PURPOSE Several mechanisms are responsible for patellar dislocation. We investigated how the primary pathomechanism relates to patient characteristics and the outcome. METHODS 126 patients (81 females) with primary patellar dislocation reported the knee position before the episode, the movement during it, and whether the patella was locked in dislocation. The median age was 20 ...

management of first shoulder dislocation following reduction remains controversial. the two main options are immobilisation and arthroscopic stabilisation. the aim of this article is to highlight some of the issues that influence decision making when discussing management options with these patients, including natural history of the first time dislocation, outcomes of surgery and non-operative ...

The statistical characteristics of dislocation-induced elastic distortion fi elds in deformed FCC crystals are investigated both experimentally and theoretically. Discrete dislocation realizations are generated by the discrete dislocation dynamics method and the induced elastic distortion fi elds are computed by solving the corresponding boundary value problem. Moreover, sample three-dimensiona...

Recently, a dislocation free deformation mechanism was proposed by Kiritani et al., based on a series of experiments where thin foils of fcc metals were deformed at very high strain rates. In the experimental study, they observed a large density of stacking fault tetrahedra, but very low dislocation densities in the foils after deformation. This was interpreted as evidence for a new dislocation...