BACKGROUND Several studies have evaluated the incidence of and risk factors for injuries among wrestlers, but there are limited data in this population. Understanding the incidence and risk factors could provide important information for educational and preventive efforts at the national and international levels. PURPOSE To assess the incidence of and risk factors for fractures and dislocatio...

Traumatic dislocations of the proximal tibiofibular joint are rare and difficult to diagnose. They can present as an isolated case or in association with multiple injuries. They are typically classified into subluxation, anterolateral, posteromedial, and superior dislocations. We report 2 unusual dislocations (posterolateral and inferior) of the proximal tibiofibular joint, both associated with...

Crystal dislocations were invisible until the mid-20th century although their presence had been inferred; the atomic and molecular scale dimensions had prevented earlier discovery. Now they are normally known to be just about everywhere, for example, in the softest molecularly-bonded crystals as well as within the hardest covalently-bonded diamonds. The advent of advanced techniques of atomic-s...

X iv :c on dm at /9 90 53 38 v1 2 3 M ay 1 99 9 Topological Gauge Theory Of General Weitzenböck Manifolds Of Dislocations In Crystals Y. C. Huang B. L. Lin S. Li M. X. Shao Department of Applied Physics, Beijing Polytechnic University, Beijing,100022, P. R. China Department of Transportation Management Engenerring, Northean Jiaotong University, Beijing, 100044, P. R.China Institute of Theoretic...

We investigate the structure and mobility of dislocations in hcp 4He crystals. In addition to fully characterizing the five elastic constants of this system, we obtain direct insight into dislocation core structures on the basal plane, which demonstrates a tendency toward dissociation into partial dislocations. Moreover, our results suggest that intrinsic lattice resistance is an essential fact...

AbsractAll perilunate fracture-dislocations combine bone avulsions, ligament disruptionand fractures in different forms. The most frequent pattern is the dorsal transscaphoidperilunate fracture-dislocation. The reported risk of missed initial diagnosisin perilunate dislocations is as high as 20%. Concerning pathomechanics of theperilunate fracture-dislocation, it should be noted that most dorsa...

In this paper we consider the dynamics of dislocations with the same Burgers vector, contained in the same glide plane, and moving in a material with periodic obstacles. We study two cases: i) the particular case of parallel straight dislocations and ii) the general case of curved dislocations. In each case, we perform rigorously the homogenization of the dynamics and predict the corresponding ...

Dislocation slip is investigated in a metastable  titanium alloy with the Ti-23Nb-0.7Ta-2Zr0.4Si composition (at. %) by in situ straining experiments in a transmission electron microscope (TEM). Moving dislocations have a/2<111> Burgers vectors and glide in {110}, {112} or {123} planes. The mobility of screw dislocations is lowered by punctual defects and the existence of a stable and sessile ...

The fundamental processes controlling the high-temperature interaction of dislocations with precipitates in Al-alloys were investigated in real time by deforming specimens in situ in the transmission electron microscope at elevated temperature. The observations support a bypass mechanism involving the interaction of lattice dislocations with the precipitate–matrix interface dislocations, where ...

case report: we report a 44-year-old man with right femoral nerve palsy following delayed reduction of an anterior dislocation of hip. conclusion: two months after closed reduction, complete clinical recovery of right femoral nerve was achieved and the patient was able to resume his job. introduction: incidence of nerve injury in traumatic hip dislocations is up to 10 %. sciatic nerve is the mo...