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Almost one child in twenty with trisomy 21 will develop spontaneous dislocation of the hip between learning to walk and the age of 10 years. After the age of two years spontaneous habitual dislocation may occur. If left untreated, acute dislocation, subluxation and fixed dislocation follow in sequence. The natural history of the condition is described and the clinical and radiological features ...

Dislocation pipe diffusion seems to be a well-established phenomenon. Here we demonstrate an unexpected effect, that the migration of interstitials such as carbon in iron may be accelerated not in the dislocation line direction ξ, but in a conjugate diffusion direction. This accelerated random walk arises from a simple crystallographic channeling effect. c is a function of the Burgers vector b,...

INTRODUCTION Dislocation of intermediate cuneiform is a rare injury in English language literature. Dislocation of intermediate cuneiform with undisplaced medial cuneiform fracture has been reported only once. We report the first case of dislocation intermediate cuneiform with displaced medial cuneiform fracture. CASE REPORT A 43-year-old male was diagnosed of dislocation of intermediate cune...

Dislocation of the hip joint in adults is usually caused by high-energy trauma such as road traffic accidents or falls from heights. Posterior dislocation is observed in most cases. However, atraumatic anterior dislocation of the hip joint is extremely rare. We present a case of atraumatic anterior dislocation of the hip joint that was induced by an activity of daily living. The possible causes...

A unique size-dependent strain hardening mechanism, that achieves both high strength and ductility, is demonstrated for penta-twinned Ag nanowires (NWs) through a combined experimental-computational approach. Thin Ag NWs are found to deform via the surface nucleation of stacking fault decahedrons (SFDs) in multiple plastic zones distributed along the NW. Twin boundaries lead to the formation of...

dislocation of the thumb carpometacarpal joint is a rare injury, and only 38 cases have been definitively described in the english-speaking literature. all the reported dislocations have been dorsal. we present a volar form of the thumb carpometacarpal dislocation which was managed surgically after three months from the injury with open reduction and volar ligament reconstrction, with satisfact...

©2004 British Editorial Society of Bone and Joint Surgery doi:10.1302/0301-620X.86B3. 14985 $2.00 J Bone Joint Surg [Br] 2004;86-B:324-32. Posterior dislocation of the shoulder is a rare but clinically and radiologically well-defined entity. It accounts for less than 2% of all dislocations of the shoulder,1,2 but is of diagnostic and therapeutic interest because most are missed on the initial e...

The study of the micro-plastic behavior of rough surface contact is the critical link towards a fundamental understanding of contact, friction, adhesion, and surface failures at small length scales. In the companion paper (Yu et al., J. Mech. Phys. Solids 55, 489-516, 2007), we have studied the onset of surface yielding due to single-dislocation nucleation from a stepped surface under adhesive ...

BACKGROUND AND PURPOSE Patient education and mobilization restrictions are often used in an attempt to reduce the risk of dislocation following primary THA. To date, there have been no studies investigating the safety of removal of mobilization restrictions following THA performed using a posterolateral approach. In this retrospective non-inferiority study, we investigated the rate of early dis...