Carpal instability is a rare injury of the wrist, but it can cause adverse disability and morbidity of the patient. Lunate dislocation is the fourth and last stage of perilunate dislocation. Bilateral perilunate dislocation is an even more uncommon injury, and only several cases have been reported in literature. We are presenting a case of bilateral perilunate dislocation of wrists in 27-year-o...

The article describes a model of interaction dynamics between a dislocation and dipolar dislocation loops. The interaction is essential for dipolar dislocation structure formation in early stages of a hardening process. For the description of the dislocation curve a direct parametric approach is employed whereas the loops are treated as rigid objects. The model equations are solved approximatel...

To determine the natural history of dislocation of the hip in cerebral palsy, and to evolve methods to predict dislocation, the notes and radiographs of 462 patients with cerebral palsy were reviewed. Dislocation occurred in 10% of patients by progressive migration and subluxation of the proximal femur in the presence of acetabular dysplasia. Statistical analysis identified the radiographic fea...

The correspondence theorem which relates the solutions of displacement boundary value problems in classical and couple stress elasticity is formulated and applied to derive the solutions for edge and screw dislocations in an infinite medium. The effects of couple stresses on the dislocation strain energy is evaluated for both types of dislocations. It is shown that within a radius of influence ...

Anterior dislocation of the hip is uncommon compared with posterior dislocation. Thompson and Epstein (1951) collected 204 cases of dislocation of the hip from the Los Angeles Hospital records in twenty-one years. Of these, 180 cases were posterior whereas only eighteen were anterior. In the last ten years seven cases of anterior dislocation presented themselves to us. Three dislocationswereacu...