Stable crystalline phosphorus ylides are obtained in excellent yields from the 1:1:1 addition reactionbetween hydantoins or thiohydantoins and dialkyl acetylenedicarboxylates in the presence oftriphenylphosphine. These phosphoranes undergo smooth intramolecular Wittig reaction followedby an electrocyclic ring opening to produce dialkyl (E)-2-(2,5-dihydro-5,5-diaryl-2-thioxo-1H-imidazol-4-yl)fum...

conclusions the treatment of symptomatic ecu instability is still controversial, especially for acute dislocations. depending on the type of injury many surgical techniques have been proposed. combination of direct repair of the tendon’s subsheath and reinforcement with an extensor retinaculum graft is a reliable option. introduction dislocation/subluxation of the extensor carpi ulnaris (ecu) t...

Traumatic anterior dislocation of the hip is an extremely rare condition in children and open dislocation is even rarer. Thisisusually caused by high-energy trauma. In the current study, we present a case of an eight-year-old child suffering froman open anterior–inferior dislocation of the right hip concomitant with pelvic ring disruption and an ipsilateral open distalfemoral fracture (Salter-H...

Nowadays, piezoelectric materials have wide applications in various industries. Therefore, investigation of these materials and their applications has a special importance. In this paper first, the natural frequencies of a traveling-wave piezoelectric motor are achieved, using finite elements simulations. Then, applying an alternative electrical voltage to the piezoelectric ring, a traveling wa...

Cyclotrimethylene trinitramine (RDX) crystalizes in the orthorhombic α-phase at the ambient pressure and temperature. In principle, the point defects commonly found in monatomic crystals, such as vacancies and interstitials, may exist in RDX as well. However, in molecular crystals one encounters additional point defects associated with the distortion of the molecules. A set of rotational defect...

We aim to present a case of retinal detachment secondary to capsular tension ring dislocation following cataract surgery. A 45-year-old man who underwent cataract surgery 2 years previously presented with decreased vision in his left eye. The patient's posterior capsule was intact with a well-located posterior chamber intraocular lens. Fundus examination revealed retinal detachment with retinal...

UNLABELLED We report here a unique case of a 3 year neglected rotatory tibiofemoral dislocation associated with a lateral patellar dislocation. The rotational deformity was gradually corrected using a Taylor spatial frame and the patella was realigned by tibial tubercle osteotomy and transfer. The patient also underwent multiple soft tissue releases and quadricepsplasty to improve knee flexion....

Posttraumatic osteonecrosis of the femoral head (ONFH) is the most serious complication after fracture dislocation of the femoral head. The rate of this complication was reported to range from 1.7% to 40%. Although the development of posttraumatic osteonecrosis normally occurs within 2 years of injury, there are some reports of the late development ONFH. The authors encountered a case of posttr...

BACKGROUND Recent reports on the treatment of a dislocation of the hip due to developmental dysplasia have documented conflicting data on the importance of the ossific nucleus in the development of postreduction ischemic necrosis. Delaying reduction until the ossific nucleus is present bypasses the time-period of maximal osseous remodeling of the hip, thereby possibly increasing the need for fu...

We report a case of a unilateral testicular dislocation to the superficial inguinal region associated with a lateral compression type pelvic ring injury (OTA classification 61-C3.3a2, b2, c3) and left T-shaped acetabulum fracture (OTA classification 62-B2) in a 44-year-old male who was in a motorcycle accident. The testicular dislocation was noted during the emergency department primary survey,...