The internal stabilization of the Stokes–Oseen equation by feedback point controllers

2013 ◽  
Vol 62 (5) ◽  
pp. 447-450
Author(s):  
Viorel Barbu
2021 ◽  
Author(s):  
William W Wroe ◽  
Bradley Budde ◽  
Joseph C Hsieh

Abstract BACKGROUND AND IMPORTANCE Fractures of C2 are typically managed nonoperatively with good rates of healing. Management decisions are complicated, however, when there are additional fractures in the axis possibly leading to increased instability. Additionally, the techniques used for treating these unstable axis fractures can have either significant complications or permanent loss of range of motion. Here, we present a novel technique for the reduction and stabilization of complex C2 body fracture. CLINICAL PRESENTATION A 34-yr-old woman with a complex C2 body fracture, which included a right pars and left lateral mass fracture, presented after a water slide accident. It was felt that this fracture was both unstable and would not heal in an anatomically acceptable way so an open surgical reduction was needed. After consideration of more traditional fusion and osteosynthesis techniques, we chose to perform a C1-C2 internal stabilization with C1 sublaminar and C2 spinous process wiring. The patient was then instructed to wear a Miami J collar for 3 mo. CONCLUSION The outcome was favorable with good approximation and healing with preserved range of motion.


2021 ◽  
Vol 108 (Supplement_2) ◽  
Author(s):  
A Khajuria

Abstract Introduction The BOAST/BAPRAS updated the open fracture guidelines in December 2017 to replace BOAST 4 Open fracture guidelines; the changes gave clearer recommendations for timing of surgery and recommendations for reducing infection rates. Method Our work retrospectively evaluates the surgical management of open tibia fractures at a Major Trauma Centre (MTC), over a one-year period in light of key standards (13,14 and 15 of the standards for open fractures). Results The vast majority of cases (93%) had definitive internal stabilization only when immediate soft tissue coverage was achievable. 90% of cases were not managed as ‘clean cases’ following the initial debridement. 50% of cases underwent definitive closure within 72 hours. The reasons for definitive closure beyond 72hours were: patients medically unwell (20%), multiple wound debridement’s (33%) and no medical or surgical reason was clearly stated (47%). Conclusions The implementation of a ‘clean surgery’ protocol following surgical debridement is essential in diminishing risk of recontamination and infection. Hence, this must be the gold standard and should be clearly documented in operation notes. The extent of availability of a joint Orthoplastic theatre list provides a key limiting step in definitive bony fixation and soft tissue coverage of open tibia fractures.


2019 ◽  
Vol 109 (1) ◽  
pp. 75-79
Author(s):  
Igor Frangež ◽  
Tea Nizič-Kos ◽  
Matej Cimerman

Intraosseous lipomas are rare benign bone neoplasms with an incidence of less than 0.1%; origin in the calcaneus has been reported in only a few patients. First-line treatment remains conservative, but several surgical techniques have also been described. We describe a 44-year-old woman with increasing pain in her left heel for a year and a half, who noticed swelling on the lateral side of the calcaneus. The patient underwent radiography, magnetic resonance imaging, and computed tomography of her left foot, which was suspicious for an intraosseous lipoma with a threatening calcaneal fracture. We performed a surgical procedure, curettage of the tumor, spongioplastics (by autologous bone transplant and β-tricalcium phosphate), and internal stabilization with a calcaneal plate considering the goal of immediate postoperative weightbearing. Histologic examination confirmed an intraosseous lipoma of the calcaneus. The patient's pain was relieved immediately after surgery. Internal stabilization of the calcaneus allowed the patient to immediately fully weightbear and to return to usual daily activities. Although a benign bone tumor, intraosseous lipoma can cause many complications, such as persistent pain, decreased function, or even pathologic fracture as a result of calcaneal bone weakening. Choosing an appropriate treatment is still controversial. Conservative treatment is the first option, but for patients with severe problems and threatening fracture, surgery is necessary. Internal fixation for stabilization enables immediate postoperative weightbearing and shortens recovery time.


2019 ◽  
Vol 27 (3) ◽  
pp. 153-160
Author(s):  
Nguyen Van Thanh

Abstract We show that the 3D stochastic Navier–Stokes–Voigt equations with linearly multiplicative Gaussian noise can be stabilized in probability by linear internal feedback controllers with support large enough.


Injury ◽  
1988 ◽  
Vol 19 (6) ◽  
pp. 432-435 ◽  
Author(s):  
P.M. Rommens ◽  
P.L.O. Broos ◽  
K. Stappaerts ◽  
J.A. Gruwez

1993 ◽  
Vol 18 (4) ◽  
pp. 527-532 ◽  
Author(s):  
G. R. SENNWALD ◽  
G. SEGMÜLLER

13 patients, 12 female and one male (mean age 63) with pan-trapezial osteoarthritis were treated by a “de la Caffinière” arthroplasty of the first carpometacarpal joint, combined with a scapho-trapezio-trapezoid (STT) arthrodesis. 11 could be reviewed at least 3 years after surgery (average 3 years and 8 months). Non-union of the arthrodesis occured twice, once when no internal stabilization was used, once with the use of the staplizer. No impingement syndrome was recorded, and there was no correlation between the angular position of the scaphoid and mobility of the wrist. Two out of 11 “de la Caffinière” implants had to be removed. Loosening of the stem is unusual, but the cup remained only perfectly in place in two cases. There was no correlation between radiological and clinical findings and the overall result was good or excellent in 8 out of 13 (62%) of the cases. The grip and pinch strength were comparable to the results of the literature. This method cannot be further recommended because of the high rate of re-operation and the risk to the trapezium which has to be further evaluated.


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