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World Journal of Orthopedics 2016年第7期7卷 426-433页

作者： Raju Vaishya vipul vijay Vikas P Birla Amit K Agarwal Department of Orthopaedics Joint Replacement and ArthroscopyIndraprastha Apollo Hospital

AIM: To compare the postoperative mechanical alignment achieved after total knee arthroplasty(TKA) using computer tomography(CT) based patient specific blocks(PSB) to conventional instruments(CI).METHODS: Total 80 knees were included in the study, with 40 knees in both the groups operated using PSB and CI. All the knees were performed by a single surgeon using the same cruciate sacrificing implants. In our study we used CT based PSB to compare with CI. Postoperative mechanical femoro-tibial angle(MFT angle) was measured on long leg x-rays using picture archiving and communication system(PACS). We compared mechanical alignment achieved using PSB and CI in TKA using statistical ***: The PSB group(group 1) included 17 females and seven males while in CI group(group 2) there were 15 females and eight males. The mean age of patients in group 1 was 60.5 years and in group 2 it was 60.2 years. The mean postoperative MFT angle measured on long-leg radiographs in group 1 was 178.23°(SD = 2.67°, range: 171.9° to 182.5°) while in group 2, the mean MFT angle was 175.73°(SD = 3.62°, range: 166.0° to 179.8°). There was significant improvement in postoperative mechanical alignment(P value = 0.001), in PSB group compared to CI. Number of outliers were also found to be less in group operated with PSB(7 Knee) compared to those operated with CI(17 Knee).CONCLUSION: PSB improve mechanical alignment after total knee arthroplasty, compared to CI. This may lead to lower rates of revision in the PSB based TKA as compared to the conventional instrumentation.

关键词： Knee Replacement Arthroplasty Patient specific jigs Conventional jigs

Dislocation of a constrained total knee arthroplasty with patellar tendon rupture after trivial trauma

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Chinese Journal of Traumatology 2015年第4期18卷 241-244页

作者： Raju Vaishya vipul vijay Abhishek Vaish Orthopedics and Joint Replacement Surgery lndraprastha Apollo Hospitals Sarita Vihar Mathura Road New Delhi 110076 India

Constrained total knee prostheses are used in knees with severe deformities and insufficiency of collaterals to provide stable and mobile knees. Dislocation after constrained knee prosthesis is an extremely rare and dreaded complication. When dislocation is associated with patellar tendon rupture, the management includes restoration of the extensor apparatus along with a stable knee. Repair of the patellar tendon is challenging due to poor soft tissue coverage in the area and a bulky repair can put tension on the wound closure. Ideal method of restoration of the extensor apparatus is a matter of debate. There are various modalities used ranging from primary end-to-end repair, augmentation by medial gastrocnemius flap, semitendinosus and synthetic implants and allograft tendoachilles. We report a rare case of a posterior dislocation of a constrained total knee arthroplasty in association with patellar tendon rupture due to a minor fall after a few weeks of surgery. The first episode was managed by reposition of the dislocation and V-Y plasty of the quadriceps and primary repair. The second episode of dislocation with re-rupture needed augmentation by semitendinosus along with the insertion of the thicker insert. The management of this complex problem along with the review of literature is discussed in this case reoort.

关键词： Dislocations Patellar ligament Arthroplasty Replacement Knee

Outcome of distal end clavicle fractures treated with locking plates

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Chinese Journal of Traumatology 2017年第1期20卷 45-48页

作者： Raju Vaishya vipul vijay Vikram Khanna Department of Orthopaedics Indraprastha Apollo Hospital New Delhi India

Purpose： Fractures of the lateral end of the clavicle are relatively uncommon. These fractures are unstable due to the various deforming forces which act on the fragments as well as the small distal fracture fragment. At most times the deforming forces are not taken into consideration, and the fracture is not fixed securely. In this study, we assessed a fixation technique using the precontoured locking plates to find out whether it provided a stable fixation with good functional outcome. Methods： Totally, 32 patients with lateral end clavicle fracture （Neer＇s Type ll） were included in the study. After the informed consent and preoperative investigations were obtained, open reduction and intemal fixation was done using a 3.5 mm precontoured superior locking plate with lateral extension under general anesthesia. Postoperative X-rays were done on day I and every 6 weeks after operation, until radiological union was achieved. The postoperative pain was assessed using Visual Analogue Scale （VAS） on postoperative days 1, 2 and 10. Postoperatively arm pouch sling was given for 2 weeks followed by active mobilization. Patients were asked to do their daily routine work and avoid lifting heavy weights. The functional outcome was assessed at the end of 2nd and 6th months with the help of Disabilities of the Arm, Shoulder and Hand （DASH} scoring. Results： There were no intraoperative complications in the procedure. The mean VAS score on post- operative day 1 was found to be 5 which decreased to 3 on day 2 and 0 on day 10. The mean DASH score was calculated as 11.63 at the end of postoperative month 2 and then 4.6 at the end of month 6. There was one case of malunion in whom the overhead abduction was restricted but was not painful and was managed conservatively. Conclusion： The precontoured locking plates with lateral extension may be a good method to fix the fractures of the lateral end clavicle, which provide a stable fixation with good functional outcome with very few instan

关键词： Lateral end clavicle fractures Precontoured locking plates Functional outcome

Bilateral segmental pelvic and femoral fractures in a young female： A rare case report

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Chinese Journal of Traumatology 2016年第5期19卷 286-289页

作者： Raju Vaishya Amit Kumar Agarwal Nishint Gupta vipul vijay Department of Orthopaedics and Joint Replacement Surgery lndraprastha Apollo Hospitals New Delhi 110076 India

The management of multiple complicated injured patients remains a great challenge despite advance- ments in modern medical care. We present a rare case of bilateral unstable pelvic fractures associated with bilateral segmental femoral shaft fractures. We have proposed a mechanism of such complex injury pattern and discussed the plan of management. We believe that a timely and aggressive surgical inter- vention to fix all the major fractures soon after medically stabilizing the patient helped our patient tc overcome these serious and lethal injuries. It is necessary to establish an optimal protocol for man- agement of such complex fractures by conducting prospective and multicentric studies in the future.

关键词： Pelvis Femoral fractures Rib fractures

Global Dynamics of a Multi-group SEIR Epidemic Model with Infection Age

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Chinese Annals of Mathematics,Series B 2021年第6期42卷 833-860页

作者： vijay Pal BAJIYA Jai Prakash TRIPATHI vipul KAKKAR Jinshan WANG Guiquan SUN Department of Mathematics Central University of RajasthanBandar Sindri-305817KishangarhAjmerRajasthanIndia Complex Systems Research Center Shanxi UniversityTaiyuan 030006China Department of Mathematics North University of ChinaTaiyuan 030051China Complex Systems Research Center Shanxi UniversityTaiyuan 030006China.

Consider the heterogeneity(e.g.,heterogeneous social behaviour,heterogeneity due to different geography,contrasting contact patterns and different numbers of sexual partners etc.)of host population,in this paper,the authors propose an infection age multigroup SEIR epidemic *** model system also incorporates the feedback variables,where the infectivity of infected individuals may depend on the infection *** the direction of mathematical analysis of model,the basic reproduction number R_0 has been *** global stability of disease-free equilibrium and endemic equilibrium have been established in the term of R_(0).More precisely,for R_(0)≤1,the disease-free equilibrium is globally asymptotically stable and for R_(0)>1,they establish global stability of endemic equilibrium using some graph theoretic techniques to Lyapunov function *** considering a numerical example,they investigate the effects of infection age and feedback on the prevalence of the *** result shows that feedback parameters have different and even opposite effects on different ***,by choosing an appropriate value of feedback parameters,the disease could be eradicated or maintained at endemic ***,the infection age of infected individuals may also change the behaviour of the disease,global stable to damped oscillations or damped oscillations to global stable.

关键词： Multi-group model Infection age Feedback Graph-theoretic approach Lyapunov function