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21 results on '"Cao, Jian-Gang"'

8. Hybrid graft vs autograft in anterior cruciate ligament reconstruction: a meta-analysis

Author

Wang,Lei, Cao,Jian-gang, and Liu,Jun

Subjects
reconstruction, Therapeutics and Clinical Risk Management, autograft, anterior cruciate ligament, hybrid graft, Original Research
Abstract

Lei Wang,1 Jian-gang Cao,2 Jun Liu1 1Department of Joint Surgery, Tianjin Hospital, Tianjin, People’s Republic of China; 2Department of Sport Medicine, Tianjin Hospital, Tianjin, People’s Republic of China Purpose: We conducted this meta-analysis to evaluate the efficacy of hybrid grafts in anterior cruciate ligament reconstruction (ACLR).Methods: We performed an electronic search of the Cochrane Library, PubMed, Embase, and ScienceDirect from the inception of these databases to February 2018, based on the terms “anterior cruciate ligament or ACL reconstruction”, “autograft”, “hybrid”, and “augment”. Relevant journals and conference proceedings were searched manually. Quality assessment, data extraction, and calculation of data from the included studies were conducted independently by two reviewers using RevMan 5.1.Results: One randomized controlled trial and eight nonrandomized controlled trials met inclusion criteria. Larger graft diameters were found in the hybrid-graft group (mean difference -1.47, P=0.0001). There was no significant difference in failure rate (OR 2.13, P=0.21), retearing (OR 2.23, P=0.12), revision of ACLR (OR 1.05, P=0.87) or reoperation (OR 1.27, P=0.35). Subgroup analysis showed that hybrid-graft patients with meniscus injury suffered more revision (OR 4.10, P=0.02) and reoperation (OR 5.74, P=0.001). Both autografts and hybrid grafts performed similarly in most knee-score systems. However, autograft patients had better KT-1000 (mean difference 0.24, P=0.05) and quality-of-life results on the Knee Injury and Osteoarthritis Outcome Score measure (mean difference 7.23, P=0.05).Conclusion: This meta-analysis of the current literature indicates similar performance of hybrid or autologous grafts in ACLR, though hybrid grafts had larger diameters than autografts. Other potential factors to influence failure, revision, or postoperative knee function, such as irradiation, age at reconstruction, meniscus injury/treatment, and hybrid-graft remodeling, should be investigated further. Keywords: hybrid graft, autograft, anterior cruciate ligament, reconstruction

Published
2019

10. Analysis and Suppression of Electromagnetic Compatibility of High Speed Railway Traction Current Harmonic to Track Circuit

Author

Feng Jian and Cao Jian Gang

Subjects
Computer science, 020208 electrical & electronic engineering, Electromagnetic compatibility, Topology (electrical circuits), 02 engineering and technology, Track circuit, law.invention, Harmonic analysis, Rectifier, Electromagnetic coil, law, Electric locomotive, 0202 electrical engineering, electronic engineering, information engineering, Harmonic, Electronic engineering
Abstract

With the construction of high-speed railway and passenger dedicated line, the electric locomotive and power supply return system are becoming more and more complex, and the interference to the track circuit is more and more. In order to reduce the influence of the harmonic current on the EMC of the track circuit, this paper proposes a method based on the multiple control strategy. Firstly, the structure and topology of multichannel control rectifier are introduced, and then the influence of carrier modulation and carrier drift on harmonic voltage and current of train is analyzed in detail. Finally, the effectiveness of harmonic analysis method and harmonic suppression method is verified by simulation and experiment.

Published
2020

11. Harmonic Analysis and Suppression Method of Train Network Side Based on Multiplex Control Strategy

Author

Cao Jian gang and Feng Jian

Subjects
Computer science, 020209 energy, 020208 electrical & electronic engineering, Control (management), Topology (electrical circuits), Carrier shift, 02 engineering and technology, Harmonic analysis, Rectifier, Harmonics, Electric locomotive, 0202 electrical engineering, electronic engineering, information engineering, Harmonic, Electronic engineering
Abstract

This is the paper style requirement for the Chinese Control Conference. The writers of papers should and must provide normalized electronic documents in order for readers to search and read papers conveniently. In order to reduce the harmonics pollution by AC drive electric locomotive and EMU in traction power supply, this paper presents a side harmonic suppression method for train network based on multiple control strategy. Firstly, the structure and topology of multiplex control rectifier are introduced, then the influence of carrier modulation and carrier shift on train harmonic voltage and current is analyzed in detail. Finally, the validity of the harmonic analysis method and the effectiveness of the harmonic suppression method are verified by simulation and experiment.

Published
2019

21. [Management of femoral neck fracture post total knee arthroplasty].

Author

Sun ZH, Liu J, Cao JG, and Ren KJ

Subjects
Aged, Aged, 80 and over, Arthroplasty, Replacement, Hip, Female, Fracture Fixation, Internal, Humans, Male, Middle Aged, Risk Factors, Treatment Outcome, Arthroplasty, Replacement, Knee adverse effects, Femoral Neck Fractures etiology, Femoral Neck Fractures surgery, Postoperative Complications surgery
Abstract

Objective: To investigate the risk factors, management and prognosis of femoral neck fracture post total knee arthroplasty (TKA)., Methods: From January 2003 to August 2009, 45 cases of femoral neck fracture post TKA were treated. There were 8 males and 37 females with an age range of 56 - 81 years old. Among them, there were ipsilateral (n = 36) and contralateral (n = 9) femoral neck fractures. Due to the fracture site and type, the treatment plans were formulated. And a follow-up was conducted to record the Harris hip score and complications., Results: The incidence of femoral neck fracture following TKA and osteoporosis had a linear correlation. And the fracture rate increased with the aggravation of osteoporosis. The stability of ipsilateral fracture group was lower than those of contralateral fracture and no fracture groups. Except for 4 mortality cases, 41 patients were followed up for 2 to 7 years with an average period of 3.6 years. There were 12 patients in the cannulated screw fixation group. The outcomes were fracture healing (n = 5) and femoral head necrosis (n = 7). Twenty-five cases underwent femoral head replacement. And 3 died and second fracture occurred in 3 cases. Eight cases underwent total hip arthroplasty. And 1 died and there was 1 case of second fracture. The Harris scores of the cannulated screw fixation group was significantly lower than the hip replacement groups (q test, P < 0.05)., Complications: After internal fixation, 7 cases suffered femoral head necrosis and underwent femoral head replacement. And secondary fractures after hip replacement occurred in 4 cases and they were treated by plate and cable or LISS (less invasive stabilization system) system., Conclusion: Femoral neck fracture following TKA is usually caused by a low-energy injury. Osteoporosis is one of its high-risk factors. Knee instability is associated with ipsilateral femoral neck fracture. Clinically it can be treated by internal fixation or hip arthroplasty. And internal fixation of femoral neck fracture frequently induces femoral head necrosis. And femoral head replacement is applicable.

Published
2011

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