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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

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.

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.