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Different femoral tunnel positioning methods have their own advantages and disadvantages, and there is no definite evidence that one is superior than the rest. Different femoral tunnel positioning methods have their own advantages and disadvantages, and there is no definite evidence that one is superior than the rest. To review the recent research progress of different types of stem cells in the treatment of ischemic stroke. By searching the PubMed database, a systematic review had been carried out for the results of applying different types of stem cells i