関連ワード:  what is a class 2 injury    what is a grade 2 injury    what is a grade 2 injury mean    what is a class 2 trauma    what is a grade 2 hamstring injury    what is a grade 2 mcl injury    what is a grade 2 knee injury    what is a grade 2 muscle injury    what is a grade 2 brain injury    what is a grade 2 ligament injury