"The genotype and allele frequencies of the COL2A1 genetic polymorphisms (rs1793953 and rs2276454) and the Aggrecan VNTR polymorphisms differed significantly between the case group and the control group.the genotype and allele frequencies of the COL2A1 genes rs1793953 and rs2276454 and Aggrecan VNTR significantly differed in terms of Pfirrmann grades III IV and V"xsd:string