HLA-B*27:05:02 is associated with increased risk of enthesitis, dactylitis, and symmetric sacroiliitis, whereas HLA-B*08:01:01 and HLA-C*07:01:01 haplotypes are associated with joint fusion and deformities, asymmetrical sacroiliitis, and dactylitis30. Here, HLA-C is linked to Sacroiliac arthritis.