For example, arachnodactyly, scoliosis, pectus deformity, and OA are features of STL1; however, tall stature, dolichocephaly, dolichostenomelia, malar hypoplasia, feet deformitiy, and dural ectasia have not been associated with this syndrome (Table 2)3,36. Here, COL2A1 is linked to congenital contractural arachnodactyly.