author(s)
Sridevi P, Rajalakshmi K and SivaKumar M

abstract
The os-coxae consisted of ilium, ischium and pubis which were all parallel to the longitudinal axis of the vertebral column and were fused one above the other. All the three bones participated in the formation of the perforated acetabulum. The acetabulum presented on its caudo dorsal aspect with a large anti-trochanter for trochanter major of the femur. Ilium had a pre acetabular, acetabular part and post acetabular part which were joined with the spines of lumbo-sacral mass. Ischium was semi cylindrical comprised of cranial and caudal part. The dorsal border of the ischium and ventral border of ilium enclosed within a long incisura ilioischiadica. Pubis a long, slender bone was ventral to ischium and cranially joined to the pre acetabular part of the ilium. In between the pubis and ischium separated by incisura puboischiadica. The caudal extremity was expanded and did not project beyond the ischium. The obturator foramen was incomplete oval shaped and it was formed by the union of ventral border of the ischium and the cranial part of dorsal border of the pubis.