Difference Between Pelvis and Pelvic Girdle

Pelvis vs Pelvic Girdle

Human skeletal system is mainly composed of bones, cartilages, tendons and ligaments. It serves as a supporting structure to the body by making a framework and also providing support surfaces for muscle attachments. Pelvic bones or hip bones attach the lower extremity to the axial skeleton. These bones transmit the upper body weight to the lower limbs and support the visceral organs in the pelvis.

Pelvic Girdle

Pelvic girdle is composed of two bones called os coxae. Each os coxae is formed by the fusion of three different bones; ilium, ischium, and pubis. Acetabulum is the hole which is formed by the fusion of these three different bones. These three bones are seen separately during the childbirth. But in adults these bones are fused and form a single bone. Pelvic girdle basically encircles the body and provides attachment sites for the lower extremity. It also protects and supports lower organs such as the urinary bladder and genital organs, as well as developing fetus in pregnant women.


Pelvis is a combination of several bones, composed of two coxal bones joined posteriorly by the sarcrum and interiorly by pubic symphysis. The center of the pelvis called pelvic cavity contains the genital organs and rectum. Pelvis greatly differs between males and females. Female pelvis is small, more delicate and the iliac crests are farther apart, whereas in males, pelvis is massive and the iliac crests are closer together. These differences in females are basically due to their role of pregnancy and childbirth.

What is the differences between Pelvis and Pelvic Girdle?

• Pelvic girdle is a bony structure made up of two bones, whereas pelvis is a deep, bony basin like structure.

• Pelvic girdle is composed of two coxal bones, whereas pelvis is composed of all the coxal bones and also sacrum and coccyx.