Your ischial tuberosity is the lower part of your pelvis that's sometimes referred to as your sit bones. It helps to absorb your weight when you sit.

Which part of the hip bone do you sit on?

The ischial tuberosity is another area where many muscles attach. It's also the part of the hip bone that we sit on. The socket for the hip joint is called the acetabulum.

What are the bones called that you sit on?

As I mentioned, what we commonly refer to as our “sit bones or sitting bones” are more technically called the ischial tuberosities. Ischial refers to the ischium, which is the posterior (back), inferior (lower) portion of the three fused bones that make up the pelvis. Tuberosity refers to a large raised bump on a bone.