Q & A: Sitting Bones

Male vs female pelvis LT

Image via Wikipedia

What exactly are the sitting bones or sit bones?

The sit bones are literally what you sit on.  The anatomical name is: Ischial Tuberosity.

A tuberosity is another word for roundness.  Think of the shape of an edible tuber, like a turnip or sweet potato. In the diagram of the human pelvis (male pelvis on the left, female pelvis on the right) you will notice that at the centre is the sacrum which you have already learned consists of 5 fused vertebrae. What look like elephant ears on either side of the sacrum are the ilium.  At the bottom are two round holes which look like a mask with two eye holes.  At the most bottom outer surface of the eye holes are the sit bones. When sitting on a hard surface with good posture you will feel these bony prominences.  Try it.  You may need to pull some of your buttock flesh out of the way depending on how much buttock you have covering these bones.  Tip the pelvis forward and back or side to side to become aware of these important landmarks.


  1. I guess this might be outside your field. I had a spinal cord stroke and spend a lot of time in my wheelchair with air cushion. However, after 4 years I now have problems with my sitting bones which, I fhink must be tearing on the flesh, what’s left. Nobody has come upo with any suggestions to at least lessen the pain. It is the same in bed. The only time I don’t feel it is when I sleep. 5 hoiurs in general. Cheers

    1. Apologies for the delay in replying to your question. I’ve been offline for a couple years. I don’t have any experience with prolonged sitting in a wheelchair. I will give some thought to your question. Since a lot of time has passed since you wrote this message have you discovered any relief to your discomfort?

      1. There’s usually a reason for experiencing pain, it could be from an anatomical imbalance, due to injury or repetitive strain etc. Making corrections to anatomical patterns would be the treatment. First is to analyze your alignment and your daily physical habits.

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