01/02/2026
Let’s talk about rib angle.
It all comes back to the diaphragm, which is very important for the health of the pelvic floor. Why? The diaphragm sits in the bottom of the rib cage, similar to a dome. The pelvic floor sits right underneath in the pelvis. Together, when the diaphragm goes through its range of motion, it pushes the pelvic floor to go through its full range of motion.
1. Diastasis Re**us Abdominis
Now, let’s imagine that you’ve just had a baby. You’ve likely experienced rib flaring as a result of your body’s natural instinct to push the ribs up and open to make room for baby. As a result, you may end up with a wider rib angel. When your infrasternal angle (the angel between the two rib cages) is widened above 90 degrees, it’s going to create a lot more tension through the anterior abdominal wall.
After childbirth, if that anterior abdominal wall doesn’t heal properly, is a diastasis recti (or separation of the abdomen, aka DRA). The wider the rib angle, the more prone you are to have that separation of the abdominal wall. Of course, the more separation between through linea alba (between the two muscle bellies), the less ideal the recruitment and the motor control of those abdominal muscles. In summary: after pregnancy, ribs may be flared, which leads to a higher probability of DRA.
2. Posture
The other reason we want to pay attention to rib angle is because it will affect the way that the rib cage stacks on tip of the pelvis. What we want, more or less, is for the rib cage to be right on TOP of the pelvis (so that the diaphragm and pelvic floor can do their thing today), but also for the sake of having a neutral spine.
3. Neutral Spine
In a neutral spinal position, the intervertebral discs that go between each vertebrae in your spine can tolerate 3x the compressive load under neutral than they can out of neutral. In other words: when the spine is stacked ideally, your discs are less prone to mechanical injury.
In summary, we want:
1. Rib cage on top of pelvis
2. Rib angle to be 90 degrees, more or less
3. Neutral spine