Shoulder mobility is something we assess with almost every patient we work with here at Strong Performance Chiropractic in the Johns Creek and Alpharetta area.

What surprises people is that when we see limited shoulder motion, we don’t just look at the shoulder. We look at the thoracic spine too.

The reason is pretty simple. Your shoulder blade sits on your rib cage, and your rib cage is influenced by the position of your thoracic spine. If that foundation changes, the position and movement of the shoulder blade can change with it.

We see this often with excessive thoracic kyphosis and rotation of the thoracic spine.

Try This Yourself

Sit or stand tall and raise both arms as far overhead as you comfortably can.

Pay attention to how far they go.

Now exaggerate a slouched position. Round your upper back, let your shoulders come forward, and try raising your arms overhead again.

Feel different?

Now straighten back up and try it one more time.

This is one of my favorite demonstrations because you can immediately feel how changing the position of your thoracic spine changes what your shoulder is able to do.

Researchers have measured this too, and the numbers back up exactly what you just felt.

Healthy adults were put in both an erect and a slouched position and asked to raise their arm out to the side. Slouched, they lost an average of 23.6 degrees of shoulder motion. Same joint. Just a different starting position for the spine behind it.

Here’s the part athletes should really pay attention to.

Once the arm got up to horizontal, strength dropped too. Slouched posture cost people 16.2% of their shoulder force. Down at their side, no difference. It was only once the arm went up and the shoulder blade had to work through that rounded foundation that the strength gap showed up.

Same person. Same shoulder. Different starting position.

And it’s not a one-off result. Other researchers ran people through three different sitting postures, erect, a little slouched, and really slouched, and found a clear pattern. The more the upper back rounded forward, the less shoulder motion was available, whether they were testing flexion, abduction, or rotation. Part of the reason is real estate. Round your upper back and you actually close down the small gap under your acromion where your rotator cuff tendons have to slide through. Stand tall and that space opens back up.

Why Should an Athlete Care?

Think about how often you need your arms overhead.

Overhead pressing, pull-ups, snatches, throwing, swimming, and serving a tennis ball all require your shoulder to move while your shoulder blade works with the thoracic spine.

If the thoracic spine puts the shoulder blade in a less favorable starting position, the shoulder still has to find a way to complete the movement.

That’s where compensation comes in.

A common response to a tight shoulder is to stretch the shoulder more. Sometimes that’s exactly what you need.

But sometimes the shoulder isn’t the reason the shoulder is tight.

If the thoracic spine is excessively rounded or rotated, I want to know what position that’s putting the shoulder blade in and what the tissues around the shoulder have to do to compensate.

That’s especially important when you’re repeatedly loading that position in the gym or in your sport.

Rotator cuff problems, labral injuries, and other shoulder issues can sometimes feel like they came out of nowhere. In reality, tissue is being loaded over thousands of repetitions before an injury finally gets your attention.

That doesn’t mean poor thoracic posture caused the injury. Shoulder injuries are more complicated than that. Throwing alone puts the rotator cuff through some brutal moments, getting pinched in one phase and yanked eccentrically in another. Posture is one piece of a much bigger picture, not the whole story.

But it’s a piece researchers keep coming back to. When the shoulder blade stops moving the way it’s supposed to, meaning it loses that posterior tilt and upward rotation as the arm goes overhead, that pattern shows up again and again in people dealing with impingement and rotator cuff problems. It’s the same shoulder blade motion a slouched thoracic spine messes with. That’s part of why correcting thoracic posture is a standard piece of how clinicians address scapular dysfunction in the first place.

So if your shoulder is repeatedly working from a poor position, it’s worth asking whether you’re only treating the painful tissue or also addressing the mechanics around it.

This Is a Pattern We See Often

This isn’t a one-time fix we stumbled into with a single patient. It’s one of the most common patterns I see with athletes who train overhead, whether that’s CrossFit, weightlifting, baseball, or swimming.

A patient comes in with shoulder pain every time they perform overhead lifts. They want to keep training, but pain is limiting how much weight they can put overhead. Instead of focusing only on the shoulder, we also work on thoracic mobility and correcting excessive thoracic kyphosis.

Time and again, as thoracic posture and mobility improve, so does the ability to train overhead. Patients who were stuck fighting the same shoulder pain for months start moving past it, and eventually lift heavier without being limited by that pain.

That’s why I don’t automatically assume a shoulder mobility problem needs another shoulder stretch.

Sometimes we need to look at what the shoulder is sitting on.

Before you keep stretching the shoulder, take a look at the spine behind it.

If Shoulder Pain Is Holding You Back

If you’re in Johns Creek, Alpharetta, Cumming, or anywhere else around the Atlanta area and you’re dealing with shoulder pain that isn’t improving no matter how much you stretch it, this is usually where we start. We assess your thoracic spine, your shoulder blade mechanics, and your shoulder itself, not just the tissue that hurts.

Book a free discovery call and let’s figure out what’s actually driving your shoulder pain.