AC Joint Injuries: Why Your Upper Back Determines Trauma Tolerance
Key insights: 60-second read
- AC joint injuries are often seen as purely traumatic - but the state of your tissues before trauma matters just as much.
- Upper back and ribcage stiffness may rob you of your ability to absorb impact - a stiff thoracic spine can't dissipate force, leaving the AC joint vulnerable.
- A simple lacrosse ball exercise can improve your "bend not break" capacity - by restoring mobility to the upper back, you create a better buffer against trauma.
- Local + telehealth support available - personalised physio assessment in Port Macquarie or via video consult.
An AC joint injury is often the result of trauma to the shoulder. Whether it's a fall onto the tip of the shoulder or a heavy bump, enough trauma can separate even the most robust AC joint.
But what if there was more to this equation than just "too much" trauma? What if the state of the AC joint and its surrounding structures BEFORE being exposed to any trauma had an effect on the severity of the consequences experienced AFTER the trauma? This makes sense intuitively.
The better something is before an accident, the more likely it is to bend rather than break. If something is already somewhat dysfunctional beforehand, it may have less chance of buffering that trauma and coming out unscathed.
And clinically, I'm finding there might be more we can do to reduce the severity of AC joint injury than we currently realise. We just need to look beyond the AC joint in isolation and consider what other structures might decrease our ability to buffer shoulder trauma, leaving the AC joint less able to cope with an accident.
Article Outline
Video: The Hidden Upper Back Connection to AC Joint Injuries
In this video, I discuss how relatively covert upper back and ribcage restriction might rob us of our ability to absorb accidental trauma to the AC joint. I also go through a really simple exercise you can do to eliminate that hidden upper back dysfunction.
The "Bend Not Break" Principle
Think of it this way: two identical twigs, one dry and brittle, one green and flexible. When you apply the same force to both, which one snaps and which one bends? The answer is obvious. The same principle applies to your body.
When you experience trauma - a fall, a collision, a heavy impact - the outcome isn't determined solely by the force applied. It's determined by the interplay between that force and your body's ability to absorb and dissipate it.
If your tissues, joints, and surrounding structures are already in an optimal state, you have a much better chance of coming through that trauma with minor or no injury. If there's pre-existing stiffness, restriction, or dysfunction, that same force may overwhelm your capacity to cope.
The Hidden Connection: Upper Back and Ribcage Stiffness
Clinically, I'm finding that the key area influencing AC joint resilience is the upper back (thoracic spine) and ribcage. Here's why:
- The shoulder blade (scapula) sits on and moves across the ribcage.
- The ribcage attaches to the thoracic spine.
- The AC joint connects the collarbone (clavicle) to the shoulder blade.
When the upper back and ribcage are stiff and restricted, the shoulder blade can't move optimally. This creates a more rigid, less adaptable system. When a force hits the shoulder, that rigidity means less force dissipation and more force transmitted directly to the AC joint.
Conversely, a mobile, well-functioning upper back allows the shoulder blade to move, absorb, and redirect force, protecting the AC joint from the full brunt of the impact.
The Simple Exercise: Upper Back Mobilisation
The video demonstrates a simple yet powerful technique to improve upper back mobility using a lacrosse ball.
How to perform it:
- Place a lacrosse ball (or tennis ball) on the floor.
- Lie on your back with the ball positioned next to your spine, targeting the upper back region.
- Gently relax your body weight onto the ball.
- Move slowly up and down, searching for spots that feel particularly stiff or restricted.
- When you find a stiff spot, stay there. Apply steady, gentle pressure for 60-90 seconds, breathing deeply.
- Work both sides of your spine, spending more time on the side that feels tighter.
The goal is not to cause pain, but to encourage stiff spinal joints and soft tissues to release and soften. Over time, this can significantly improve the mobility of your upper back, enhancing your body's ability to absorb and dissipate force.
Related: Why Shoulder Pain is Often a Consequence of Something Else - a deeper look at how hidden factors contribute to shoulder issues.
Helpful equipment
- Lacrosse Ball - for mobilising stiff upper back joints
Please note: This is an affiliate link. I may earn a small commission if you purchase through it, at no extra cost to you.
Test this out for yourself and let me know what you find!
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- Grant
Frequently Asked Questions
1. Can improving my upper back mobility really prevent AC joint injuries?
While no intervention can guarantee injury prevention, improving upper back mobility can enhance your body's ability to absorb and dissipate force. A more mobile thoracic spine allows your shoulder blade to move more freely, which can reduce the force transmitted to the AC joint during trauma. It's about improving your "bend not break" capacity.
2. How often should I do the lacrosse ball exercise?
Daily can be very helpful, especially in the initial stages. Even 5-10 minutes a day can make a significant difference over time. Focus on the stiff spots you identify, and be consistent. As your mobility improves, you can reduce frequency to a few times per week for maintenance.
3. What if I've already injured my AC joint - is it too late?
It's never too late. While an existing AC joint injury needs appropriate management, addressing the underlying upper back mobility can still be beneficial. It may help with the rehabilitation process and reduce the risk of future issues. Always consult with a physiotherapist for a personalised assessment and treatment plan.
One key insight
"The better something is before an accident, the more likely it is to bend rather than break. Upper back and ribcage stiffness may rob you of your ability to absorb trauma, leaving the AC joint vulnerable."
Struggling With Shoulder Pain or Want to Prevent Injury?
If you'd like help uncovering the underlying factors affecting your shoulder health, a thorough assessment can help. Learn more about our shoulder pain physiotherapy services in Port Macquarie.
Want personalised guidance?
If you'd like help with your shoulder or any other persistent issue, you can book with Grant either in Port Macquarie or via an online telehealth consultation.
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