A torn Rotator Cuff my explain where you are injured.
But does it explain how the rest of your shoulder is functioning?

When someone says, "I tore my rotator cuff," where does everyone immediately focus?

The torn tendon.

And understandably so.

A rotator cuff tear can cause pain, weakness, and difficulty raising or rotating your arm. For golfers, that can mean struggling through a full swing, losing control during the short game, or simply having trouble getting comfortable at address.

But here's a question worth asking:

What if the injured tendon isn't the only part of your shoulder that needs attention?

What about the other muscles responsible for controlling, stabilizing, and moving that joint?

Are they producing adequate force?

Are muscular limitations influencing how your shoulder handles movement and loading?

At Golf MATchanics, this is where Muscle Activation Techniques™ (MAT) becomes part of the conversation.

Rather than focusing exclusively on the injured tendon, we evaluate muscular function throughout the shoulder to identify limitations that may be affecting movement, stability, and strength.

Because knowing what's injured matters.

​But understanding what the rest of your muscular system can do matters, too.

THE GOLFER'S MYTH: IT'S ALL ABOUT THE TORN TENDON

"If I tear my rotator cuff, the only thing I need to worry about is the torn tendon."

Not necessarily.

The injured tendon absolutely matters. A suspected tear needs proper medical evaluation, especially following an injury that produces sudden pain, weakness, or loss of function.

But the shoulder is a complicated system of muscles, tendons, bones, and joints working together.

Even when imaging identifies a specific injury, that doesn't tell us everything about the muscular function surrounding the joint.

A diagnosis tells us what tissue may be damaged.

A muscular assessment helps us understand what the surrounding muscles are capable of doing.

​Those are two different pieces of information, and both can matter when developing a plan to restore shoulder function.

UNDERSTANDING SHOULDER STABILITY: THE GOLF BALL ON A TEE

Imagine a golf ball sitting on a tee.

That's a useful way to picture how your shoulder is structured.

The golf ball represents the head of your humerus, or upper arm bone.

The tee represents the glenoid cavity, the shallow socket located on your shoulder blade.

Together, they form your glenohumeral joint.

Unlike the hip, which has a deeper socket, the shoulder has tremendous freedom of movement.

You can raise your arm overhead, reach behind your back, rotate outward, and move across your body.

But that freedom comes with a trade-off.

The shoulder relies heavily on muscular control to maintain stability during movement.

Now imagine several elastic bands attached to that golf ball, each pulling in a different direction.

Those bands represent the different lines of force produced by your shoulder muscles.

When those muscles work together, they help control the position of the humeral head within the glenoid cavity.

When muscular force production is limited, the shoulder may have difficulty managing certain positions or loads.

That doesn't automatically mean the joint is unstable or that an injury will occur.

​But it gives us a reason to investigate how the surrounding muscles are functioning.

THE ROTATOR CUFF: FOUR MUSCLES, ONE IMPORTANT RESPONSIBILITY

Most golfers recognize the term rotator cuff, but many don't understand what those muscles actually do.

Your rotator cuff consists of four muscles.      
Muscle                                            Primary function
Supraspinatus                               Assists with arm abduction and shoulder stabilization
Infraspinatus                                 External rotation and stabilization
Teres minor                                   External rotation and stabilization
Subscapularis                               Internal rotation and stabilization

Each muscle contributes to movement, but its role can change depending on the position of the humerus and the direction of force.

And their responsibilities extend beyond rotating the arm.

The rotator cuff helps compress and control the humeral head against the glenoid cavity as the shoulder moves.

This contributes to something called joint centration.

What Is Joint Centration?
Joint centration refers to maintaining an appropriate relationship between joint surfaces as movement and forces occur.

Think about raising your arm out to the side.

Your deltoid contributes substantially to lifting your arm.

Meanwhile, your rotator cuff helps manage the position and movement of the humeral head.

Different muscles.
Different lines of force.
Different responsibilities.
All working together to produce controlled movement.

But the Rotator Cuff Isn't Working Alone

Here's where I think we can become too focused on those four muscles.

Your shoulder has many other muscles that influence movement and stability.

These include:

- Deltoid
- Pectoralis major
- Latissimus dorsi
- Teres major
- Long head of the biceps

Some contribute directly to controlling the humerus. Others influence the shoulder complex through their effects on movement and loading.

They don't all have the same stabilizing responsibilities as the rotator cuff.

But they are still part of the muscular system responsible for managing shoulder movement and force.

​And that's an important distinction when evaluating shoulder function.

WHY SHOULDER STABILITY MATTERS FOR YOUR GOLF SWING

Your shoulders are important components of your golf swing's kinetic chain.

Think about how force moves through your body.

From the ground, through your legs, pelvis, trunk, shoulders, arms, and eventually into the golf club.

Throughout that sequence, your shoulders are required to manage acceleration, deceleration, rotation, and changing joint positions.

And sometimes they're managing all that force while you're leaving raccoon-sized divots trying to compress the heck out of your irons!

But shoulder function isn't just important during your full swing.

What About Your Short Game?

Putting and chipping demand precision.

Small movements.
Fine adjustments.
Control over the clubhead and distance.

Your shoulder muscles contribute to those movements, too.

Now imagine certain muscles aren't producing adequate force in positions required during your swing.

That limitation may influence how your shoulder handles movement and loading, potentially affecting:

- Swing sequencing
- Movement consistency
- Control and repeatability
- Ability to tolerate golf-related forces

This doesn't mean every swing problem originates in the shoulder.

But it does mean shoulder function deserves attention, particularly when pain or weakness is already affecting your golf game.

​Golf isn't just about producing force. It's about controlling it.

WHY DO ROTATOR CUFF PROBLEMS DEVELOP?

Rotator cuff problems are rarely explained by one simple factor.

From working with golfers and reviewing their medical imaging reports, there are three functional considerations I pay attention to.

1. Muscular Dysfunction
If certain shoulder muscles can
not produce adequate force, their contribution to controlling the humeral head may be limited.

That could change how the shoulder distributes forces during particular movements.

It doesn't establish that muscular weakness caused a tear.

But it raises an important question:

Are the surrounding muscles capable of producing force in the positions the shoulder needs to use?

2. Subacromial Space

The subacromial space is located beneath the acromion, a bony structure of your shoulder blade.

Several tissues, including part of the rotator cuff, occupy this region.

Changes in this space and the forces acting on those tissues may contribute to irritation in some shoulder conditions.

However, rotator cuff disorders are more complicated than simply having a space that's too narrow.

Tendon health, loading history, tissue changes, and other factors all matter.

3. Shoulder Mechanics

Your shoulder isn't a single isolated joint.

Movement requires coordination between the humerus, scapula, clavicle, and surrounding trunk.

When that coordination changes, the shoulder may manage movement and loading differently.

And for golfers, this matters because the shoulders must function as part of a larger rotational system.

Age-related tendon changes, repetitive loading, trauma, and other factors can also contribute to rotator cuff injuries.

But regardless of why the injury developed, I still want to understand something:

What can the surrounding muscles actually do?

​That's where MAT comes in.

HOW MUSCLE ACTIVATION TECHNIQUES™ EVALUATES SHOULDER FUNCTION

Let's make this practical.

Suppose a golfer walks into Golf MATchanics and tells me:  

"Scott, I've got a rotator cuff tear."

Before we begin evaluating muscular function, I want to understand two things.

First: What happened?
Was there a fall, a sudden injury, or a traumatic event?
Or did shoulder discomfort develop gradually over time?

Second: Was the injury medically diagnosed?
There's a big difference between a confirmed tear and someone assuming they have a torn rotator cuff because their shoulder hurts.

If someone experiences a traumatic injury, sudden significant weakness, or unexplained loss of function, medical evaluation is the priority.

Once it's appropriate to assess muscular function, we can start investigating how the shoulder is working.

A Practical MAT Example: The Right Supraspinatus
Imagine you've been diagnosed with a right supraspinatus tear.

Every time you raise your right arm out to the side, your shoulder hurts.

Naturally, most people focus on that injured supraspinatus tendon.

But with MAT, we're interested in looking beyond the painful area.

I want to know whether other shoulder muscles are demonstrating limitations in their ability to produce force.

We begin by evaluating shoulder range of motion, including internal rotation, external rotation, and abduction.

We compare the right shoulder with the left.

We may also compare active and passive range of motion to understand what positions the golfer can achieve independently.

What If We Discover Limited Internal Rotation?
Let's say the right shoulder demonstrates significantly less internal rotation than the left.

We then evaluate muscular force production in that position.

And we identify a positionally weak test.

Now we have two findings worth investigating:

1. Limited shoulder internal rotation.
2. Reduced force production during testing in that position.

Rather than concentrating exclusively on the injured supraspinatus, we evaluate other muscles that contribute to internal rotation.

These may include the subscapularis, pectoralis major, teres major, and latissimus dorsi.

We investigate them individually.

Testing, Stimulating, and Retesting

Using the MAT assessment process, we evaluate individual muscles for limitations in force production.

When an appropriate muscular limitation is identified, we may apply a targeted manual technique called Digital Force Application to Muscle Attachment Tissue (DFAMAT).

This involves specific palpation and manual stimulation intended to influence muscular contraction.

Then we retest.

Has force production improved?
Does the muscle demonstrate a stronger response?

We continue evaluating the shoulder muscle by muscle, guided by the testing results.

Test. Stimulate. Retest.

Once we've addressed the identified limitations, we reassess the shoulder.

Has internal rotation improved?
Are the right and left sides becoming more similar?
Can those muscles produce greater force?

Sometimes, improving one area reveals additional limitations elsewhere.

Perhaps external rotation or abduction becomes the next priority 

This is why we continue evaluating the shoulder as a system rather than treating one isolated finding as the entire problem.

Where Isometric Strength Fits In

Before the golfer leaves, we may prescribe specific isometric exercises.

These exercises allow us to develop muscular force production in selected joint positions without requiring movement through a large range of motion.

The positions and effort levels depend on the individual's capabilities, symptoms, and medical restrictions.

The goal is to develop muscular strength where limitations have been identified.

Not simply to chase more range of motion.

But to improve the muscular capacity to actively control the positions the golfer can achieve.

Does This Repair the Torn Tendon?

No.

MAT does not mechanically repair a torn supraspinatus tendon.

Improving muscular force production may help the shoulder manage movement and loading, but it does not establish that a torn tendon is healing or that stress on the injured tissue has been reduced.

A tear still requires appropriate medical management, and some injuries may need specialized rehabilitation or surgical consultation.

MAT can be considered as a complementary approach to assessing and developing muscular function when appropriate and coordinated with the golfer's rehabilitation plan.

And that's the bigger picture.

We're not simply focused on the injured tendon.

We're evaluating the muscular capacity of the entire shoulder.

Because the goal isn't just to move your shoulder.

​It's to have the muscular strength and control to manage that movement.

THREE TAKEAWAYS EVERY GOLFER SHOULD UNDERSTAND

1. Your rotator cuff does more than rotate your arm.
Those four muscles play a major role in controlling and stabilizing the shoulder.

2. Shoulder stability extends beyond the rotator cuff.
Other muscles contribute to how your shoulder moves, controls joint position, and manages force.

3. Look beyond the diagnosis.
Knowing what's injured is essential. Understanding what the surrounding muscles can actually do helps identify additional functional limitations worth addressing.