Rotator Cuff Tear: Do You Need Surgery, or Can the Shoulder Get Strong Again? — Muscle IQ in Orem

Your scan says "rotator cuff tear." Now you can't lift your arm to comb your hair, reach a high shelf, or sleep on your side. The natural conclusion is that the tear is why the shoulder is weak, and that surgery is the only way to fix it.

The research tells a more interesting story. In many people, the tear is only part of the picture.

A weak shoulder is not always a torn shoulder

Strength is not just a matter of muscle and tendon. Your nervous system sets how hard each muscle is allowed to work. Pain and irritated tissue can turn that setting down, a bit like lowering a dial. We call it muscle inhibition, and it can leave a muscle weak even when the muscle itself is intact. You can read more on our muscle inhibition page.

Several studies point in this direction. In one large study of women aged 64 to 84 from the general population, researchers used ultrasound to sort shoulders by tear size and measured lifting strength. Tears did not, on their own, explain lower strength, and women under 70 kept their strength regardless of tear size. Pain, however, independently reduced strength by roughly 11 percent, whatever the tendon looked like. Strength loss tied to a tear showed up mainly in the over-70 group.

Another study, of patients scheduled for shoulder surgery, found marked weakness in every group, including patients who turned out to have no tear at all. That fits a pain-driven turn-down of the muscles rather than a torn tendon alone.

What happened when the pain signal was quieted

One older study, summarized in our Journal of Muscle IQ, Volume 10, is hard to ignore. Fourteen patients with shoulder pain from pinching under the top of the shoulder blade, nine of whom had tears that went all the way through the tendon, received a numbing injection in that area. Five minutes later, thirteen of the fourteen tested stronger, and average strength on a machine test rose by 48 percent.

The tears had not healed in five minutes. The strength had been held back, and it came back when the pain signal was quieted. That is a small study and a research setting, not a treatment, and it does not mean every shoulder will respond the same way. But it shows that some of a weak shoulder can be about the nervous system's settings.

What about surgery?

Surgery is the right call for some tears, and your surgeon knows your shoulder. The research is still worth knowing about.

In a 15-year trial of small-to-medium tears, patients were randomly assigned to tendon repair surgery or physical therapy. At 15 years, the surgery group had better scores on average, and the unrepaired tears had grown. Yet the strength difference between the two groups was about 1.8 kilograms (around 4 pounds), and 71 percent of the physical therapy group never needed surgery. About 29 percent did go on to have surgery, and those patients stayed in the physical therapy group for the analysis, which likely made the gap look smaller than it would otherwise be. The surgery group did gain strength over the years, while the physical therapy group's strength stayed about where it started. The unrepaired tears grew, but strength did not fall apart.

So the honest answer to "surgery or strength?" is that the size of a tear on paper does not predict how weak a shoulder will feel. Finding out what is holding your shoulder back is a reasonable first step, and it helps you have a better conversation with your surgeon.

How Muscle IQ in Orem approaches a torn shoulder

An MRI shows a surgeon where a tear is. Muscle testing shows a physical therapist where to treat. At Muscle IQ, we test the muscles of the shoulder, neck, and upper back, and we look for the ones that are turned down and the tissues that are irritated and stiff. We treat, then retest, so you and your therapist can see in real numbers whether anything changed.

Our shoulder pain page explains the approach in more detail. Everyone's shoulder is different, and some people do need repair. If you have sudden weakness after an injury, a shoulder that will not lift at all, or severe night pain, see your physician promptly.

If you live in Orem, Provo, Lindon, Vineyard, or elsewhere in Utah County and a torn rotator cuff has you weighing surgery, our Orem clinic can test what is holding your shoulder back, so you can talk with your surgeon with more information.

Take control of your health today by calling Muscle IQ at (801) 310-0851 to schedule your first appointment.

Learn more at MuscleIQ.com.

Research referenced: Hinsley et al., BMJ Open 2023; McCabe et al., J Orthop Sports Phys Ther 2005; Moosmayer et al., J Bone Joint Surg 2024; Ben-Yishay et al., 1994 (via Journal of Muscle IQ Vol. 10).