Doing PT but Not Getting Better? Why Tendons Plateau and What to Reassess

The story below is a composite of real experiences; details changed.

The exercises got easy. The shoulder didn’t.

That’s the moment a lot of people quietly give up on physical therapy, right when the plan needs to change.

Luis Ortega, 39, runs a general contracting company and is ten weeks into PT for his right shoulder. He hasn’t missed a session. He does the band work every night on the garage floor while his kids brush their teeth.

It’s the same green band he got in week two.

He still can’t press a sheet of drywall overhead without that sharp catch. “I’m doing everything they told me,” he says. “Why am I still stuck?”

It’s the right question. It deserves a better answer than “give it time.”

Why tendons are slow learners

Muscle responds to training in weeks. Tendons take longer, and there are real reasons why.

Less blood supply. As we age, blood supply to the rotator cuff tendons decreases. (AAOS OrthoInfo) Less blood flow means slower repair.

Slow rebuilding. After loading, a tendon ramps up collagen production for about three days. But breakdown rises first. For the first day or so, the tendon runs at a net loss. The gain comes after. (Magnusson et al., Nature Reviews Rheumatology, 2010)

A very old core. Researchers used carbon-14 left over from Cold War nuclear tests to date human Achilles tendons. The core tissue barely renews, if at all, once we stop growing. (Heinemeier et al., 2013) That study was on the Achilles, not the shoulder. But it shows how slowly tendon tissue changes.

So tendons do adapt. They just need the right load, enough recovery between sessions, and more time than muscle does.

The Achilles is the extreme case. Here’s why the Achilles tendon is a different problem.

What the PT research actually studies

It helps to know what “PT works” means in the papers.

Most studies measure symptoms and function scores. They rarely measure whether a tendon structurally healed.

The MOON study followed 452 people with painful full-thickness rotator cuff tears who started with 6 to 12 weeks of PT. After ten years, roughly one in four had chosen surgery. The rest kept their improvement on patient-reported scores. (MOON Shoulder Group, 2024)

The catch: “success” meant not having surgery. It doesn’t prove the tendons healed.

A large UK trial called GRASP split 708 people with rotator cuff problems into groups. Over a year, up to six sessions of progressive exercise did no better on average than one session of best-practice advice plus a home program. (Hopewell et al., The Lancet, 2021)

That doesn’t mean PT is useless. It means the home work, and whether the load progresses, may matter more than how many visits you log. GRASP also excluded people who needed surgery, so it can’t speak to every shoulder.

The six-point PT check

Before your next session, run through this. Be honest. Nobody’s grading you.

Number five trips up a lot of people. If your job and your rehab are hitting the same shoulder, read why your job and your workouts are loading the same injury.

Rehabbing after a hip scope? Read why hip flexor pain shows up after hip arthroscopy.

How to ask for a real reassessment

Don’t just say “it’s not getting better.” Bring specifics.

Before-and-after tasks work best. Pick two or three things you can test the same way each week:

• How many overhead reaches before the catch?
• Can you sleep on that side? For how long?
• What weight can you press or carry without pain?

Then ask three questions:

1. “What’s the next change to the plan, and why?”
2. “What result should I see, and by when?”
3. “If I don’t see it, what’s the next step? Imaging, a specialist or a different approach?”

A good plan has a date and a decision attached. “Keep doing what you’re doing” doesn’t count.

If you already have imaging, learn how to read your MRI report like a contract before the next visit.

The heavier band

At week eleven, Luis brings a page to therapy. Same band since week two. Overhead: 6 reaches before the catch. Sleep on right side: no.

His therapist reads it and nods. They change the plan that day: heavier resistance, a new overhead progression and a check-in date three weeks out.

It isn’t a miracle. It’s a plan that moves again.

You did the work. Now make sure the work is still doing something. Tonight, write down what you actually did last week. Bring it to your next session.

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Luis is a composite, drawn from the kinds of stories people describe during rehab. The details are illustrative. The pattern is real.