PRP vs Stem Cells for Shoulder Pain: What’s the Difference?

Quick Answer: PRP vs Stem Cells for Shoulder Pain

PRP has been studied more extensively than cell-based therapy for common shoulder problems such as rotator cuff tendinopathy and partial-thickness tears.

However, even the PRP evidence is mixed.

The American Academy of Orthopaedic Surgeons’ 2025 rotator cuff guideline states that routine PRP injection is not supported for rotator cuff tendinopathy or partial-thickness tears, largely because studies have produced inconsistent results. (AAOS)

Human research involving cell-based treatment for the shoulder is less extensive and involves very different products, including:

Bone marrow concentrate
Adipose-derived regenerative cells
Culture-expanded MSCs
Cell-based augmentation performed during surgery

Some studies have reported promising results, but those findings cannot automatically be applied to every stem-cell product or every shoulder injury. (PubMed)

So:

PRP has more clinical shoulder research.

Cell-based therapy has emerging research but greater variability between products.

Neither should be assumed to repair every shoulder injury.

What Is PRP?

PRP stands for:

platelet-rich plasma.

A patient’s blood is drawn and processed to concentrate platelets within the plasma.

Platelets contain signaling molecules and growth factors involved in normal tissue responses to injury.

PRP is then injected into the area being treated.

Because the material comes from the patient’s own blood, PRP is:

autologous.

That means donor and recipient are the same person.

What Is Stem Cell Therapy?

“Stem cell therapy” is a much broader category.

Products discussed in orthopedic research have included:

Bone-marrow-derived MSCs
Bone marrow concentrate
Adipose-derived cells
Umbilical cord-derived MSCs
Other cell and tissue products

That makes comparison difficult.

A study involving adipose-derived cells cannot automatically prove that an umbilical-cord-derived product will behave the same way.

Likewise, a study involving bone marrow concentrate combined with platelet products does not establish the effectiveness of every cell-based injection.

This is why the exact product matters.

Which Has More Research for Shoulder Pain?

For common rotator cuff conditions, PRP currently has the larger clinical literature.

AAOS reviewed multiple studies involving PRP for rotator cuff tendinopathy and partial-thickness tears when creating its updated 2025 guideline.

Some trials reported better pain, range of motion, or patient-reported outcomes with PRP.

Others found PRP performed similarly to treatments such as corticosteroid injections, hyaluronic acid, or other comparators.

Because of that inconsistency, AAOS does not currently support the routine use of PRP for rotator cuff tendinopathy or partial tears. (AAOS)

“Routine use is not supported” does not mean:

PRP never helps anyone.

It means the current evidence is not consistent enough to recommend it broadly for every patient with these conditions.

What Does the Stem Cell Research Show?

There are fewer high-quality human trials involving cell-based treatment for shoulder injuries.

And the products studied are highly variable.

Adipose-Derived Cells for Partial Rotator Cuff Tears

A small randomized pilot study compared an injection of fresh autologous adipose-derived regenerative cells with corticosteroid treatment in patients with symptomatic partial-thickness rotator cuff tears.

The modified analysis included only 16 patients, so this was a small study designed to provide early evidence rather than a definitive answer. (PubMed)

Bone Marrow Concentrate Plus Platelet Products

A randomized trial compared a combination of bone marrow concentrate and platelet products with exercise therapy for rotator cuff tears.

At two-year follow-up, the treatment group reported greater improvements in several pain and functional outcomes. (PubMed)

But there is a major limitation when comparing this study with either PRP alone or another stem-cell product:

The treatment combined bone marrow concentrate with platelet products.

So it does not tell us whether the outcome came from:

The bone marrow component
The platelet component
Their combination
Another aspect of the treatment protocol

What About Stem Cells During Rotator Cuff Surgery?

This is another completely different area of research.

Some studies investigate biologic augmentation during surgical rotator cuff repair.

For example, researchers have evaluated microfragmented adipose tissue and techniques designed to recruit endogenous bone-marrow cells to the surgical repair site. (PubMed)

Those studies should not be interpreted as proof that:

a stem-cell injection can replace rotator cuff surgery.

A therapy used to support tissue after the tendon has already been surgically reattached is fundamentally different from an injection used instead of surgery.

PRP vs Stem Cells for a Partial Rotator Cuff Tear

This is probably the most common scenario where someone might compare the two.

For a partial tear, treatment depends on factors such as:

Tear depth
Pain
Weakness
Duration
Activity level
Previous physical therapy
Age
Other shoulder pathology

Physical therapy remains an important treatment option.

AAOS states that physical therapy can improve outcomes in patients with low- or intermediate-grade partial-thickness tears. For persistent high-grade tears that fail conservative management, surgery may be considered. (Guideline Central)

PRP may also be discussed, but the evidence is mixed.

Cell-based treatment has less clinical evidence and greater product variability.

PRP vs Stem Cells for a Full-Thickness Rotator Cuff Tear

A full-thickness tear creates a different problem.

The tendon is completely torn through its thickness.

For symptomatic small-to-medium full-thickness tears, AAOS reports that both physical therapy and surgical treatment can improve patient-reported outcomes. The guideline also notes that tear size, muscle atrophy, and fatty infiltration may progress over time during nonsurgical management. (Guideline Central)

PRP is not routinely recommended as a nonsurgical treatment for full-thickness tears based on current evidence. (Guideline Central)

Cell-based injections also should not be assumed to mechanically reconnect a completely disrupted tendon.

If significant weakness or loss of function is present, an orthopedic evaluation may be particularly important.

What About Shoulder Labral Tears?

This is another reason diagnosis matters.

A labral tear is not a rotator cuff tear.

The shoulder labrum helps stabilize the joint, and significant labral injuries may cause:

Catching
Clicking
Pain
Recurrent instability
Dislocations

There is currently very limited direct human evidence supporting either PRP or stem-cell injections specifically for shoulder labral tears.

A patient with recurrent instability or repeated dislocation may have a mechanical structural problem that an injection cannot reliably correct.

Is PRP Safer Because It Comes From Your Own Blood?

PRP avoids exposure to donor tissue because it is prepared from the patient’s own blood.

That is one practical difference.

But no injection is completely risk-free.

Potential risks can include:

Pain after injection
Bleeding
Infection
Injury to surrounding structures
Failure to improve symptoms

The exact risk profile of a cell-based treatment depends partly on the product and how it is processed and administered.

Are Stem Cells Stronger Than PRP?

There is no clinically validated scale where:

PRP = weak

and

stem cells = strong.

They are biologically different treatments.

PRP delivers a concentration of platelets and platelet-associated signaling molecules.

MSC-based treatments are studied partly because cells can interact with their environment and release cytokines, growth factors, extracellular vesicles, and other signaling molecules.

More biological complexity does not automatically mean better clinical outcomes.

Can PRP and Stem Cells Be Used Together?

Some orthopedic research has combined cell-based products with platelet preparations.

The randomized rotator cuff study involving bone marrow concentrate, for example, also included platelet products. (PubMed)

That does not prove every combination is superior to either treatment alone.

Combination therapy needs its own clinical evidence.

Which One Is Better for Me?

The decision should start with the diagnosis.

Someone with:

mild rotator cuff tendinopathy

may have a completely different treatment plan than someone with:

a high-grade partial tear

or:

a complete traumatic tear

or:

shoulder arthritis

or:

a labral tear causing recurrent instability.

A regenerative consultation should evaluate:

Symptoms
Physical examination
MRI or ultrasound findings
Previous treatment
Severity
Functional limitations
Patient goals

Then the options can be compared realistically.

Frequently Asked Questions

Is PRP better than stem cells for shoulder pain?

There is no universal answer.

PRP has a larger body of shoulder-specific clinical research, but findings are inconsistent. Cell-based therapies have less shoulder-specific human evidence and involve more variable products. (AAOS)

Does PRP work for rotator cuff tears?

Some studies report improvement, while others do not find meaningful superiority over comparison treatments.

The 2025 AAOS guideline does not support routine PRP injection for rotator cuff tendinopathy or partial-thickness tears. (AAOS)

Do stem cells work for rotator cuff tears?

Early human studies involving several types of cell-based treatment have reported promising findings, but the evidence is not yet strong enough to conclude that every stem-cell product is effective for rotator cuff tears. (PubMed)

Can PRP heal a complete rotator cuff tear?

PRP should not be assumed to mechanically reconnect a completely torn tendon.

Full-thickness tears require individualized orthopedic assessment.

Can stem cells heal a complete rotator cuff tear?

There is not sufficient evidence to promise that a stem-cell injection can reattach a completely disrupted rotator cuff tendon.

Which is more natural, PRP or stem cells?

PRP is prepared from your own blood.

Cell-based treatments may be autologous or donor-derived depending on the product.

“Natural” is not a useful measure of effectiveness.

Are stem cells FDA-approved for shoulder pain?

No stem-cell regenerative medicine product is currently FDA-approved specifically for shoulder pain or other orthopedic conditions. FDA continues to identify shoulder pain among orthopedic uses for which regenerative medicine therapies have not been approved. (U.S. Food and Drug Administration)

Start With the Shoulder, Not the Injection

PRP and stem-cell treatments are easy to compare as products.

But that is usually not the most important comparison.

The real question is:

What is wrong with your shoulder?

A person with tendinopathy may need a different plan than someone with a partial tear.

A partial tear is different from a complete tear.

And shoulder pain from arthritis is different from pain caused by instability or a torn labrum.

At The Re/ Clinic in Sandy, Utah, regenerative medicine consultations are designed to evaluate the diagnosis, imaging, previous treatment, and individual goals before deciding whether a biologic approach is reasonable to discuss. The clinic currently offers regenerative medicine services for musculoskeletal concerns. (The Re/ Clinic)

Call: 385-240-1000
Location: 9035 S 700 E, Sandy, UT 84070 (The Re/ Clinic)

References

American Academy of Orthopaedic Surgeons. Management of Rotator Cuff Injuries Evidence-Based Clinical Practice Guideline. Updated August 2025. The guideline reviews PRP, rehabilitation, surgery, and other treatment options for adult rotator cuff injuries. (AAOS)
Centeno CJ, et al. Percutaneous bone marrow concentrate and platelet products versus exercise therapy for the treatment of rotator cuff tears: a randomized controlled, crossover trial with 2-year follow-up. Human randomized trial comparing bone marrow concentrate plus platelet products with exercise therapy. (PubMed)
Safety and efficacy of treating symptomatic partial-thickness rotator cuff tears with fresh autologous adipose-derived regenerative cells. Prospective randomized pilot study of adipose-derived regenerative cells compared with corticosteroid injection. (PubMed)
Intraoperative Channeling in Arthroscopic Rotator Cuff Repair: A Multicenter Randomized Controlled Trial. Evaluated a surgical technique intended to recruit endogenous marrow-derived cells and signaling factors during rotator cuff repair. (PubMed)
Arthroscopic Rotator Cuff Repair Augmentation With Autologous Microfragmented Lipoaspirate Tissue. Randomized controlled study evaluating biologic augmentation during surgical repair. (PubMed)
U.S. Food and Drug Administration. Important Patient and Consumer Information About Regenerative Medicine Therapies. FDA states that regenerative medicine products are not approved for orthopedic conditions including shoulder pain. (U.S. Food and Drug Administration)
Utah Code § 58-1-512. Current stem-cell disclosure requirements, effective May 6, 2026. (Utah Legislature)

Utah Stem Cell Therapy Notice

THIS NOTICE MUST BE PROVIDED TO YOU UNDER UTAH LAW.

This health care practitioner performs one or more stem cell therapies that have not yet been approved by the United States Food and Drug Administration.

You are encouraged to consult with your primary care provider before undergoing a stem cell therapy. (Utah Legislature).