JEFFREY PENG MD
SPORTS MEDICINE & FAMILY MEDICINE
ROTATOR CUFF TENDINOPATHY
TREATMENT IN SAN JOSE, CA
Rotator cuff tendinopathy is one of the most common causes of shoulder pain, affecting millions of adults — particularly those over 40 and individuals who perform repetitive overhead activities. Whether you've been diagnosed with rotator cuff tendinitis, tendinosis, a partial-thickness tear, or calcific tendinopathy, these conditions share a common thread: chronic tendon degeneration that causes pain, weakness, and limited motion.
Important context: A landmark study in JAMA Internal Medicine (PMID: 41697693) scanned 602 random adults with high-strength MRI and found that 99% had at least one rotator cuff abnormality — including 62% with partial-thickness tears. Most of these people had zero pain. This means your MRI report alone doesn't tell the full story. What matters is matching the right treatment to your specific symptoms and functional limitations — not just reacting to imaging findings.
Dr. Jeffrey Peng is a board-certified sports medicine physician in Campbell, CA specializing in non-surgical, evidence-based treatment for rotator cuff injuries — including PRP injections, percutaneous needle tenotomy, shockwave therapy, and targeted rehabilitation. His goal is to help you avoid surgery whenever possible while restoring full function of your shoulder.
What Is Rotator Cuff Tendinopathy?
The rotator cuff is a group of four muscles and their tendons that surround the shoulder joint, providing stability and enabling the wide range of motion your shoulder relies on for everyday activities. Rotator cuff tendinopathy refers to a spectrum of chronic tendon injury — from early-stage tendinitis (acute inflammation) to tendinosis (structural degeneration with disorganized collagen) to partial-thickness tears.
Understanding the difference between tendinitis and tendinosis is critical, because it changes everything about how your shoulder should be treated. When you first injure a tendon, your body mounts an inflammatory response — blood rushes in, growth factors arrive, and the tendon starts to repair. That's tendinitis. For many people, rest, ice, physical therapy, and anti-inflammatories can resolve it.
But when a tendon is repeatedly overloaded or the initial injury never fully heals, it shifts from an acute inflammatory state into a chronic degenerative one — tendinosis. In tendinosis, normal parallel collagen fibers are replaced by dense scar tissue and disorganized collagen. Blood flow decreases. Growth factors that drive healing are absent. The tendon becomes biologically "stuck" in a state where it cannot repair itself, regardless of how much rest or physical therapy you give it.
This is the critical distinction most people miss. If you have tendinosis, anti-inflammatory treatments like cortisone and NSAIDs aren't just ineffective — they can be counterproductive. You're suppressing an inflammatory response that's already gone. What you actually need is to restart the healing process from scratch — and that's exactly what treatments like PRP injections and percutaneous needle tenotomy are designed to do.
Your MRI Might Not Mean What You Think
A study published in JAMA Internal Medicine (PMID: 41697693) scanned 602 random adults — not patients, just regular people ages 41 to 76 — with high-strength 3-Tesla MRI. The results were staggering: 99% had at least one rotator cuff abnormality. Only 7 people out of 602 had a completely normal rotator cuff. Sixty-two percent had partial-thickness tears. Eleven percent had full-thickness tears. And the most commonly affected tendon was the supraspinatus — 98% of participants had an abnormality in that tendon alone.
Here's what makes this clinically important: rotator cuff abnormalities were found in 96% of pain-free shoulders and 98% of painful shoulders. The difference was just 2%. Tendinopathy — same in both groups. Partial tears — same in both groups. Even full-thickness tears were painless 78% of the time. The researchers argue that much of what we see on MRI is simply a normal part of aging — like gray hair for your shoulder — not necessarily something that needs surgical "fixing."
This is why Dr. Peng focuses on treating symptoms and function — not MRI reports. If your shoulder pain came on gradually and not from a traumatic injury, an MRI finding alone shouldn't dictate your treatment plan.
Symptoms of Rotator Cuff Tendinopathy
The hallmark symptom is shoulder pain — often a deep ache on the outer or front aspect of the shoulder that worsens with overhead reaching, lifting, or sleeping on the affected side. Night pain is particularly common and can be one of the most disruptive symptoms, frequently waking patients from sleep.
You may also notice weakness when lifting or rotating your arm, pain when reaching behind your back (such as fastening a bra or tucking in a shirt), a catching or clicking sensation during movement, stiffness after periods of inactivity, and progressive loss of shoulder motion. In partial tears, pain may be intermittent — flaring with certain activities and then subsiding, only to return worse than before.
Dr. Peng uses diagnostic musculoskeletal ultrasound in the clinic to visualize the rotator cuff in real time — identifying tendinosis, partial tears, calcifications, and bursitis without the need for an MRI referral. This allows for immediate diagnosis and a same-day treatment plan.
Non-Surgical Treatment Options for
Rotator Cuff Tendinopathy
Dr. Peng takes a multimodal approach to treating rotator cuff tendinopathy, tailoring the treatment plan to the stage and severity of the injury. The goal is to reduce pain, restore function, and promote actual tendon healing — not just mask symptoms.
Physical Therapy & Targeted Rehabilitation
Rehabilitation is the foundation of rotator cuff treatment. A structured program focusing on progressive strengthening of the rotator cuff muscles and scapular stabilizers is the first-line treatment supported by every major clinical practice guideline. The emphasis is on eccentric loading — slowly lowering a weight under control — which has been shown to stimulate collagen remodeling in degenerative tendons. Dr. Peng prescribes specific, progressive rehabilitation protocols rather than generic "stretch and strengthen" programs.
Shockwave Therapy
Extracorporeal shockwave therapy (ESWT) uses acoustic energy pulses to stimulate healing in chronically damaged tendons. It promotes neovascularization (new blood vessel formation), collagen synthesis, and pain relief. Shockwave is particularly effective for calcific rotator cuff tendinopathy, where calcium deposits within the tendon cause severe pain. Multiple systematic reviews support its use for tendinopathies that have failed conservative treatment.
PRP Injections for Rotator Cuff Tendinopathy
Platelet-rich plasma (PRP) is an advanced regenerative treatment that uses concentrated growth factors from your own blood to promote tendon healing. For rotator cuff tendinopathy and partial-thickness tears, PRP addresses the underlying problem — not just the pain.
The evidence for PRP in rotator cuff conditions is growing. Multiple systematic reviews and meta-analyses published in 2024-2025 evaluating PRP for rotator cuff tendinopathy have found that PRP significantly reduces pain and improves function compared to placebo and corticosteroid injections. A 2025 meta-analysis (PMID: 40200209) comparing PRP to cortisone across 27 RCTs and 1,779 patients found that PRP provided better pain scores at 3 months for rotator cuff injuries, with superior functional outcomes at 12 and 24 weeks — meaning PRP not only works faster but lasts longer.
For partial-thickness rotator cuff tears, the evidence is even more compelling when PRP is combined with tenotomy. In a randomized controlled trial (PMID: 37509489), patients who received PRP after percutaneous tenotomy had dramatically higher healing rates — nearly 80% showed complete tendon healing on ultrasound at six months, compared to just 21% in the tenotomy-only group. That's nearly a four-fold increase in actual tissue repair, without surgery.
PRP works by delivering a concentrated dose of your own platelets and growth factors — including PDGF, TGF-beta, VEGF, and EGF — directly into the damaged tendon under ultrasound guidance. These growth factors stimulate collagen production, reduce inflammation, and promote tissue remodeling. Every PRP injection performed by Dr. Peng is administered under real-time ultrasound guidance to ensure precise delivery into the targeted tissue.
PRP injections are not currently covered by insurance. However, they are considerably more affordable than surgery and offer a non-surgical path to actual tendon healing — not just temporary pain relief.
Percutaneous Needle Tenotomy for
Rotator Cuff Tendinopathy
If you've done the physical therapy, tried the exercises, maybe even gotten a cortisone shot — and your rotator cuff still isn't healing — percutaneous needle tenotomy offers a powerful middle ground between "just living with it" and going straight to surgery.
Percutaneous needle tenotomy — also called tendon fenestration, tendon needling, or by brand names like Tenex, TenJet, or TendoNova — is a minimally invasive, FDA-cleared procedure performed entirely in the clinic under local anesthesia. Using real-time ultrasound guidance, a specialized powered device is inserted directly into the damaged area of the tendon. The device mechanically fragments and removes the degenerated scar tissue, disorganized collagen, and calcific deposits that are preventing healing.
This controlled mechanical disruption does three critical things. First, it physically clears out the dead tissue — like clearing dead wood so healthy tissue can regrow. Second, it creates localized micro-injuries that trigger fresh bleeding and a controlled inflammatory cascade, sending oxygenated blood, platelets, and growth factors into an area that was previously blood-deprived. You're essentially tricking the body into treating a months- or years-old injury as a brand-new one. Third, that inflammatory response stimulates fibroblast activity and the production of new, organized collagen fibers. Over the following weeks and months, the tendon remodels and strengthens.
The research is compelling. A meta-analysis (PMID: 37148349) pooling data from 35 studies and over 1,600 patients found that ultrasound-guided tenotomy led to significant and lasting pain reduction. On a standard 10-point pain scale, patients experienced an average pain reduction of 2.5 points in the short term, 2.2 points in the mid-term, and 3.6 points in the long term — meaning the benefits didn't just hold up, they continued to improve. A separate prospective study (PMID: 33727517) of 103 patients across multiple tendon locations found the average pain score dropped from 7.3 to 1.5 out of 10 by one year — nearly an 80% reduction in pain.
The entire procedure takes about 10 to 15 minutes. No incisions, no stitches, no operating room, no general anesthesia. Most patients walk out the same day.
Tenotomy Combined with PRP — The Best of Both
Dr. Peng's preferred approach for stubborn rotator cuff tendinopathy is to combine tenotomy with PRP. The logic is straightforward: tenotomy clears out the damaged tissue and creates an acute wound environment; PRP then delivers a concentrated dose of your own growth factors — including PDGF, TGF-beta, VEGF, and EGF — directly into that freshly cleared space, amplifying the body's healing response.
The evidence supports this approach. In a randomized, double-blind, controlled trial (PMID: 37509489) studying partial supraspinatus tendon tears, patients who received PRP after tenotomy had dramatically higher healing rates — nearly 80% showed complete tendon healing on ultrasound at six months, compared to just 21% in the tenotomy-only group. That's nearly a four-fold increase in actual tissue repair, without surgery. Patients in the PRP group also had significantly greater pain reduction and shoulder function scores, with the effect size categorized as "large" — meaning the change wasn't just noticeable, it was transformative.
What Does Recovery Look Like?
The first few days are about rest and light movement. You might use a sling briefly for comfort, but most people return to desk work in a day or two. Avoid NSAIDs and ice during recovery — the success of tenotomy depends on the body's inflammatory response, and anti-inflammatories suppress it.
Acetaminophen and heat are fine for discomfort. By week one, you'll start gentle mobility exercises. Weeks 2 to 6 focus on progressive strengthening and restoring movement. By six to eight weeks, most people are ready to resume full activity — compare that to rotator cuff surgery, which often involves a recovery timeline of 6 months to a year.
Insurance note: Most insurance plans, including Medicare, PPOs, and HMOs, cover the ultrasound-guided tenotomy portion of the procedure. PRP is currently self-pay. However, tenotomy alone has strong standalone evidence — a meta-analysis (PMID: 37148349) showed consistent improvements in both pain and function.
Calcific Rotator Cuff Tendinopathy — Barbotage
Calcific tendinopathy occurs when calcium crystals build up inside the rotator cuff tendon, causing intense pain that can make lifting your arm or even sleeping nearly impossible. It is one of the most painful shoulder conditions and is often misdiagnosed or undertreated.
Barbotage is a specialized form of ultrasound-guided needle procedure designed specifically for calcific tendinopathy. During the procedure, a needle is inserted directly into the calcium deposit under ultrasound guidance. Saline is then injected and aspirated repeatedly to fragment, dissolve, and wash out the calcium. For larger or harder deposits, the needle is used to mechanically break apart the calcification.
The results are striking. Follow-up imaging often shows near-complete resolution of the calcium deposits, and patients typically experience significant pain relief within weeks. A network meta-analysis of 19 randomized trials with over 1,100 patients (PMID: 41002287) found that PRP combined with barbotage ranked highest in improving shoulder function and among the best for long-term pain relief — outperforming corticosteroid injections, shockwave therapy, and barbotage alone.
Like standard tenotomy, barbotage is performed entirely in the clinic under local anesthesia, takes less than 20 minutes, and is typically covered by insurance. It is an excellent minimally invasive alternative to arthroscopic surgery for removing calcium deposits.
Do I Need Rotator Cuff Surgery?
Rotator cuff surgery — typically arthroscopic repair — is a well-established procedure for full-thickness tears, and outcomes can be excellent in the right patient. However, surgery is not always necessary, and many patients with partial tears and tendinopathy can achieve full recovery without an operation.
Over 400,000 rotator cuff repairs are performed annually in the United States, each costing over $50,000. Despite advances in surgical technique, retear rates remain high — ranging from 10% to 40% depending on the size of the tear and patient factors. This is one of the key reasons regenerative approaches like PRP are being studied as adjuncts to both surgical and non-surgical management.
When surgery makes sense: Full-thickness tears in active patients, acute traumatic tears (especially in younger individuals), and cases where significant weakness is impacting daily function or work — particularly if non-surgical treatment has been given an adequate trial.
When non-surgical treatment may be the better path: Partial-thickness tears, chronic tendinopathy without significant structural failure, patients who want to avoid the 4-6 month surgical recovery, and older patients whose tears are primarily degenerative rather than traumatic. Many partial tears and tendinopathies respond exceptionally well to PRP, tenotomy, shockwave, and progressive rehabilitation — often achieving outcomes comparable to surgery with faster recovery and lower risk.
Dr. Peng helps patients evaluate all options based on their specific tear type, activity level, and goals. If surgery is ultimately the right choice, he works closely with trusted orthopedic surgeons in the San Jose area to ensure a seamless referral and post-surgical rehabilitation plan.
Watch: Rotator Cuff Treatment Video
Dr. Peng breaks down what rotator cuff tendinopathy is and how to treat it, including a targeted exercise and rehabilitation program.
Frequently Asked Questions
Frequently asked questions
Why Choose Dr. Jeffrey Peng for Rotator Cuff Treatment in San Jose?
Dr. Jeffrey Peng is a board-certified sports medicine and family medicine physician specializing in non-surgical treatments for sports injuries and orthopedic conditions. He completed his residency with the Stanford Family Medicine Residency Program and his sports medicine fellowship with the Stanford Primary Care Sports Medicine Fellowship in San Jose.
Dr. Peng has co-authored peer-reviewed research on platelet rich plasma with leading orthobiologics researchers and clinicians — no other PRP provider in the San Jose, Los Gatos, and Campbell area combines published research credentials with this level of clinical experience. He is an active faculty member training the next generation of sports medicine physicians and runs a popular YouTube channel with over 400,000 subscribers, making complex PRP research accessible to patients worldwide.
Every PRP injection is performed under real-time ultrasound guidance to ensure accurate placement into the targeted tissue. Studies show that ultrasound-guided injections are significantly more accurate than blind injections, which directly impacts treatment effectiveness.