Proximal Hamstring Tendinopathy and Partial Tears: PRP, Stem Cells and the Rehab That Matters

Proximal hamstring tendinopathy is the deep, nagging buttock pain that shows up when you sit on a hard chair, drive for an hour, or try to run uphill. It sits right at the sit bone (the ischial tuberosity), where the hamstring tendons attach to the pelvis. It is stubborn, it is common in runners and people over 40, and it is one of the conditions where regenerative injections get mentioned a lot.

The short answer: for tendinopathy and partial tears at the top of the hamstring, platelet-rich plasma (PRP) has more research behind it than cell-based injections, and even the PRP evidence is mixed. Cell-based treatment here is experimental. And whatever injection you choose, a structured loading rehab program does most of the heavy lifting. This guide explains why, and how to make a sensible decision about treatment in Colombia.

Tendinopathy, partial tear, full avulsion: why the label matters

"Hamstring injury" covers several very different problems, and the right path depends on which one you have.

What the evidence says about PRP

PRP is made by spinning your own blood to concentrate platelets, which carry growth factors, then injecting it at the tendon. For proximal hamstring tendinopathy, several studies have reported pain improvement after PRP. But the trials are small, the PRP preparations differ from study to study, and comparisons against good rehab or other injections have not given a clean, consistent answer.

In practice, that means PRP is a reasonable thing to discuss with a sports medicine physician when rehab alone has stalled, but it is not a proven fix. It also means you should ask any clinic exactly what kind of PRP they use, because "PRP" is not one standard product. Our PRP vs stem cell comparison explains the differences.

What the evidence says about cell-based injections

Cell-based injections for proximal hamstring problems have very limited published research. Much of what exists for tendons in general comes from other sites, such as the Achilles, elbow or rotator cuff, or from animal work. That evidence is interesting, but it does not tell you how a hamstring attachment will respond.

• What it suggests: mesenchymal stromal cells may influence inflammation and healing signals, mostly through what they secrete rather than by becoming new tendon. See do injected stem cells survive.
• What it doesn't show: there is no strong comparative data showing cell-based injections beat PRP or rehab for the proximal hamstring. There is no settled dose or cell source.
• Cost reality: cell-based treatments generally cost more than PRP. With weaker evidence, that is worth weighing honestly.

Rehab is the treatment, not the add-on

For tendinopathy, the most consistent finding across tendon research is that progressive, well-dosed loading helps tendons adapt. Whatever injection you choose, it is meant to support that process, not replace it. A clinic that injects you and sends you home without a rehab plan is skipping the part most likely to help.

A sports physical therapist will usually build a program around a few principles. We are not prescribing exercises or sets here, because the right plan depends on your irritability, strength and goals. Ask your PT to walk you through these ideas.

• Calm things down first. Reduce compressive positions that irritate the tendon, such as deep hip flexion, long sitting on hard surfaces, and stretching the hamstring hard.
• Load progressively. Start with exercises the tendon tolerates and build gradually over weeks and months.
• Train the whole chain. Glutes, trunk and the rest of the hip usually get attention, not just the hamstring.
• Return to running and sport in stages. Hill running and speed work tend to come back last.
• Track symptoms. Many PTs use a pain-monitoring approach so you know how much is too much.

Tendon rehab takes patience. Improvement is often measured in months. That timeline applies after an injection too, which is why a two-week trip to Colombia needs a plan for the rest of your recovery at home. See how long until stem cell therapy works.

Before an injection: imaging and workup

Pain near the sit bone is not always hamstring tendinopathy. Sciatic nerve irritation, referred pain from the low back, hip joint problems and other deep gluteal issues can look similar. Before anyone injects anything, the diagnosis should be confirmed.

• MRI of the pelvis or hip focused on the hamstring origin, read by a musculoskeletal radiologist when possible. It shows tendon thickening, partial tears and whether the attachment is intact.
• Ultrasound may be used for diagnosis and is also how injections at the hamstring origin are typically guided.
• Exam for nerve involvement. The sciatic nerve runs close by. If you have tingling or burning down the leg, raise it.
• Your rehab history. What you did, for how long, and with whom. Clinics should know whether you have had a proper trial of loading.

Read more about what we expect clinics to request in imaging requirements before treatment, and why guidance matters in imaging-guided injections as the standard.

What treatment in Colombia might look like

1. Remote review. Send MRI images and the report, plus a short history, before you book flights. A physician should tell you whether an injection is even worth discussing.
2. In-person exam. The doctor confirms the diagnosis and your candidacy. Ask what they would recommend if money were not a factor.
3. Ultrasound-guided injection. The hamstring origin sits deep under the gluteal muscles and near the sciatic nerve. Blind injection here is not appropriate.
4. Short protective phase. Most protocols limit heavy loading and running for a period. Get yours in writing, including what you can do on the flight home.
5. Handoff to rehab. Bring the clinic's written protocol to your PT at home, and schedule that first PT visit before you leave.

Risks to weigh

• Post-injection pain and flare are common for a few days; some people feel worse before they feel better.
• Infection is uncommon but possible with any injection.
• The sciatic nerve is nearby, which is one reason imaging guidance matters.
• For donor-derived cell products, product quality and testing documentation matter. Read what a certificate of analysis should show.
• Spending money and travel time on an option with limited evidence is itself a cost.

There is also an opportunity cost worth naming. If the real problem is that you never had a properly progressed rehab program, an injection can become a distraction from the thing most likely to help. Before you book, ask yourself honestly whether you have given loading a full, supervised trial. If not, a few months with a good sports physical therapist at home may be the smarter first investment, and the trip can wait.

Questions to ask before you book

• Does my MRI show tendinopathy, a partial tear, or something else?
• Have I had an adequate trial of rehab, in your opinion?
• Why PRP, cells, or neither for me specifically?
• What type of PRP or cell product do you use, and what documentation comes with it?
• Will the injection be ultrasound-guided, and who performs it?
• What is the written loading plan for the first weeks after injection?
• How will you follow up once I am home?

If you'd like help understanding your MRI and deciding whether a trip makes sense, send us your history and we'll help you think it through before you spend anything.

Frequently asked questions

Is PRP or stem cell therapy better for hamstring tendinopathy?

There is no strong head-to-head evidence. PRP has been studied more for this condition, while cell-based injections have very little hamstring-specific research. Either way, the injection should be paired with a structured rehab program.

How long does hamstring tendinopathy take to improve after an injection?

Tendons adapt slowly, so improvement, when it happens, usually unfolds over weeks to months alongside rehab. Your physician and PT should give you a staged plan rather than a fixed date.

Can a partial hamstring tear heal without surgery?

Many partial tears are managed without surgery, but some are not, depending on how much of the tendon is involved and your activity goals. An orthopedic or sports medicine physician who has seen your MRI is the right person to advise you.

Can I fly home right after a hamstring injection?

Ask your treating physician. Long periods of sitting often irritate this tendon, so plan for an aisle seat, frequent standing and a cushion, and follow any clot-prevention advice you are given.

Should I stretch my hamstring if I have proximal tendinopathy?

Many physical therapists advise avoiding aggressive hamstring stretching early on because it compresses the tendon at the sit bone. Get specific guidance from your PT.