Proximal Hamstring Tendinopathy in NYC: Sit-Bone Pain, Rehab Protocols, and When PRP Helps

If you have a deep, nagging ache right where your hamstring meets your sit bone — the kind that flares when you sit on a subway bench, drive for an hour, or start a run — you may be dealing with proximal hamstring tendinopathy. It is one of the most under-diagnosed causes of buttock pain in runners, cyclists, dancers, and desk workers, and it is notoriously slow to settle with rest alone.

This guide, written from the perspective of Dr. Ajit Dhaliwal's practice at Regen Health Physicians in New York City and Salt Lake City, explains what is actually happening inside the tendon, how to tell it apart from sciatica and piriformis syndrome, which rehabilitation approaches have the best evidence, and where ultrasound-guided PRP fits for tendons that have stopped responding.

What Is Proximal Hamstring Tendinopathy?

The three hamstring muscles — biceps femoris, semitendinosus, and semimembranosus — share a common tendon origin on the ischial tuberosity, the bony point you sit on. Proximal hamstring tendinopathy (PHT) is a degenerative, overload-driven condition of that tendon origin. It is not primarily an inflammatory "tendinitis"; biopsies of chronic tendinopathy consistently show disorganized collagen, increased ground substance, abnormal blood-vessel ingrowth, and altered tenocyte behavior, with few classic inflammatory cells.

That distinction matters, because it explains why anti-inflammatories and rest often give short-term relief but rarely fix the problem. The tendon needs to be remodeled, and remodeling is driven by appropriately dosed load.

Why this tendon is vulnerable

The proximal hamstring tendon is subjected to two kinds of stress:

• Tensile load — the pull of the muscle during running, sprinting, and hip hinging.
• Compressive load — when the hip is deeply flexed (lunging, uphill running, sitting, stretching toward your toes), the tendon wraps around and is pressed against the ischial tuberosity.

Research by Goom, Malliaras, and colleagues highlighted that compression combined with tension is the key provocative combination. This is why aggressive hamstring stretching — a common first instinct — frequently makes PHT worse.

Who Gets It?

• Distance and trail runners, especially after adding hills, speed work, or mileage quickly
• Sprinters and field-sport athletes
• Cyclists with aggressive saddle positions
• Dancers, yoga practitioners, and Pilates enthusiasts who spend time in deep hip flexion
• Desk workers who sit for long periods, often combined with weekend running
• Adults over 35, as tendon collagen turnover slows
• People with metabolic risk factors — insulin resistance, elevated lipids, and certain medications (notably fluoroquinolone antibiotics) are associated with poorer tendon health

Symptoms: How It Typically Presents

• A deep, localized ache at the sit bone, sometimes radiating a few inches down the back of the thigh
• Pain when sitting, especially on hard surfaces or for long periods
• Pain during or after running, particularly uphill or at faster paces
• Stiffness that "warms up" early in a run and then returns afterward or the next morning
• Pain with lunges, deep squats, or forward bends with straight legs
• Tenderness when pressing directly on the ischial tuberosity

Unlike an acute hamstring strain, there is usually no single "pop." Onset is gradual over weeks to months.

Hamstring Tendinopathy vs. Sciatica vs. Piriformis Syndrome

Buttock pain has several look-alikes, and getting the diagnosis right is the most important step.

• Lumbar radiculopathy (sciatica): Pain often travels below the knee, may involve numbness, tingling, or weakness, and is influenced by spinal position. Straight-leg raise and slump tests reproduce nerve symptoms.
• Piriformis / deep gluteal syndrome: Pain sits more in the mid-buttock, often with sciatic-type symptoms provoked by hip rotation.
• Proximal hamstring tendinopathy: Pain is pinpoint at the sit bone, reproduced by loading tests and sitting, usually without neurological symptoms.
• Ischiofemoral impingement, ischial bursitis, or SI joint dysfunction can also overlap.

It is also possible to have more than one. Chronic PHT can irritate the nearby sciatic nerve, which lies just lateral to the tendon origin. If you have back-related symptoms, our article on SI joint and low back causes is a useful companion.

Clinical tests

A physician will typically use a cluster of provocation tests, including:

• Bent-knee stretch test and modified bent-knee stretch test
• Puranen-Orava test (standing hamstring stretch with the foot on a support)
• Single-leg bridge at increasing knee extension
• Palpation of the ischial tuberosity

No single test is definitive; the pattern is what counts.

Imaging: Ultrasound and MRI

Diagnostic ultrasound in the office lets the physician see tendon thickening, hypoechoic (darker) areas of degeneration, partial-thickness tears, calcification, and abnormal blood flow on Doppler. It is quick, dynamic, and lets us compare the painful side to the other.

MRI is valuable when a significant tear or avulsion is suspected, when the diagnosis is unclear, or when surgery is being considered. MRI studies show tendon thickening and peritendinous edema in symptomatic PHT, though imaging findings do not always match pain levels — which is why treatment is guided by symptoms and function, not pictures alone.

Stage-Based Treatment: What Actually Works

Step 1: Load management, not total rest

Complete rest de-conditions the tendon. Instead, we reduce the most provocative loads:

• Temporarily cut hill running, speed work, and long runs
• Avoid deep hip flexion under load: lunges, deep squats, and forward-fold stretches
• Stop static hamstring stretching for now
• Use a cushion or sit with hips slightly higher than knees; take standing breaks every 30–45 minutes
• Adjust bike saddle height and position

A simple guide: pain during activity up to about 3/10 that settles within 24 hours is generally acceptable. Pain that is worse the next morning means the load was too high.

Step 2: Isometric loading for pain relief

Isometric holds — for example, a prone or supine hamstring bridge hold with the knee bent, or a hamstring curl held at mid-range — can reduce pain in the short term. A common starting dose is 5 holds of 30–45 seconds, performed in a position that does not compress the tendon (limited hip flexion).

Step 3: Progressive isotonic strengthening

This is the core of rehabilitation and the treatment with the most consistent support. Over 8–12+ weeks, exercises progress from low hip flexion to higher flexion and from slow to faster loading:

• Bridges → single-leg bridges → bridges with increasing knee extension
• Hamstring curls (machine or slider)
• Romanian deadlifts in a shallow range, gradually deepening
• Hip extension on a 45° bench
• Nordic hamstring curls later in rehab
• Glute and trunk strengthening, since weak hip extensors shift load onto the hamstring

The goal is heavy, slow resistance work two to three times per week, with load increasing as tolerance improves.

Step 4: Energy-storage and return to sport

Once strength is restored, plyometrics, bounding, accelerations, and finally hill and sprint work are reintroduced. Skipping this phase is a common reason for recurrence in runners.

When Rehab Isn't Enough: Injection Options

A meaningful minority of patients — often those with symptoms lasting longer than six months, partial tears, or repeated flare-ups — plateau despite a well-executed program. That is when injection therapy is worth discussing.

Corticosteroid injections

Steroid injections can reduce pain short-term, but evidence across tendinopathies shows benefits often fade and outcomes at longer follow-up may be no better — or worse — than alternatives. Steroids can also impair collagen synthesis and weaken tendon tissue. We generally avoid them in load-bearing tendons, a pattern also seen in tennis elbow research.

Platelet-rich plasma (PRP)

PRP is a concentrate of your own platelets, which contain growth factors (PDGF, TGF-β, VEGF, IGF-1) involved in cell recruitment, collagen synthesis, and new blood supply. For proximal hamstring tendinopathy:

• Case series and cohort studies — including work by Fader and colleagues and by Davenport and colleagues — report meaningful pain and function improvements in patients who had failed conservative care.
• A randomized trial comparing PRP with whole blood found improvement in both groups, highlighting that injection technique, platelet dose, and the rehab that follows matter as much as the injectate itself.
• Overall, the evidence base is promising but not definitive; higher-quality trials are still needed.

How we perform it: Under real-time ultrasound guidance, the PRP is placed precisely into the degenerative and partially torn regions of the tendon origin while avoiding the sciatic nerve. "Blind" injections in this deep, nerve-adjacent area are not appropriate. Many tendons respond best to leukocyte-rich formulations, though choice depends on the tissue picture — see our guide to platelet-poor plasma vs PRP formulations. Learn more on our regenerative medicine for joint, back and shoulder pain page.

Percutaneous tenotomy and other options

For calcified or very thickened tendons, needle fenestration (tenotomy) can be combined with PRP to stimulate a healing response. Extracorporeal shockwave therapy (ESWT) has also shown benefit in a randomized trial by Cacchio and colleagues versus traditional conservative care, and can be combined with exercise.

What to Expect Around a PRP Procedure

Before: Stop NSAIDs and certain supplements in advance, as they can blunt platelet function — our medications and supplements to stop before PRP guide has specifics.

Day of: A blood draw, centrifuge processing, local anesthetic, and an ultrasound-guided injection, usually completed in about an hour.

First 1–2 weeks: Soreness for several days is expected — this is part of the healing response. Walking is encouraged; avoid prolonged sitting on hard surfaces, running, and heavy hamstring loading.

Weeks 2–6: Gentle isometrics, then progressive strengthening.

Weeks 6–12+: Continued strength progression and graded return to running. Tendons remodel slowly; most patients notice the clearest improvement between 6 and 12 weeks, with continued gains for months. Our week-by-week tendon healing timeline after PRP covers this in depth.

When Is Surgery Needed?

Surgery is reserved for:

• Complete avulsions of the tendon from the bone, especially with retraction (often after an acute injury rather than gradual tendinopathy)
• High-grade tears with significant weakness
• Chronic cases that fail comprehensive rehab and biologic options, sometimes with sciatic nerve entrapment

An acute injury with a pop, bruising down the back of the thigh, and difficulty walking deserves prompt imaging, because acute avulsion repair outcomes are better when done early.

Supporting Tendon Health From the Inside

Tendon healing does not occur in isolation. Factors we evaluate in our patients include:

• Metabolic health: insulin resistance and elevated blood sugar impair collagen quality
• Vitamin D and protein intake: adequate protein (including collagen/gelatin taken with vitamin C before loading, studied by Shaw and Baar) may support collagen synthesis
• Hormones: low estrogen in perimenopause and low testosterone can both affect tendon resilience
• Medication review: fluoroquinolones and repeated steroid exposure raise tendon risk
• Sleep and recovery: tendons adapt between sessions, not during them

Some patients also ask about peptides such as BPC-157 for tendon healing; the data are predominantly preclinical, and we discuss them cautiously on our peptide therapy page.

Frequently Asked Questions

Should I stretch my hamstrings?

Usually not during the painful phase. Stretching compresses the tendon against the sit bone. Strengthening is the priority.

Can I keep running?

Often yes, at reduced volume and on flat ground, provided pain stays low and settles within 24 hours.

How long does recovery take?

With consistent rehab, many people improve substantially in 3–6 months. Chronic cases may take longer, which is when PRP is typically considered.

Is PRP covered by insurance?

PRP is generally not covered by insurance. We provide transparent pricing at consultation.

Getting Evaluated in New York City or Salt Lake City

Proximal hamstring tendinopathy rewards accurate diagnosis and patient, progressive treatment. At Regen Health Physicians, Dr. Ajit Dhaliwal combines in-office diagnostic ultrasound, a structured loading program, and — when appropriate — ultrasound-guided PRP for patients at our New York and Salt Lake City locations.

If sit-bone pain has been limiting your running or making it hard to sit through a workday, book a consultation to find out what is driving it and which options make sense for you.

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Medical disclaimer: This article is for educational purposes only and does not constitute medical advice. PRP and other regenerative treatments are not FDA-approved for treating proximal hamstring tendinopathy, results vary between individuals, and no outcome is guaranteed. Consult a qualified physician about your specific condition before starting any treatment.