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Health condition · Clinically reviewed

Knee tendonitis, progressive loading, shockwave - and when surgery fits.

Jumper's knee is common, treatable and rewards the right dose of load. A structured plan beats endless rest and painkillers.

Jump to treatment
A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against BASEM, BJSM and peer-reviewed sports medicine sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK sports medicine practice including heavy slow resistance loading and shockwave therapy.

Key facts

Knee tendonitis at a glance.

The essentials in plain English - what it is, who gets it, and how it is treated in the UK today.

  • What it is

    A degenerative tendinopathy of the patellar or quadriceps tendon driven by repetitive loading rather than pure inflammation.

  • Also known as

    Jumper's knee, patellar tendinopathy or quadriceps tendinopathy - depending on which tendon and which pole is involved.

  • Who gets it

    Common in jumping and change-of-direction sports - volleyball, basketball, athletics and football in particular.

  • Where it hurts

    Localised pain at the inferior pole of the patella for patellar tendinopathy, or the superior pole for quadriceps.

  • Foundation therapy

    Progressive tendon loading - eccentric and heavy slow resistance work - is the gold standard, guided by physiotherapy.

  • When to escalate

    Persistent or refractory pain warrants specialist musculoskeletal or sports medicine review for imaging and adjuncts.

Why this guide matters

A tendon problem, not an inflammation problem.

Modern sports medicine treats jumper's knee as a degenerative tendinopathy - progressive loading, technique work and selective adjuncts do the heavy lifting.

  • Loading is the medicine

    Eccentric and heavy slow resistance work rebuild tendon capacity - the single most evidence-backed intervention.

  • Rest alone rarely fixes it

    A tendon that is under-loaded becomes weaker and more painful when you try to return - modify, do not stop.

  • Adjuncts have their place

    Shockwave, PRP and image-guided injections can help refractory cases when structured rehab is not enough on its own.

How the diagnosis is made

From first twinge to a clear plan.

The steps a UK GP, sports medicine doctor or musculoskeletal physiotherapist will normally follow, in order.

  1. 01

    Assessing

    History and activity profile

    A structured look at training load, sport, jumping and squatting volume, symptom onset and any recent step-up in activity.

  2. 02

    Assessing

    Red flag screen

    Sudden pop, giving way, inability to straight-leg raise or extend the knee - features that point to a partial or complete tendon tear.

  3. 03

    Assessing

    Focused examination

    Palpation of the patellar and quadriceps tendon poles, resisted knee extension and a single-leg decline squat to reproduce symptoms.

  4. 04

    Confirming

    VISA-P scoring

    The Victorian Institute of Sport Assessment for the patellar tendon puts a number on symptoms, function and sport - a baseline to track progress.

  5. 05

    Confirming

    Differential diagnosis

    Distinguishing tendinopathy from patellofemoral pain, prepatellar bursitis, Osgood-Schlatter, Sinding-Larsen and a partial tear.

  6. 06

    Imaging

    Ultrasound if uncertain

    A specialist musculoskeletal ultrasound can visualise tendon thickening, hypoechoic changes and neovascularisation when the picture is unclear.

  7. 07

    Imaging

    MRI in selective cases

    A private MRI scan is reserved for refractory disease, suspected partial tear or when other intra-articular pathology needs excluding.

Typical timeline: a first visit to a settled plan in weeks, with rehab measured in months.

Symptoms

What knee tendonitis actually feels like.

Localised anterior knee pain that tracks with loading. And the features that mean it is time to seek specialist review rather than push on.

  • Anterior knee pain

    Aching or sharp pain at the front of the knee, worst during and after loading activity.

  • Tender inferior patellar pole

    Point tenderness right at the bottom of the kneecap - the classic patellar tendinopathy sign.

  • Tender superior patellar pole

    Point tenderness at the top of the kneecap - the pattern seen in quadriceps tendinopathy.

  • Worse with jumping and squatting

    Symptoms flare during landings, deep squats and lunges - anything that loads the extensor mechanism.

  • Kneeling and stair discomfort

    Kneeling and descending stairs are commonly provocative - useful markers of symptom severity over time.

  • Morning stiffness

    A stiff, warm-up phase in the tendon that eases with gentle movement but returns with heavier loading.

  • Progressive pattern

    Symptoms typically build over weeks or months, often after a training-load spike or a change in surface or footwear.

  • Red flag - sudden pop or weakness

    A sudden pop, inability to extend the knee or a palpable gap needs urgent review to exclude a tendon tear.

Treatment

How knee tendonitis is treated in the UK.

Structured loading first, adjuncts next - and injections or surgery reserved for the small group that does not settle with rehab.

  • Load management and relative rest

    Reducing the aggravating volume without complete rest - the tendon needs progressive load, not immobilisation.

  • Progressive tendon loading

    Eccentric and heavy slow resistance exercises are the gold standard, delivered through specialist musculoskeletal physiotherapy.

  • NSAIDs and analgesia

    A short course of anti-inflammatories or simple analgesia to keep rehab tolerable - not a stand-alone fix.

  • Biomechanics and technique review

    Landing mechanics, gait and single-leg control - specialist assessment addresses the drivers rather than just the pain.

  • Extracorporeal shockwave therapy

    Focused or radial shockwave, delivered in a specialist commissioned service, has evidence as an adjunct in refractory tendinopathy.

  • PRP or high-volume image-guided injection

    Platelet-rich plasma or HVIGI are selective, specialist-led options for tendinopathy that has not settled with structured loading.

  • Corticosteroid injection

    Reserved for very selected cases under specialist musculoskeletal care - carries a real risk of tendon rupture and is not first-line.

  • Surgical debridement or repair

    For truly refractory disease, open or arthroscopic tendon debridement or patellar tendon repair is a specialist commissioned option.

A stepped pathway

A typical UK plan begins with load management and specialist musculoskeletal physiotherapy, layers in shockwave therapy where structured loading plateaus, and only moves to image-guided injections or surgical debridement when a well-delivered conservative programme has run its course. An MDT view - sports medicine, musculoskeletal medicine and physiotherapy - keeps the plan coherent.

What this guide is based on

The sources behind every claim on this page.

UK sports medicine society standards and peer-reviewed research, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP, sports medicine doctor or musculoskeletal physiotherapist knows your knee and training history and can tell you which parts apply to you.

  • British Association of Sport and Exercise Medicine (BASEM). Guidance on tendinopathy management.

  • British Journal of Sports Medicine (BJSM). Consensus statements on patellar tendinopathy.

  • NICE Clinical Knowledge Summary. Knee pain - assessment.

  • Cochrane Reviews. Exercise therapy for patellar tendinopathy.

Red flags

When knee pain needs urgent attention.

Most tendinopathy is managed well in primary care and physiotherapy. These are the features that need a specialist opinion, sometimes urgently.

  • Sudden pop with loss of extension

    A sudden pop during loading followed by inability to actively extend the knee suggests a patellar or quadriceps tendon rupture and needs urgent review.

  • Palpable gap in the tendon

    A visible or palpable defect in the tendon, especially after a fall or forceful contraction, warrants same-day specialist assessment.

  • Systemic features

    Fever, red hot swollen joint or unwell patient - think septic arthritis or another inflammatory cause rather than tendinopathy.

  • Night pain and rest pain

    Persistent night pain or rest pain that does not fit an activity pattern deserves a wider workup and specialist opinion.

  • Locking or true giving way

    Mechanical locking or the knee genuinely buckling points to an intra-articular problem such as a meniscal or ligament injury.

  • Bilateral spontaneous tendon pain

    Bilateral tendinopathy without a load trigger, especially on fluoroquinolone antibiotics or long-term steroids, needs a medication review.

  • Paediatric anterior knee pain

    A skeletally immature athlete with tibial-tuberosity or inferior-pole pain is more likely to have Osgood-Schlatter or Sinding-Larsen than adult tendinopathy.

  • Failure to improve at 12 weeks

    Well-delivered loading rehab that has not moved the dial by 12 weeks is a signal to reimage and reassess the diagnosis.

  • Recurrent partial tear

    Recurring partial-thickness tears on imaging need specialist musculoskeletal input on load, adjuncts and surgical thresholds.

Living with it

A treatable condition, with a clear ladder.

Four things that make the biggest day-to-day difference - dose the load, be patient with rehab, fix your technique and know when to escalate.

A quiet reminder

Consistency beats intensity, every time.

A modest, well-tolerated dose of loading three times a week for months does more than a heroic fortnight followed by a fresh flare.

  1. 01 Load

    Manage the dose, do not stop

    The tendon responds to the right amount of load - too much flares it, too little weakens it. Modify volume, keep moving.

  2. 02 Patience

    Give rehab 12 weeks and beyond

    Progressive loading works, but slowly. Judge success in months, not weeks - and keep the exercises going once you feel better.

  3. 03 Technique

    Fix the landings and the squat

    Small changes in landing mechanics and single-leg control often unload the tendon more than any injection can.

  4. 04 Escalate

    Do not settle for chronic pain

    If structured rehab has not helped, ask about shockwave, injectable options and specialist musculoskeletal review before it becomes a career problem.

Frequently asked

Everything we get asked about knee tendonitis.

Quick answers on loading rehab, imaging, shockwave, injections and when surgery is worth considering.

  • What exactly is knee tendonitis?

    It is a tendinopathy of the patellar or quadriceps tendon caused by repetitive overloading rather than classical inflammation. The tendon shows structural change with disorganised collagen and, in some cases, neovascularisation. The most common variant is patellar tendinopathy, also called jumper's knee.

  • How is it different from patellofemoral pain or bursitis?

    Tendinopathy is localised to the tendon pole and reliably reproduced by loaded knee extension or a single-leg decline squat. Patellofemoral pain is more diffuse around the kneecap and worst on stairs and sitting. Prepatellar bursitis presents with a swollen, tender bursa in front of the kneecap, covered on our knee bursitis page.

  • Do I need a scan?

    Not usually. The diagnosis is clinical, and imaging changes such as tendon thickening are common in people without any symptoms. A specialist musculoskeletal ultrasound or private MRI scan is reserved for uncertain diagnoses, suspected partial tears or persistent symptoms that have not settled with structured rehab.

  • What actually works long-term?

    Progressive tendon loading is the gold standard. Eccentric protocols and heavy slow resistance work, delivered through specialist musculoskeletal physiotherapy, build tendon capacity and reduce pain over 12 weeks and beyond. Load management and technique work sit alongside this and do most of the heavy lifting.

  • Should I get a steroid injection?

    Rarely, and only under specialist care. Corticosteroid injection can settle pain in the short term but carries a real risk of tendon weakening and rupture, particularly in loaded weight-bearing tendons. Shockwave therapy, PRP and high-volume image-guided injection are usually preferred adjuncts when loading alone is not enough.

  • When is surgery considered?

    Surgery is a last-line option for truly refractory patellar tendinopathy that has failed 6 to 12 months of structured rehab and reasonable adjuncts. Options include open or arthroscopic tendon debridement and, where there is a significant partial tear, patellar tendon repair - always through a specialist commissioned pathway.

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