If your sport involves jumping, sprinting or sharp changes of direction, you may know the feeling well: a nagging ache just below the kneecap that starts as something you can push through, then slowly becomes the thing you notice on every landing. That's patellar tendinopathy — still widely known as “jumper's knee.” The reassuring news is that it responds well to the right kind of exercise, even if it can test your patience along the way.
What is it?
Your patellar tendon is the strong, fibrous band that connects the bottom of your kneecap (the patella) to the top of your shinbone (the tibial tuberosity). It's part of the extensor mechanism of the knee — the chain of quadriceps muscle, kneecap and tendon that lets you straighten your leg with force. Every time you land from a jump, drive out of a sprint, squat down or go down a flight of stairs, that tendon is absorbing and then releasing enormous amounts of energy, often several times your body weight in a single landing.
Patellar tendinopathy is what happens when the demand placed on that tendon outpaces its ability to recover between sessions. It's worth clearing up a common misunderstanding: despite the old name “tendonitis,” the tendon isn't simply inflamed. What we actually see on imaging and under the microscope is a tendon struggling with overload, with some disorganisation of its normally neat, parallel collagen fibres, an increase in ground substance, and small areas of poorly organised repair tissue (Cook and Purdam, 2009). That distinction matters clinically, because it changes the plan: rest and anti-inflammatory tablets on their own rarely settle it for good, and can even leave the tendon deconditioned and more vulnerable when you do return to sport.
It also helps to understand that tendinopathy exists on a spectrum rather than being an all-or-nothing diagnosis. Early on, a tendon may be “reactive” — swollen and irritable in response to a sudden spike in load, but still structurally close to normal. Left unmanaged, or repeatedly re-aggravated, it can progress towards “disrepair” and eventually more established “degenerative” changes in a portion of the tendon. The further along that spectrum you are, the longer rehabilitation tends to take — which is exactly why early, correctly-loaded intervention pays off.
Why does it happen?
Tendons like load — that's genuinely how they stay strong, thick and resilient. What they don't like is a sudden spike in load they haven't been prepared for. A jump in training volume, starting a new sport, coming back after a lay-off, a change of playing surface, or a heavy week of jumping on already-tired legs can all tip a healthy tendon into an unhappy one.
It's most common in sports that involve repeated jumping and landing — volleyball, basketball, athletics (particularly high and long jump), and football are the classic examples, which is why some clinicians still refer to it as “jumper's knee.” Studies of elite volleyball and basketball players have found it affects a substantial minority of athletes at some point in a season, with higher rates in those training on hard courts and in those with a history of previous knee problems.
Several factors tend to raise the risk. Tight or weak quadriceps and calf muscles change how load is distributed through the extensor mechanism. Reduced ankle dorsiflexion range forces the knee to absorb more of the landing force. Poor landing mechanics — landing stiffly, with little bend at the knee and hip — dramatically increases the peak load through the tendon compared with a soft, well-controlled landing. Training errors, such as rapidly increasing jump volume before a competition, or stacking plyometric sessions too close together without adequate recovery, are also common triggers. Higher body mass and greater quadriceps strength (paradoxically, because stronger athletes can generate higher forces) have both been associated with increased risk in some cohorts.
In most cases it's not one single factor — it's a story of a little too much load, a little too soon, layered on top of some combination of these predisposing factors. That's exactly why a thorough assessment looks well beyond the knee itself.
What does it feel like?
The pain is usually easy to pin down: right at the bottom of the kneecap, in a spot you can often press on with one finger. It's closely tied to load, so it flares with jumping, landing and going downstairs, and it can grumble after long periods of sitting with the knee bent — sometimes called the “movie sign,” because sitting through a film with a bent knee is enough to bring it on.
A classic clue is that it often warms up during activity — many athletes describe the pain easing once they're a few minutes into training — and then feels worse a few hours later or the next morning. This pattern can be misleading, because it tempts people to keep training through it, not realising the tendon is quietly accumulating damage that shows up as next-day stiffness and pain.
Unlike many other knee problems, there's often no swelling you can see, no clicking, and no sense of the knee giving way or locking. If those features are present, it points towards a different diagnosis, which is one of several reasons a proper assessment is worthwhile rather than assuming every case of anterior knee pain is the same thing.
Conditions that can look similar
Anterior knee pain has several possible causes, and part of a thorough assessment is making sure we're treating the right one. Patellofemoral pain syndrome tends to cause a broader, more diffuse ache around or behind the kneecap rather than a pinpoint spot, and is often worse with squatting, running and stairs in both directions rather than being tied so specifically to landing. Fat pad impingement (Hoffa's syndrome) causes pain just below and either side of the kneecap, often worse with the knee fully straightened, and can be aggravated by hyperextension rather than deep bending. Quadriceps tendinopathy causes a very similar pattern of symptoms but sits just above the kneecap rather than below it. In adolescents who are still growing, Osgood-Schlatter disease causes pain and a visible bony lump at the tibial tuberosity, and needs a different management approach. Less commonly, meniscal pathology can cause anterior or anteromedial knee pain, but usually comes with additional features such as clicking, catching or a sense of the knee giving way. Sorting between these is exactly what a clinical assessment, and where needed, imaging, is for.
How we assess it
A good assessment starts with your story: your sport, how your training has changed recently, and exactly when and how the knee complains. In the clinic we'll look at how you move — including your squat and landing pattern — press along the tendon to find the tender spot, and usually ask you to perform a single-leg decline squat on a small ramp, a simple test that loads the patellar tendon in a controlled way and tends to reproduce the familiar pain.
We'll also check the links in the chain above and below the knee, because tight calves, stiff ankles, weak hips or poor landing control often play a part in why the tendon became overloaded in the first place. A questionnaire called the VISA-P (Victorian Institute of Sport Assessment – Patella) gives us a score out of 100 that we can repeat at intervals to track your progress objectively over the weeks and months ahead, rather than relying on how the knee “feels” on any given day. Imaging — usually ultrasound, occasionally MRI — isn't always necessary for a confident diagnosis, but can be useful in longer-standing or atypical cases, or to rule out other pathology.
How it's treated
Here's the part that surprises people: the main treatment isn't something done to you, it's something you do. Progressive loading — carefully and specifically building the tendon's tolerance to force through a structured exercise programme — is the cornerstone of recovery (Malliaras et al., 2015). We typically move through a series of stages, though the exact timeline varies from person to person depending on tendon severity, training demands and how consistently the programme is followed.
Stage 1 – Isometric loading: we usually begin with sustained, static holds of the quadriceps (such as a wall sit or a straight-leg hold against resistance), typically for around 30–45 seconds at a time, repeated several times. These can meaningfully reduce pain within days and let us start loading the tendon safely without aggravating it, which is particularly useful in the early, more irritable stage.
Stage 2 – Isotonic/heavy slow resistance: once symptoms allow, we progress to slower, heavier strength work — think squats, leg presses and step-downs performed with a controlled, slow tempo — usually building over several weeks. This is where the real structural adaptation of the tendon happens, and it's the stage that demands the most patience, because visible strength gains often outpace the tendon's own adaptation.
Stage 3 – Energy storage/plyometric loading: as strength and symptom control improve, we introduce spring-like, elastic loading — hopping, bounding and jump-landing drills — that mimics the demands of sport but in a controlled, progressive way, gradually increasing volume and intensity.
Stage 4 – Return to sport: the final stage layers in sport-specific movement, change of direction and full training volume, with ongoing monitoring of symptoms to make sure the tendon is coping before full competitive return.
Hands-on treatment has a supporting role throughout this process. Soft-tissue work on the thigh and calf, treatment of the kneecap's movement and tracking, dry needling and supportive taping can all reduce your symptoms in the short term and make it easier to keep loading consistently. They're the supporting cast, not the lead actor. Passive-only approaches, and therapeutic ultrasound in particular, have weak supporting evidence and shouldn't form the whole plan on their own (Challoumas et al., 2021).
The honest bit: this takes time, often a few months rather than a few weeks, and more established cases can take longer still. The tendons that recover best belong to the people who stay consistent with their loading programme, respect the plan even on good days, and resist the urge to test the knee with a big session the moment it feels better.
What you can do yourself
Manage your load first. You don't have to stop everything, but you do need to pull back the activities that consistently spike your symptoms while you build strength underneath them. A simple rule of thumb: a little discomfort during exercise — up to around 3 or 4 out of 10 — is generally acceptable, as long as it settles within 24 hours and isn't worse the following morning. If it lingers beyond that, or is getting worse session to session, you've done too much and need to scale back.
Keep up your prescribed strength work even on the good days — that consistency, not the occasional heroic session, is what actually changes the tendon's capacity over time. Warm up thoroughly before jumping-based training, and pay attention to your landing mechanics: a soft, well-controlled landing through a bent knee and hip spreads load far more kindly through the tendon than a stiff-legged one. Be patient with the timeline, and resist the temptation to chase “zero pain” before returning to sport — a small amount of manageable discomfort during the loading phase is a normal and expected part of recovery, not a sign that something is going wrong.
When to seek help
Book in for an assessment if the pain has been hanging around for more than a few weeks, is limiting your ability to train or play your sport, or keeps returning every time you ramp up training. Get seen urgently, rather than waiting, if you ever feel a sudden pop at the front of the knee followed by an inability to straighten the knee or bear weight — that combination can signal a tendon rupture rather than a tendinopathy, and needs prompt medical attention.
Frequently asked questions
Can I keep playing my sport while I recover? Often yes, in a modified form. Many athletes continue training and even competing at reduced volume while working through a loading programme, guided by the 24-hour pain rule above. Complete rest is rarely necessary and can leave the tendon less prepared for your eventual return.
Will I need an injection or surgery? The great majority of cases settle with a well-run loading programme and never need either. Injections and surgery are reserved for a small minority of long-standing, treatment-resistant cases, and are typically only considered after a genuine trial of structured rehabilitation.
How long until I'm back to full training? This varies considerably, but many athletes are back to modified training within 6–12 weeks and full sport within 3–6 months, depending on how established the tendinopathy was before treatment began and how consistently the programme is followed.
A proper assessment takes the guesswork out of it. At BPR we'll examine the knee, work out exactly what's driving your symptoms, and build you a loading programme that fits your sport, your schedule and where you currently are on the tendon health spectrum — so you can get back to jumping with confidence. You can book an assessment at bpr.rehab.
References
Cook, J.L. and Purdam, C.R. (2009) 'Is tendon pathology a continuum? A pathology model to explain the clinical presentation of load-induced tendinopathy', British Journal of Sports Medicine, 43(6), pp. 409–416.
Malliaras, P., Cook, J., Purdam, C. and Rio, E. (2015) 'Patellar tendinopathy: clinical diagnosis, load management, and advice for challenging case presentations', Journal of Orthopaedic & Sports Physical Therapy, 45(11), pp. 887–898.
Challoumas, D., Pedret, C., Biddle, M. et al. (2021) 'Management of patellar tendinopathy: a systematic review and network meta-analysis of randomised studies', BMJ Open Sport & Exercise Medicine, 7(4), e001110.