Patellar tendinopathy symptoms are usually easy to point to: pain in a small spot just below the kneecap, brought on by jumping, squatting, stairs or sitting for a long time with the knee bent. The pain often eases once you are warmed up, then comes back harder later that day or the next morning.
That pattern is what separates it from most other front-of-knee pain. This guide covers what each symptom means, how to tell jumper’s knee apart from the conditions it gets confused with, and how quickly you should act.
One exception first. If your knee gave way with a pop and you now cannot straighten it or lift your leg straight off the bed, that is not tendinopathy. Go to the emergency department the same day.
For everyone else, the outlook is good. Most people with patellar tendinopathy improve with a well-dosed loading program, though it takes months rather than weeks.
Before looking at symptoms one by one, it helps to be clear on what the condition is, because the name itself causes confusion.
What patellar tendinopathy is (and what it is not)
The patellar tendon connects the bottom of your kneecap to your shinbone. It stores and releases energy every time you jump, land, change direction or climb. Patellar tendinopathy is pain and reduced capacity in that tendon, almost always at the point where it attaches to the bottom of the kneecap.
You will see several names for the same problem:
- Jumper’s knee: The common name, because it is most frequent in jumping sports.
- Patellar tendinitis: The older term. It suggests inflammation, which is not the main process in most long-standing cases, so clinicians now prefer “tendinopathy”.
- Patellar tendinosis: Describes structural change inside the tendon. Often used for longer-standing cases.
What it is not:
- Not a tear. Tendinopathy does not involve a sudden loss of the ability to straighten the knee.
- Not arthritis. The pain sits in the tendon, not in the joint.
- Not the same as general pain around the kneecap (patellofemoral pain), which is covered further down.
Why it happens
Tendons adapt to load, but slowly. Patellar tendinopathy develops when the energy-storage load on the tendon (jumping, landing, sprinting, deep squatting) rises faster than the tendon can adapt to it. A new season, a jump in training volume, a switch to a harder court or a return after time off are typical triggers.
That is why the condition clusters in certain sports. In a study of 613 elite Norwegian athletes, current jumper’s knee affected 44.6% of volleyball players and 31.9% of basketball players, against 14.2% across all sports and none in cycling or orienteering [+]. It is also common in runners who add hills or speed work, and in people whose jobs involve repeated squatting or kneeling and climbing.
Knowing the cause makes the symptoms easier to read, because nearly every one of them follows load.
Patellar tendinopathy symptoms, grouped by what they tell you
The two hallmarks clinicians look for are pain localised to the lower pole of the kneecap, and pain that rises as load on the knee extensors rises, particularly during jumping [+]. The rest of the picture fills in around those two.
Where it hurts
- A small, precise spot just below the kneecap, often one you can cover with a fingertip
- Tenderness when you press on the bottom edge of the kneecap
- Usually on one side, though both knees can be affected in jumping athletes
- Pain spread vaguely around or behind the kneecap points more towards a different problem
What brings it on
- Jumping and landing, especially repeated jumps or single-leg landings
- Deep squatting, lunging or getting up from a low chair
- Going down stairs more than going up
- Sitting with the knee bent for a long time (in a car, cinema or plane), sometimes called the “movie-goer sign”
- Kneeling directly on the area
How it behaves through the day
- Pain at the start of activity that eases once you are warm, letting you keep training
- Pain that returns after you cool down, and is often worse the next morning
- Morning stiffness at the front of the knee that loosens over the first few minutes of moving
- A worse day after a heavy session, which is the most reliable way to judge whether you overdid it
What it does to performance
- Lower jump height, or a reluctance to jump off the painful leg
- Less power in sprinting and change of direction
- A feeling that the knee is “weak” when you land, without true giving way
- In longer-standing cases, a thigh that looks smaller on the painful side
Symptoms that suggest something else
- Swelling inside the knee joint, locking or catching
- The knee giving way or buckling
- Pain that is constant, including at rest and at night, unrelated to activity
- Redness, heat or fever
- Pain that started with a single sudden incident rather than building over weeks
None of these fit patellar tendinopathy. They need to be assessed rather than managed as tendon pain.
Knowing what a symptom means is half the question. The other half is how fast to act on it.
How urgently to act on patellar tendon pain
| What you notice | What it may mean | What to do |
|---|---|---|
| A pop, then you cannot straighten the knee or lift the leg straight; a gap below the kneecap | Possible patellar tendon tear | Emergency department the same day |
| Hot, red, swollen knee, with fever or feeling unwell | Possible infection | Emergency department or urgent care the same day |
| Knee locks, gives way, or swells within hours of an injury | Possible internal joint injury | See a doctor or physiotherapist within a few days |
| Pain below the kneecap with sport or stairs, worse the next day | Likely patellar tendinopathy | Book a physiotherapy assessment; adjust load meanwhile |
| Mild ache after a heavy week that settles within 24 to 48 hours | Normal response to training | Monitor; reduce jumping volume if it recurs |
A tendon tear is uncommon, but the signs are distinct: a tearing or popping sensation, an inability to straighten the knee, an indentation below the kneecap and a kneecap that sits higher than usual [+]. Complete tears usually need surgical repair, so delay matters.
The commonest mix-up, though, is not with a tear. It is with general kneecap pain.
Patellar tendinopathy vs patellofemoral pain, and the teenage versions
Both cause pain at the front of the knee, both get worse with squats and stairs, and both are common in active people. The differences are in location and behaviour.
Patellar tendinopathy: Pain at one precise spot below the kneecap, closely linked to jumping and fast loading, typically warming up during activity and worse afterwards. Most common in jumping athletes from late teens to middle age.
Patellofemoral pain: Diffuse pain around or behind the kneecap, harder to point to with one finger, often worse with prolonged sitting, stairs and squatting, and less tied to jumping. Common in runners and teenagers.
Adolescents get their own version. In a growing child, pain at the bottom tip of the kneecap is more likely Sinding-Larsen-Johansson syndrome, and pain over the bump on the shinbone below the knee is more likely Osgood-Schlatter disease. Both involve the growth area where the tendon attaches, and both are managed differently from adult tendinopathy.
Fat pad irritation (just behind and to the side of the tendon) and prepatellar bursitis (swelling over the front of the kneecap) round out the list. Telling these apart is mostly a hands-on job.
What happens at a physiotherapy assessment
A good assessment for suspected patellar tendinopathy relies on your history and on load tests far more than on imaging. Expect your physiotherapist to:
- Ask how the pain started, what changed in your training or work, and how the knee responds the day after activity
- Press along the tendon to find the exact painful spot
- Use a single-leg decline squat to see whether loading the tendon reproduces the pain [+]
- Watch you hop, land and squat, and test thigh, hip and calf strength
- Rule out the joint, the kneecap and the fat pad as the source
- Use a short questionnaire (VISA-P) to give you a baseline score to track progress against
Scans are rarely needed at the start. Changes inside the tendon on ultrasound are found in people with no pain at all; a systematic review found that these changes can predict who later develops tendinopathy, but imaging is only one part of the picture and cannot diagnose it on its own [+]. A scan becomes useful if a tear is suspected or if you are not improving as expected.
In Ontario you can book a physiotherapist directly without a doctor’s referral, though some extended health plans ask for one before they reimburse.
What you can do before your assessment
Until someone has examined the knee, the aim is to calm the tendon down without stopping activity altogether. Complete rest tends to reduce the tendon’s capacity further, which makes the return harder.
- Cut the energy-storage load first: Reduce jumping, sprinting and plyometrics before you reduce anything else. Cycling and swimming are usually well tolerated.
- Use the next-morning check: Pain during activity up to about 3 out of 10 is generally acceptable if it settles by the next morning. If the knee is worse the next day, the previous day’s load was too much.
- Avoid long stretches with the knee bent: Stand up and straighten the leg every 30 to 45 minutes on long drives or at a desk.
- Do not rely on ice, rest or anti-inflammatories as the plan: They may ease pain for a while, but they do not rebuild the tendon’s capacity.
- Skip aggressive stretching or self-massage on the tendon itself: Compressing an irritable tendon often flares it.
Once the diagnosis is confirmed, the core of treatment is a progressive loading program. In a 2021 randomised trial, a progressive tendon-loading program improved symptoms and function more than the traditional eccentric-only approach after 24 weeks [+]. That timeline is realistic: recovery is usually measured in months.
For cases that have not improved after several months of well-run loading, shockwave therapy is sometimes added. It works alongside exercise, not as a replacement for it.
How long patellar tendinopathy lasts, and why it comes back
People often ask whether the pain will go away by itself. A mild case caught early, where load is adjusted quickly, can settle within a few weeks. Established cases usually take three months or more of structured loading, and longer in athletes who need to return to heavy jumping.
Recurrence is common for one reason: the pain settles before the tendon’s capacity has recovered. Returning to full jumping volume as soon as the knee stops hurting is the pattern most likely to bring it back. A return built in steps (running, then jumping, then sport-specific drills, then games) holds up far better than a straight jump back to full training.
What to do next
If your symptoms fit the pattern above (a precise spot below the kneecap, pain that follows jumping and stairs, worse the next day), the next step is an assessment to confirm it and rule out the conditions it mimics. If any of the red flags in the table apply, skip the physiotherapy step and get medical care first.
Toronto Wellness & Physio Center treats patellar tendinopathy through physiotherapy, with shockwave therapy available for stubborn cases, and sees athletes through its sport injury program.
Frequently asked questions
What does patellar tendinopathy feel like?
Most people describe a sharp or aching pain at one spot just below the kneecap. It is worst when jumping, landing, squatting or going down stairs, often eases once you warm up, and is commonly worse later that day or the next morning.
Is patellar tendinitis the same as patellar tendinopathy?
They describe the same condition. “Tendinopathy” is now preferred because most long-standing tendon pain is not mainly an inflammatory problem, which also explains why anti-inflammatories alone rarely fix it.
Can I keep playing sport with jumper’s knee?
Often, yes, with adjustments. Pain during activity of up to about 3 out of 10 that settles by the next morning is usually acceptable. If the knee is worse the next day, or the pain keeps climbing week to week, reduce your jumping volume and get it assessed.
How do I know if I have torn my patellar tendon?
A tear usually comes with a pop or tearing sensation, followed by an inability to straighten the knee or lift the leg straight, a gap you can feel below the kneecap and difficulty walking. That needs the emergency department the same day.
Do I need an MRI or ultrasound to diagnose patellar tendinopathy?
Usually not. The diagnosis is clinical, based on where it hurts and how it responds to load. Tendon changes on scans are common in people without pain, so imaging is mainly used when a tear is suspected or recovery stalls.
How long does patellar tendinopathy take to heal?
Mild early cases can settle within weeks. Most established cases need three months or more of a progressive loading program, and athletes returning to heavy jumping often need longer.
Before you act on any of this
This article explains a common pattern; it cannot tell you what is happening in your knee. Front-of-knee pain from the tendon, the kneecap joint, the fat pad or a growth plate can read almost identically on a page and behave very differently under load, and the right program depends on which one you have. A short assessment will confirm the source and give you a starting load you can trust. You can book with our team for physiotherapy in Richmond Hill or physiotherapy in North York. If you felt a pop and cannot straighten your knee, go to the emergency department instead.