Patellar Tendinopathy (Jumper's Knee)
Patellar tendinopathy, often called jumper's knee, is pain in the tendon just below the kneecap. It usually builds up with jumping, landing or deep squatting, and the knee can feel stiff after rest. This page explains the common symptoms and how activity can be adjusted during rehabilitation.
Key points
- What usually helps
- Loading the tendon step by step: holds, then slow, heavy strength work.
- What you can do now
- Use a wall sit or Spanish squat hold. Build up decline squats gradually.
- How long it takes
- Many athletes improve within 12 weeks; the tendon keeps rebuilding for 6 to 12 months.
- When to see a doctor first
- Some signs need medical care the same day. Check the list before you start treatment.
Symptoms
Does this sound like you?
- Pain in a small spot just below the kneecap (the inferior pole of the patella), often worse with jumping, landing or squatting
- Pain that comes on predictably, with the same activities each time
- Morning stiffness at the front of the knee that eases with gentle movement but comes back after rest
- Tenderness when the top of the tendon, where it attaches to the kneecap, is pressed, often with a thickened feel
- Pain after keeping the knee bent for a long time, such as sitting, driving or watching a movie
- A typical warm-up pattern: pain eases during activity, then comes back worse afterward
Often alongside it
- Weakness and loss of bulk in the front thigh muscle (quadriceps), particularly its inner part just above the knee (vastus medialis oblique)
- Tight calf muscles that limit how far the ankle bends up (dorsiflexion) and add strain on the tendon
- Changes in how you jump and land, bending the knee less to avoid pain
- Moving differently at the hip and ankle to protect the knee, leading to other problems
- A tendon that looks or feels thicker, especially compared with the other knee
- A stiff or full feeling in the knee after long activity
Patellar tendinopathy often follows a recognisable progression, although not everyone goes through the same stages. At first, pain comes only after hard activity and does not affect performance. Next comes pain during activity, which may ease as you warm up but returns worse afterward. In later stages there is pain during daily activities, and sport is no longer possible. The main feature is pain linked to load, which tends to increase with springy activities such as jumping. Athletes often describe being able to pinpoint the exact moment in training when pain will begin, such as after a specific number of jumps or at a particular point in their run.
Before using this comparison, check when these symptoms need a doctor first.
When to see a doctor first
Get seen today
Sudden severe pain or a pop while jumping or landing, and you cannot straighten the knee or lift the straight leg
Possible patellar tendon rupture. Go to emergency or an urgent care clinic the same day; a complete rupture needs an early surgical opinion
A newly hot, red or markedly swollen knee, or redness and swelling around the tendon
Possible infection or inflammatory flare. Same-day medical assessment, even without a fever, or go to emergency if you feel unwell
Check with your doctor
Night pain, pain at rest, or pain out of proportion to what you have been doing
Not typical of tendon pain. See your family doctor promptly to look for other causes, such as a bone problem
Weakness that keeps getting worse despite 12 weeks of appropriate rehabilitation
I flag it to your family doctor or a sports medicine physician, who can arrange imaging if it would change the plan
Pain in both knees without a clear change in activity, other painful or swollen joints, or back stiffness that eases as you move
Possible inflammatory arthritis. See your family doctor, who can arrange tests or a rheumatology referral
Treatment
How it is treated
Main approach. Loading the tendon step by step, with holds (isometric exercise), heavy slow strength training or moderate strength training, showed more favourable results than slow-lowering exercise on its own (eccentric exercise) in 2024 reviews of the research.
Alongside it. In season, holding a contraction without moving (isometric holds) may ease pain for a short time and help some athletes keep playing, while heavier, slow strength work builds up how much load the tendon can take, often more fully in the off-season.
Managing it over time. Building up training gradually, with work on landing technique and calf flexibility, may help jumping athletes manage the load on the tendon, although no single changeable risk factor has strong evidence behind it.
A typical rehabilitation progression
Three phases, from settling symptoms to returning to full activity.
Recovery from patellar tendinopathy is usually staged: calm the symptoms first, then rebuild the strength and capacity of the area, then return to your full activities. The phases below show how that can progress.
Phase 1Static Holds and Pain Control (Weeks 1 to 4)
Reduce pain enough to train, start loading the tendon in a predictable way, and set up the 24-hour rule (how symptoms respond by the next day) as the guide for moving on. In Rio and colleagues' 2015 study, holding a contraction without moving ( holds) reduced tendon pain for at least 45 minutes. Later trials have not consistently repeated that, so I use them as an option for in-season athletes rather than something that always eases pain.
Example exercises
- Spanish squat held still (isometric hold) with a band around the knees, 5 sets of 45 seconds at roughly 70 percent effort, once daily
- Leg extension held still with the knee bent to 60 degrees, 5 sets of 45 seconds
- Wall sit with feet slightly forward, 5 sets of 45 seconds, progressed as tolerated
- Single-leg calf raise, 3 sets of 12, building calf strength that takes load off the tendon
- Less sport for now, typically cutting jumping and sprinting by around 50 percent while keeping up fitness work
Possible progression milestones
Pain during Spanish squat hold at or below 3 out of 10, morning stiffness lasting under 10 minutes, and no more than mild symptom rise 24 hours after sessions for 7 consecutive days.
Phase 2Heavy, Slow Strength Training (Weeks 4 to 12)
Build the tendon's ability to take load, using the heavy slow resistance program developed by Kongsgaard and colleagues, which gave results similar to a slow-lowering () program, with greater patient satisfaction. Each repetition is 3 seconds down and 3 seconds up, with heavier weights. Some pain during loading, up to 5 out of 10, is acceptable provided it settles within 24 hours.
Example exercises
- Heavy, slow leg press, 4 sets of 6 to 15 reps, 3 times a week with at least one day between sessions, progressing from a weight you can lift 15 times (15RM) to one you can lift only 6 times (6RM) over the block
- Heavy, slow barbell back squat or goblet squat, with the same timing and sets
- Decline squat (squatting on a board sloped at 25 degrees) with added load, 4 sets of 8 to 10 reps, twice a week
- Single-leg press, 3 sets of 8 to 10 reps, to even out differences between the legs
- Continued strengthening of the calf and the muscle on the side of the hip (), 3 sets of 10 to 12 reps
Possible progression milestones
A score on the tendon questionnaire at least 13 points higher than at the start, pain 3 out of 10 or less on a single-leg decline squat with full body weight, and heavy, slow strength sessions handled without a flare-up over the next 24 hours for at least 2 weeks.
Phase 3Springy Loading and Return to Sport (Months 3 to 6)
Bring back the tendon's spring-like role in jumping and landing (the stretch-shortening cycle). This follows the staged loading approach from Malliaras and colleagues: only move on to jumping drills () once heavy, slow strength work is comfortable. Sport-specific demands, such as cutting, repeated jumping and landing, are rebuilt gradually.
Example exercises
- Countermovement jumps (a quick dip, then jump), starting at 2 sets of 5 on a soft surface, progressing to 4 sets of 10 on firm ground
- Drop jumps from a low box, increasing the height only while you keep landing well
- Bounding and single-leg hops in straight lines, then with change of direction
- Sport-specific drills, such as approach jumps for volleyball or rebounding for basketball, in graded volume
- Return to full training using the 10 percent rule, increasing weekly jumping or sprinting volume by no more than 10 percent
Possible progression milestones
A VISA-P tendon questionnaire score above 80, pain 2 out of 10 or less during sport-specific tasks, single-leg hop distance within 10 percent of the unaffected side, and two weeks in a row of full sport training without a flare-up over the next 24 hours.
What you can do now
- Use a wall sit or Spanish squat hold. Holding a squat still can ease tendon pain for a short time in some people, while loading the tendon in a controlled way. Later trials have not consistently repeated the relief seen in the first study, so use it as a tool, not a cure.Keep pain at 5 out of 10 or less during the hold. Keep the knee lined up over the toes.
- Build up decline squats gradually. Squatting on a slope loads the tendon more than squatting on flat ground, which gives it a useful training stimulus that is easy to control.Start with body weight only before adding weight. Move slowly, 3 seconds down and 3 seconds up.
- Cut jumping, keep other training. Carrying on with adjusted training keeps up your fitness and what the tendon can handle while it heals. Halving the amount of jumping and fast running, while keeping up other training, often lets you keep playing.Keep count of your jumps and landings each week. Alternate hard and easy training days. When you return to full training, increase the load by no more than 10 percent a week.
- Judge each session by the next day. Tendons respond to load over 24 to 48 hours, so symptoms often peak the morning after a heavier session. If pain during activity stayed under 5 out of 10 and settled within 24 hours, the load was acceptable. If it rose above your usual level and stayed raised for more than 24 hours, lower the load next session and carry on with the program.
- Stretch calves and front thighs after warming up. If the ankle cannot bend up far enough (reduced dorsiflexion), more of the landing load shifts onto the tendon. Daily calf stretching and foam rolling can help with this, although the research linking ankle bend and thigh flexibility to jumper's knee is limited or conflicting.Hold each stretch for 30 to 45 seconds. Avoid stretching hard enough to provoke tendon pain.
What I use in clinic
- Static Holds (Isometric Loading). Holding a muscle contraction without moving (an isometric hold) at about 70% of maximum effort, for 45 seconds, 5 times, can reduce pain for a short window after the set. Some athletes use it before training (Rio and colleagues 2015; later studies have not consistently repeated the result).
- Heavy Slow Resistance Training. Heavy weights moved slowly, 3 seconds down and 3 seconds up, at 70 to 85% of the most you can lift once (1RM), gave results similar to a slow-lowering (eccentric) decline squat program, with greater patient satisfaction at 6 months (Kongsgaard et al. 2009).
- Progressive Tendon Loading Program. A 2024 systematic review and network meta-analysis (Li et al., Heliyon) ranked slow strength training favourably, and lowering-only (eccentric) exercise least favourably, among loading approaches for patellar tendinopathy.
- Load Management Education. Athletes who understand how to manage training load, and the rule of checking symptoms 24 hours later, tend to do better and have fewer recurrences than those following generic exercise programs.
- Hip and Ankle Work (Kinetic Chain). Working on weak muscles at the side of the hip (abductors) and an ankle that does not bend up well (limited dorsiflexion), as well as loading the tendon itself, can improve outcomes and reduce the chance of symptoms coming back.
Recovery
How long it takes
Many athletes see meaningful improvement within 12 weeks of an appropriate loading program, and many return to sport over the following months, though recovery times vary considerably. Even so, the tendon keeps rebuilding its structure (remodelling) for 6 to 12 months. In-season athletes can often keep playing with adjusted training during rehab.
Patellar tendinopathy can be persistent and may limit sport for months or longer. Older follow-up studies of athletes (Cook et al. 1997; Kettunen et al. 2002) found that symptoms often lasted a long time, but they cannot predict any one person's course. Recovery varies, and a tailored loading plan can help guide a gradual return; patience is needed because tendons adapt slowly.
What changes the timeline
- How long you have had symptoms before treatment starts: people treated earlier generally respond better than those with symptoms for over a year, though individual response varies
- Keeping up with the loading program matters: doing more of it is linked to better results than doing little of it
- How training load is managed during rehabilitation determines both how fast you recover and the risk of it coming back
- A starting score below 50 on the VISA-P questionnaire (a tendon symptom score) and being over 30 are linked with longer recovery
- A more sensitive nervous system (central sensitization) or fear of movement (kinesiophobia) may need extra education about pain
- Athletes who can keep up their fitness with other training do better, both mentally and physically
How I track it. I track pain on a 0 to 10 scale during specific loading activities, like a single-leg squat on a slope (decline squat) and jumping, and I check how symptoms respond 24 hours later to make sure the loading is right. Regular testing of thigh muscle strength, pushing against resistance without moving (isometric testing), gives a measured strength figure
Similar conditions
Conditions that can feel similar
- Patellofemoral Pain Syndrome
- Widespread pain behind or around the kneecap rather than tenderness in one spot just below it. It is aggravated by stairs, running and long sitting with the knees bent, and pressing the kneecap into the joint is painful (patellar compression test). A single-leg squat on a slope (decline squat) generally does not bring on pain where the tendon attaches.
- Quadriceps Tendinopathy
- Tenderness just above the kneecap (the superior pole of the patella) rather than just below it, with pain when straightening the knee against resistance and with deep squatting. More common in weightlifters and middle-aged athletes than in teenage jumpers.
- Hoffa's Fat Pad Impingement
- Pain and swelling below the kneecap on either side of the tendon, worse when the knee straightens fully and with long standing. Pressing on the fat pad while you straighten the knee brings on the pain (Hoffa's test).
- Osgood-Schlatter Disease
- Pain and a bump at the bony point at the top of the shin (the tibial tubercle), rather than just below the kneecap. Typically ages 10 to 15 during growth spurts, with a visible bony lump where the tendon attaches to the shin.
- Plica Syndrome
- Snapping or catching along the inner edge of the kneecap, with a thickened band that can be felt and is tender every time it is pressed. Symptoms come with repeated bending and straightening rather than with heavy loading alone.
- Meniscal Pathology
- Tenderness along the joint line rather than over the tendon, catching, locking or a feeling of giving way, and pain on twisting and bending tests (McMurray or Thessaly tests). There is often a twisting injury.
- Patellar Stress Fracture or Sinding-Larsen-Johansson
- Night pain, pain at rest, and pain out of proportion to the activity done, tenderness in one spot on the bone rather than the tendon, a recent sharp jump in training load, and swelling inside the bone on MRI (bone oedema).
Commonly confused with
Side-by-side comparisons for patterns that often get mistaken for patellar tendinopathy (jumper's knee).
Questions
What patients ask me most
How long does patellar tendinopathy take to heal?
Most people notice meaningful improvement within 12 weeks of a structured loading program, but the tendon keeps rebuilding its structure (remodelling) for 6 to 12 months. Having symptoms for longer before starting rehab consistently predicts slower recovery. Athletes who start a loading program within a few months of symptoms starting generally do better than those whose symptoms have been present for over a year. Consistency with loading matters more than intensity, and realistic expectations up front help patients stay committed while the tendon slowly adapts.
Should I stop running or jumping if I have jumper's knee?
Complete rest is rarely the answer. Tendons need load to remodel, and prolonged rest often weakens them further. The usual approach is modifying volume rather than stopping: reducing jumping and high-speed running by around 50% and adding heavy slow resistance work often allows continued sport participation. The 24-hour rule guides dosage. If pain during activity stays under 5/10 and settles within 24 hours, the load was acceptable. These are example monitoring limits, not proof that running is safe for every cause of pain.
Does rest alone help patellar tendinopathy?
Rest can reduce pain short-term, but it does not prompt the changes in structure the tendon needs. The consistent message across recent systematic reviews and clinical guidance is that progressive loading is the main treatment. Patients often cycle through weeks of rest, return to sport, and find symptoms come back within days. Loading exercises rebuild what the tendon can handle so it can take sport demands again.
Are cortisone injections safe for patellar tendinopathy?
I advise caution. An injection can reduce pain short-term, but the Coombes et al. Lancet 2010 systematic review showed that for tendinopathies, corticosteroid injection produces worse outcomes in the medium and long term compared with other treatments, including exercise. Corticosteroid can also weaken tendon structure. I use cortisone conversations as a chance to explain why loading, not masking symptoms, is the route back to sport.
When does patellar tendinopathy need surgery?
Surgery is uncommon, and reserved for patients who have completed at least six months of well-structured loading rehabilitation without meaningful progress. Even then, surgical outcomes are not dramatically better than continued non-surgical care in most studies. Before considering surgery, I review whether the loading program was truly progressive, whether the hip, ankle, and calf were addressed, and whether sleep, training load, and nutrition have been optimised.
Can I keep playing sport during the season while rehabbing jumper's knee?
Often yes. Some people get short-term relief from exercises that hold a muscle contraction without moving (isometric exercise). In a small study of six volleyball players (Rio et al., BJSM 2015), a specific isometric knee-straightening protocol eased pain for at least 45 minutes. Later trials have not consistently repeated that, and no hold guarantees a set period of relief, so choose a tolerable exercise, such as a Spanish squat or wall sit, and use your response to guide the next session. A reasonable in-season plan is isometric holds plus less jumping, then building heavy, slow strength work more aggressively in the off-season.
What is the difference between patellar tendinopathy and patellofemoral pain?
Patellar tendinopathy causes pain and tenderness in one spot at the bottom tip of the kneecap, where the tendon attaches, and it tends to flare with loading activities like jumping or squats on a slope (decline squats). Patellofemoral pain is more spread out, sits behind or around the kneecap, and is aggravated by stairs, running and long sitting with bent knees. The difference matters because the rehabilitation programs differ significantly in focus and progression.
Why does my knee hurt more the day after exercise?
Tendons respond to load over 24 to 48 hours, so the morning after heavier activity is often when symptoms peak. If pain rises above your usual level and stays raised for more than 24 hours, the previous session was too much for what the tendon can currently handle. That is real-time feedback, not a reason to stop. Lower the load for the next session and continue the program.
The science
The Science of Patellar Tendinopathy (Jumper's Knee)
Patellar is a persistent tendon problem, most often where the patellar tendon attaches to the bottom of the kneecap (the inferior pole of the patella). It involves changes in the tendon's structure and in how pain is processed, and inflammation can be part of a more complex process. Symptoms do not reveal a precise tissue stage.
The begins with repetitive microtrauma from jumping and landing activities that overwhelm the tendon's capacity to repair. This creates microscopic failures within the tendon structure, leading to alterations at the cellular level that undermine its mechanical properties. The normal parallel arrangement of type I fibers becomes disrupted, replaced by areas of mucoid and increased ground substance that weakens the tendon's tensile strength.
At the cellular level, tenocytes undergo significant changes in response to repetitive loading. These cells alter their protein and enzyme production, increasing prostaglandin E2 and leukotriene B4, which contribute to the degenerative process. Matrix metalloproteinase activity increases, breaking down the extracellular matrix faster than it can be rebuilt. Simultaneously, vascular endothelial growth factor production leads to , bringing new blood vessels and nerve fibers into areas that are normally , contributing to pain sensation.
The tendon's appearance changes dramatically at the microscopic level. Instead of tightly packed, parallel collagen bundles, affected tendons show areas of fibrinoid necrosis, pseudocyst formation, and random collagen orientation. There's hypercellularity with atypical fibroblast proliferation and areas of cell death through apoptosis. This creates the characteristic thickened, painful tendon seen clinically, often described as having a "mucoid" appearance on imaging.
Older descriptions called this a purely degenerative, non-inflammatory condition. More recent research describes a mixed picture, with immune cells and inflammatory mediators also involved (Millar et al., Nature Reviews Disease Primers, 2021), so neither label tells the whole story. What has held up is the shift in treatment away from anti-inflammatory approaches toward loading programs that help the tendon adapt.
Contributing factors
The patellar tendon experiences extraordinary mechanical loads during jumping and landing activities that predispose athletes to . During the phase of landing from a jump, your quadriceps must generate high forces while lengthening to control knee flexion and decelerate your body's downward momentum. Research using force plates and inverse-dynamics modelling shows that landing from a vertical jump creates patellar tendon forces of several times body weight, with estimates in the range of roughly 4-5 times, concentrated at the bone-tendon interface where most commonly develops.
Jumping ability and jump volume both shape how much the tendon is loaded. Athletes who jump higher generate greater tendon loading with each repetition, although a systematic review of risk factors (Sprague et al., BJSM 2018) found only limited or conflicting evidence that greater jump height on its own predicts who develops the condition. When you perform hundreds or thousands of jumps weekly in sports like volleyball or basketball, these accumulated high-magnitude loads can exceed the tendon's adaptive capacity, particularly during periods of rapid training volume increases.
Squatting mechanics dramatically influence patellar tendon loading magnitudes. Biomechanical studies demonstrate that performing squats on a 25-degree decline board maximizes patellar tendon strain compared to level-ground squats. During decline squats, your knees translate further forward over your toes, increasing the moment arm and requiring greater quadriceps force production. Research using ultrasound elastography shows significantly greater patellar tendon strain, smaller ankle and hip joint angles, and higher knee extensor muscle EMG amplitudes during decline squats. This explains why decline squat protocols effectively load the tendon therapeutically but can also contribute to overload if training volume isn't managed properly.
Sports involving high eccentric quadriceps loading create the greatest risk for patellar tendinopathy. Volleyball players performing spike approaches, basketball players landing from rebounds, long and high jumpers in track and field, long-distance runners absorbing repetitive impact forces, and skiers controlling descent all expose their patellar tendons to sustained eccentric loads. Studies tracking volleyball athletes show patellar tendinopathy prevalence rates of 40-50% in elite players, with rates correlating directly with years of competitive participation and weekly jump volume.
Hip and ankle significantly influence patellar tendon loading through effects. Reduced ankle range forces your knee to translate less far forward during squatting and landing, theoretically reducing patellar tendon moment arm. However, this compensation often increases hip flexion demands and alters landing mechanics in ways that can increase injury risk elsewhere. Research demonstrates that hip muscle weakness, particularly of the gluteus maximus and medius, associates with increased knee during landing, altering the line of quadriceps force application and creating asymmetrical patellar tendon loading patterns.
Training load progression rates critically affect whether tendon loading stimulates adaptation or causes breakdown. Your patellar tendon adapts to mechanical stress through increased synthesis and cross-linking, but this process requires 36-72 hours. When training volume or intensity increases too rapidly, you accumulate tendon microdamage faster than repair mechanisms can address it. Rapid increases in weekly jump volume relative to what the tendon has adapted to can elevate tendinopathy risk. Elite volleyball players transitioning from off-season to pre-season training demonstrate the highest injury rates during these rapid loading progressions.
Landing mechanics and knee flexion angles during ground contact determine peak patellar tendon forces. Stiff-legged landings with minimal knee flexion, common in fatigued athletes or those with pain-avoidance patterns, dramatically increase peak tendon loading. When you land with only 30-40 degrees of knee flexion versus 60-80 degrees, the reduced motion range means your quadriceps must generate higher forces over shorter time periods to dissipate the same kinetic energy. Biomechanical analysis shows that landing with reduced knee flexion can increase peak patellar tendon forces, explaining why fatigue-related technique breakdown contributes to injury risk.
Body mass significantly influences absolute patellar tendon loading. Each kilogram of body weight directly increases the gravitational force your tendon must resist during landing and deceleration. Research shows direct correlation between body mass index and patellar tendinopathy prevalence in jumping sports. Weight gain translates into additional peak tendon force during landing from a countermovement jump, representing a load increase that may exceed tendon adaptive capacity if weight gain occurs rapidly without proportional strength increases.
Research
What the studies show
Few changeable risk factors for patellar tendinopathy have strong evidence behind them
A 2018 review that pooled 31 studies (Sprague and colleagues, British Journal of Sports Medicine) found no strong evidence for any changeable risk factor in athletes. There was limited or conflicting evidence for less upward ankle bend (dorsiflexion), less flexibility at the back of the thigh and in the quadriceps, more jump training, more volleyball sets per week, greater jump height (in a countermovement jump) and more overall activity. Pooled data linked more activity, higher body weight and greater jump height with having the condition; these were associations, which cannot show which came first.
Training volume, jump load and body weight are reasonable things to look at when planning rehabilitation and return to sport, keeping in mind that the evidence linking them to the condition is limited.
Sprague AL, Smith AH, Knox P, et al. (2018). Modifiable risk factors for patellar tendinopathy in athletes: a systematic review and meta-analysis. Br J Sports Med. PMID: 30054341.
Guides on knee pain
Longer explanations of symptoms and scan-report wording.
- Pain Right Below the KneecapA single tender spot below the kneecap that flares with jumping, stairs, or deep squats. Most commonly patellar tendinopathy in active adults, and growth-plate conditions in young athletes.
- Suprapatellar Effusion (Fluid on the Knee)Extra fluid inside the knee joint, seen in the pouch above the kneecap. What the size words on a report mean, the usual causes by how quickly the swelling came on, and when to see a doctor first.
- Joint Space Narrowing in the KneeThe gap between the bones looks thinner than expected on an X-ray. What medial, tricompartmental and the severity words mean, how it relates to pain, and what the guidelines recommend.
Related Conditions
Conditions I commonly see alongside, or confused with, this one.
ACL Injuries
Both common in jumping sports; altered landing mechanics affect both structures
Hip Osteoarthritis
Hip stiffness can alter knee mechanics and increase patellar tendon stress
Patella Fractures
Both affect the front of the knee and are assessed together after a fall onto the kneecap
MCL/LCL Sprains
Getting back to it
Physiotherapy for patellar tendinopathy (jumper's knee), built around the activity you want back.
