Padel Patellar Tendinitis: Jumper’s Knee
Pain at the bottom tip of the kneecap that builds every time you split-step, lunge, or push off court. This is patellar tendinopathy — a degeneration injury, not an inflammation injury — and the treatment that works is not rest. It is the right kind of load.
Isometric hold duration. Four 45-second isometric holds at 70% of max effort provide analgesic relief that lasts 45 minutes or more — a match-day management tool with real evidence behind it.
Heavy slow resistance programme. The Purdam protocol takes 8 to 12 weeks of consistent, heavy loading to rebuild collagen structure and restore tendon capacity.
The diagnostic scoring system. The Victorian Institute of Sport Assessment-Patella scale scores your tendon function 0-100. Below 40 means you cannot play. Above 80 is full return to court.
In short: patellar tendinitis is a misnomer. Modern sports medicine calls it tendinopathy because there is no active inflammation in established cases — the tendon has developed disorganised, degenerated collagen fibres. Padel causes this through repeated knee loading during split-steps, lunges, and push-offs. Treatment that works is not rest, not stretching, and definitely not cortisone injections into the tendon. It is progressive heavy loading: the right exercise, at the right weight, at the right tempo, consistently over 8 to 12 weeks.
The Anatomy: Three Structures You Need to Understand
Patella, patellar tendon, quadriceps tendon — and where the pain actually lives.
The quadriceps tendon attaches the four quadriceps muscles to the top of the patella (kneecap). It carries the contractile force of the quads downward into the patella. This tendon sits above the kneecap and is occasionally injured in older players or those with very high quad loading, but it is not the primary site of patellar tendinopathy.
The patella is a sesamoid bone — a bone embedded within a tendon — that acts as a pulley for the quadriceps mechanism. It sits in the trochlear groove at the front of the femur and transmits force between the quadriceps tendon above and the patellar tendon below. The inferior pole of the patella (the bottom tip) is the exact attachment point of the patellar tendon, and it is precisely here that patellar tendinopathy begins. When you feel pain at the very bottom point of your kneecap, that is the bone-tendon junction under stress.
The patellar tendon runs from the inferior pole of the patella down to the tibial tuberosity — the bony bump you can feel at the top of the shin, just below the kneecap. It is approximately 3 to 4 centimetres long and 3 to 5 millimetres thick. Its job is to transmit the full force of quadriceps contraction across the knee joint to the tibia, driving knee extension. Every push-off, every split-step, every lunge loads this tendon. Patellar tendinopathy is a degeneration of the collagen fibres within this tendon, most commonly at the proximal attachment — the junction with the inferior pole of the patella.
Why Padel Causes Patellar Tendinopathy
Every split-step, every lunge, every push-off loads the tendon. Volume is the mechanism.
The padel split-step is executed on almost every point — typically 80 to 120 times in a 90-minute session. The movement involves landing on both feet simultaneously with the knees bent, absorbing body weight, then immediately pushing off in a chosen direction. This landing-and-push-off cycle creates a significant eccentric-concentric loading demand on the patellar tendon. The tendon must absorb deceleration force through the landing phase and then generate extension force through the push-off phase. In a single session this represents hundreds of high-load patellar tendon cycles.
Padel is played on a 10×20 metre enclosed court, so every sprint is short and followed immediately by deceleration and a direction change. Deceleration from a sprint places the patellar tendon under peak tensile stress as the quadriceps contract eccentrically to slow the leg. The rapid succession of these sprint-stop-push cycles across a full match means the tendon rarely gets a sustained recovery period between peak loading events.
Padel requires deep knee flexion to retrieve low balls, play from the back corners, and defend against powerful smashes. In these positions, the patellar tendon is stretched to length under load — a combination of high tensile stress and significant quadriceps force demand. Players who regularly chase glass-wall shots or play an aggressive net game frequently enter positions where the knee bend exceeds 90 degrees under body weight plus the force of reaching and striking. This is one of the highest-stress positions for the patellar tendon.
- Players who recently increased their session frequency — the most common pattern
- Players returning from a break who resume full volume without a graduated build
- Players with limited ankle dorsiflexion — stiff ankles force greater knee flexion under load, increasing patellar tendon stress
- Players with weak hip extensors (glutes) — poor glute function pushes more of the push-off load onto the knee extensors
- Players who skip adequate warm-up — tendons are less compliant in cold tissue and benefit from progressive loading before high-intensity play
The Tendinopathy Model: Why “Tendinitis” Is Wrong
No inflammation. Disorganised collagen. A three-stage continuum that changes treatment.
- Disorganised collagen fibres — the normally parallel, tightly packed collagen structure is disrupted into a tangled, irregular matrix
- Increased ground substance — the material between fibres increases, making the tendon appear swollen on imaging despite low inflammatory cell count
- Neovascularisation — new, abnormal blood vessels grow into the tendon (normally tendons are relatively avascular), accompanied by nerve ingrowth that creates pain
- No inflammatory infiltrate — the classic markers of inflammation (neutrophils, macrophages in acute phase) are absent in established cases
The tendon has been overloaded faster than it can adapt. This is a non-inflammatory proliferative response — the matrix thickens to protect the collagen fibres from further damage. At this stage the changes are potentially reversible with load reduction. The management approach is to reduce the provocative load immediately (not necessarily stop completely) and avoid activities that compress the tendon at the proximal attachment. Compressive loading — such as deep knee flexion against resistance — is particularly damaging at this stage because it combines tensile and compressive stress at the inferior pole. Isometric exercises are the preferred loading strategy: they maintain tendon stimulus without adding the compressive component.
The tendon has attempted to repair but the healing process has not produced normal collagen structure. The matrix is disorganised, new blood vessels and nerve fibres have grown into the tendon, and the tissue is mechanically compromised compared to a healthy tendon. This is the stage most padel players are at when they finally seek help. Load management is still required, but the treatment focus shifts to progressive tendon loading — specifically the heavy slow resistance protocol — to stimulate collagen synthesis and remodelling toward a more organised structure.
Areas of the tendon have lost their cellular and matrix integrity entirely. This stage is associated with the highest risk of tendon rupture, because the degenerate zones have essentially no tensile strength. In older players with long-standing tendinopathy, some degenerate regions may not be reversible. However, the reactive and disrepair portions of the tendon (which always coexist with degenerative zones) can still respond to progressive loading. Treatment at this stage is more complex and often requires specialist assessment, but heavy slow resistance loading remains the cornerstone of rehabilitation.
The VISA-P Score: How Clinicians Measure Your Tendon Function
Eight questions, scored 0-100. Your number determines whether you should be playing.
Significant functional impairment. Playing at this level risks accelerating tendon degeneration. Rehabilitation only until score improves.
Can participate with load modification. Reduced session volume, no tournaments without active rehab programme running in parallel.
Functional criteria met for return to competitive padel. Continue maintenance loading 2x per week indefinitely.
VISA-P Question Summary
The eight domains assessed — all scored on a 0 to 10 scale.
Note: The sport participation question carries 30 of the 100 possible points, which means players still playing at reduced intensity can score moderately without being close to true recovery. Track your VISA-P score every 2 to 3 weeks during rehabilitation to objectively monitor progress.
What Actually Works: Treatment by Stage
Isometric holds for acute pain. Heavy slow resistance for rehabilitation. Never cortisone.
Isometric Loading: The Match-Day Management Tool
Stage 1 and in-season use — 4 x 45-second holds, pain relief lasts 45+ minutes.
Exercise: Seated leg extension or Spanish squat (back against wall, feet forward, knee at 60 degrees) — held at a fixed angle without movement.
Load: 70% of maximum voluntary contraction — heavy enough to feel significant effort, but not maximum exertion.
Duration: 45 seconds per hold.
Sets: 4 holds, with 2-minute rest between each.
Timing: Can be done before matches (30-45 minutes before) for pain relief during play. Also appropriate as the only loading format during Stage 1 (acute, first 2 weeks).
Avoid: Deep knee flexion during the hold (below 60 degrees). This adds compressive stress to the inferior pole and negates the isometric benefit at the reactive stage.
Heavy Slow Resistance: The Purdam Protocol
The main rehabilitation method for established tendinopathy. 8-12 weeks, 3x weekly.
Start with the leg press rather than squats. The leg press allows controlled loading of the patellar tendon without the compressive forces at the inferior pole that a free squat creates when the knee tracks forward over the toes. Set the leg press seat so that the bottom position is approximately 60 to 70 degrees of knee flexion — do not go to full depth in the early weeks.
As pain settles and strength improves, introduce squat-pattern loading. The hack squat machine or a goblet squat (holding a weight at the chest, which shifts the load posteriorly and reduces inferior pole compressive stress) are preferred over a standard barbell back squat at this stage. Maintain the 3-second down, 3-second up tempo. Depth progresses from 60 degrees toward 90 degrees as tolerated — defined as pain during the exercise no greater than 3 out of 10 on a numerical rating scale.
Introduce single-leg loading — decline board squat or Bulgarian split squat — to address any bilateral strength asymmetry and to build sport-specific single-leg capacity. The decline board (15 to 25 degrees) increases patellar tendon loading through a greater range of stretch, which stimulates collagen synthesis more effectively as the tendon becomes more tolerant. This is the progression toward plyometric readiness. Continue the 3-second tempo.
What to Avoid: Cortisone, Aggressive Stretching, and PRP
The evidence on three common but incorrect treatment approaches.
Corticosteroid injections directly into the patellar tendon are associated with increased risk of tendon rupture and are contraindicated in established patellar tendinopathy. Cortisone reduces the short-term pain response by suppressing the remaining cellular activity in the tendon, but this comes at the cost of further weakening already compromised collagen structure. Multiple studies have shown worse long-term outcomes (at 6 and 12 months) for tendinopathy treated with cortisone versus exercise rehabilitation alone. Peritendinous injections (around the tendon, not into it) carry less risk but still do not address the structural problem. If a clinician recommends a direct cortisone injection into your patellar tendon, seek a second opinion.
Stretching the quadriceps loads the patellar tendon at its full length under stretch tension, which applies compressive stress to the inferior pole. In the reactive and early disrepair stages this adds load to tissue that is already overloaded and attempting to settle. Gentle, non-provocative stretching in positions that do not maximally load the inferior pole attachment (i.e., avoiding deep knee flexion with active quad pull) can be reintroduced from Stage 2 onward, but it is not a treatment — it is a mobility maintenance activity.
Platelet-rich plasma injections have been investigated for tendinopathy as a way to deliver growth factors to the degenerated tissue. The evidence is mixed. Some randomised controlled trials show benefit over placebo injections; others do not. The quality of evidence is moderate at best, the cost is significant, and access requires specialist referral. PRP is sometimes considered for Stage 2 or 3 tendinopathy where the heavy slow resistance protocol has failed after 12 or more weeks of adherent rehabilitation. It is not a first-line treatment and should not replace the loading programme — even the positive PRP trials require concurrent exercise rehabilitation to produce outcomes.
You know the feeling — every time you push off hard on a split-step, there it is. That dull jab just below the kneecap that you have been ignoring for six weeks. Most players don’t realise that rest alone will not fix a patellar tendon — the collagen is disorganised, not inflamed, and it needs load to remodel. What actually works is progressive heavy loading at the right tempo, done consistently for 8 to 12 weeks.
Return to Padel: Criteria and Progression
VISA-P above 80, no morning stiffness, and plyometric tolerance before full return.
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Frequently Asked Questions
What is the difference between patellar tendinitis and patellar tendinopathy?
Patellar tendinitis implies active inflammation of the patellar tendon. Modern sports medicine research has shown that in established cases the tendon does not contain the inflammatory cells expected in tendinitis — instead it shows disorganised collagen, increased ground substance, and new blood vessel and nerve growth. The correct term is tendinopathy, which describes this degenerative structural change without implying inflammation. The distinction matters for treatment: anti-inflammatory drugs and cortisone have limited benefit in tendinopathy, while progressive loading is the primary intervention.
Where exactly does patellar tendinopathy hurt in padel players?
The pain is located at the inferior pole of the patella — the very bottom tip of the kneecap. This precise location distinguishes patellar tendinopathy from other sources of anterior knee pain. Pain behind or around the kneecap is more likely patellofemoral pain syndrome. Pain just below the tendon itself may be fat pad impingement. If pressing firmly on the bottom tip of the kneecap (with the knee extended and quadriceps relaxed) reproduces your familiar pain, the patellar tendon is the likely source.
Can I keep playing padel with patellar tendinopathy?
In most cases yes, but with significant load reduction and structured management running in parallel. The guideline is that activity should stay below the level that causes next-morning increase in tendon pain. Most players at VISA-P 40 to 80 can play at 40 to 60% of their normal session volume while undertaking the heavy slow resistance programme. Playing at full volume without rehabilitation will progress the tendon through the continuum stages and make recovery progressively harder and longer. If your VISA-P is below 40, suspend padel and focus entirely on the rehabilitation programme until the score improves.
Why should I not get a cortisone injection for my patellar tendon?
Corticosteroid injections directly into the patellar tendon are contraindicated because they are associated with increased tendon rupture risk. Cortisone suppresses the remaining cellular activity in the already compromised tendon, providing short-term pain relief at the cost of further structural weakening. Multiple studies comparing cortisone to exercise rehabilitation show worse long-term outcomes (at 6 and 12 months) in the cortisone group. If a clinician recommends a direct patellar tendon injection, ask specifically about the evidence and consider seeking a second opinion from a sports medicine specialist.
What is the VISA-P score and how do I use it?
The VISA-P (Victorian Institute of Sport Assessment-Patella) is an eight-question self-report scale scored from 0 to 100 that measures patellar tendinopathy severity and function. A score below 40 means you cannot safely participate in court sport. Between 40 and 80, you can participate with load modification while undergoing rehabilitation. Above 80 is the threshold for return to full competitive play. Use it every 2 to 3 weeks during your rehabilitation programme to track progress objectively — it removes guesswork from return-to-play decisions.
How long does patellar tendinopathy take to recover in padel players?
Reactive tendinopathy (acute, less than 2 weeks) can settle within 4 to 6 weeks with appropriate load management. Established tendinopathy (Stage 2 disrepair) requires 8 to 12 weeks of consistent heavy slow resistance training to produce meaningful collagen remodelling. Degenerative tendinopathy (Stage 3, long-standing) may take 4 to 6 months and may not fully resolve structurally — though function and pain can improve significantly with the loading programme. The single biggest predictor of duration is how consistently the exercise programme is completed.
What is the Purdam protocol and how is it different from eccentric exercises?
The Purdam heavy slow resistance (HSR) protocol uses bilateral loaded exercises (leg press, squat, hack squat) performed at a slow, controlled tempo — 3 seconds lowering, 3 seconds raising — at heavy loads (3 sets of 15 reps, 3 times weekly). The previous standard was the Alfredson eccentric decline squat, which involves only the lowering (eccentric) phase. Research comparing the two shows that HSR produces equivalent or better outcomes with significantly better patient compliance, because the eccentric-only protocol is painful to execute and players stop earlier. HSR is now the preferred first-line protocol for established patellar tendinopathy.
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