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What is the patellar tendon?
It connects the kneecap to the shin bone and transfers quadriceps force to straighten the knee. It works during standing from a chair, running and jumping. In fast movements the tendon also helps store and release energy, a little like a spring, although it is not a simple mechanical object.
Tendinopathy means load-related tendon pain with reduced ability to manage effort. It is broader than “tendinitis”, which suggests only inflammation. Pain below the kneecap can have other causes, particularly in a growing teenager.
Chapter sources [1]
Understand the picture
From muscle to shin bone
Quadriceps
It produces force to straighten the knee.
Kneecap
It helps transfer this force.
Patellar tendon
It connects kneecap to shin bone and receives the load.
Chapter sources [1]
Which symptoms should you describe?
Pain is often fairly localised near the lower edge of the kneecap or along the tendon. Jumping, landing, acceleration and some strength exercises may provoke it. The start of a session may be painful, then become more comfortable, followed by a response later or the next day.
This pattern does not prove that the tendon can tolerate any load. Describe session frequency, the provoking movement and the delayed response. More widespread pain around the kneecap may be patellofemoral pain. The professional distinguishes these situations rather than choosing treatment from the location alone.
What can contribute to the problem?
An increase in jumps, matches or closely spaced sessions may exceed the tendon’s current capacity. Returning after a break and adding strength work and sport together are situations to explore. Available recovery and muscle capacity also form part of assessment.
There is not always an obvious mistake. A trained person can develop tendinopathy, and pain does not directly measure training quality. The aim is to understand total load: sport, work, stairs and exercises add up. One exercise presented as corrective will not necessarily address the whole situation.
What does the professional check?
Assessment considers the history, location and tasks that load the tendon. It may include strength, squatting and, where appropriate, faster movements. You do not need to repeatedly provoke severe pain to demonstrate the problem.
Ultrasound or MRI may help in some situations, particularly when the diagnosis is uncertain or another injury is suspected. Tendon changes can exist without pain. Imaging therefore needs to be related to examination; it does not alone determine exercise level or a recovery date.
When should you stop and seek prompt assessment?
Sudden pain with a snapping sound, sudden difficulty actively straightening the knee or difficulty walking after effort needs urgent assessment. Do not assume this is simply the usual tendinopathy. A rupture or another injury may need investigation according to the circumstances.
A hot, red and markedly swollen knee, especially with fever, needs advice the same day. Pain that clearly worsens or changes character also deserves review. In an emergency in Luxembourg, call 112; do not complete an exercise session before seeking help.
Why adjust load rather than only rest?
Temporarily reducing the most provoking efforts may settle symptoms. However, to return to jumping, the tendon and muscles then need to regain the required capacity. A replacement activity may maintain some fitness if tolerated and compatible with the assessment.
The aim is not to remove every sensation at any cost. It is to avoid lasting worsening while progressing. Your plan should identify which efforts continue, which change and what response is acceptable. Adding a competition counts as load, not an invisible exception.
Which exercises are used?
Work may begin with held contractions or slow movements, depending on tolerance. It progresses towards more demanding strengthening, then efforts that store and release energy, such as gradual jumping tasks. The final stage prepares the actual movements of the sport.
A clinical trial supported individualised load progression in the population studied. This does not show that one protocol suits everyone. Isometric holds do not relieve pain in everyone, and eccentric exercise is not automatically superior. Load, recovery and progression matter as much as the name of the contraction.
Chapter sources [2]
In everyday life
From strengthening to jumping
Find a tolerated load
Start with manageable resistance and movement.
Build capacity
Gradually increase effort with enough recovery.
Prepare for sport
Reintroduce fast, repeated movements before full return.
Chapter sources [2]
Which dose and limits should you follow?
The dose depends on strength, current sensitivity and other activities. Your physiotherapist should specify resistance, repetitions, frequency and recovery. The small introductory dose on the Exercises page is not a complete programme for a tendon that needs to return to repeated jumps.
Observe symptoms during exercise, afterwards and the next day. If the response becomes stronger or lasts longer, reduce one variable and review the situation. New swelling, loss of function or sudden pain means stopping and seeking assessment. You do not need substantial pain to make exercise effective.
Work, training and sleep: plan a realistic week
A job involving stairs or squatting may make a planned session harder. Spread demanding tasks out where possible and allow recovery. For an athlete, team training, strength work and matches need discussion together. A short but very intense session is not necessarily a small load.
For sleep, choose a comfortable position; no pillow repairs the tendon. Report night pain that becomes unusual, persists at rest or comes with other signs. A simple diary can record activities and the next day’s response without requiring you to monitor the knee every minute.
How do you decide on return and when to reassess?
Recovery may take several months, especially with longstanding symptoms. It is not just a matter of waiting. Before full return, assess the ability to repeat the sport’s movements, strength, confidence and the response after sessions.
Return may progress through individual drills, partial training and then more participation. Agree on criteria with your professional. If the programme brings no useful progress, review the diagnosis, dose and recovery. Injections or surgery are not automatic next steps; their value and limitations need specialist discussion.
Chapter sources [2]
Your questions
Can I play if pain disappears after warming up?
This temporary improvement is not enough. The amount of jumping and the response afterwards or the next day matter. Follow the agreed plan rather than treating the warm-up as automatic clearance.
Chapter sources [2]
Must I squat on a decline board?
No. This exercise can load the tendon heavily and is not suitable at every stage. A variation and resistance chosen with your physiotherapist are more useful than copying a protocol without assessment.
Chapter sources [2]
Does a strap below the kneecap heal the tendon?
It may change sensations in some people but does not replace load progression. Check comfort and usefulness during a specific activity. It should not hide worsening so that you can continue without adjustment.
Chapter sources [1]
Does an abnormal scan mean I must stop sport?
Not on its own. Examination, symptoms and abilities guide the decision. An acute injury or suspected rupture changes the situation and needs prompt assessment.
Chapter sources [2]
Sources and references
- [1] NHS BNSSG — Patellar tendinopathy : symptoms, load and exercises
- [2] Breda et al. — Progressive tendon-loading exercise trial (2021)
- [3] HAS — Pertinence de l’imagerie en cas de gonalgie chez l’adulte
- [4] Assurance Maladie — Douleurs du genou : que faire et quand consulter ?
- [5] AAOS — Anterior cruciate ligament injuries
- [6] CGDIS — 112 Luxembourg
- [7] AAOS — Patellar tendon tear
Text updated on
Medical review: awaiting Hasib Selimovic.