Diagnosis and symptoms6 min read
Jumper's knee: what is pain below the kneecap?
Patellar tendinopathy is irritation of the tendon connecting the kneecap to the shin bone from repetitive loading. Common in sports involving jumping and sudden stops, it is also known as jumper's knee.
Typical symptoms
Pain is felt just below the kneecap at a point limited enough to indicate with a finger. Pressing there reproduces the familiar pain.
Pain easing with warm-up is the most characteristic feature. An athlete can play comfortably once warm, with pain returning hours later or the next morning.
Jumping, sudden stops and changing direction are the most typical triggers. Stiffness on rising after prolonged sitting is also frequently reported.
Why it develops
Tendon strengthens by adapting to the load placed on it. When load exceeds the rate of adaptation, tissue repair falls behind and irritation begins.
A sudden increase in load is the most common cause: training volume rising quickly at the start of a season, returning to a heavy programme after a long break, or starting a new sport unprepared.
Inadequate hip and quadriceps strength increases load on the tendon. Most of the load falling on a single structure during jumping and landing sets up this picture.
Diagnosis and differentiation
Diagnosis rests on history and examination. Point tenderness over the tendon together with pain easing on warm-up is quite directive.
Imaging is usually unnecessary. Ultrasound and MRI can show tendon changes, but these findings occur in pain-free athletes too.
In patellofemoral pain, symptoms are around the kneecap and increase with prolonged sitting; in tendinopathy they are point-like and over the tendon. The distinction is clear on examination.
Key points
- Pain is point-like just below the kneecap.
- Easing with warm-up is the most characteristic feature.
- Pain returns after activity or the next morning.
- A sudden increase in load is the most common cause.
- Imaging findings occur in pain-free athletes too.
Frequently asked questions
Tendinitis or tendinopathy?
The current term is tendinopathy. 'Tendinitis' implies inflammation, whereas the dominant finding in chronic cases is change in tendon structure rather than inflammation. This distinction affects treatment choice.
Is rest enough?
It is not, and used alone it prolongs the picture. Tendon strengthens through loading; complete rest lowers capacity and the picture recurs on return.
Does it cause lasting damage?
Most patients recover fully with an appropriate programme. Continuing to load it untreated deepens the structural change and prolongs the process.
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This content is for information only and does not replace medical diagnosis or treatment. Response to treatment varies between individuals. Please consult a healthcare professional about your symptoms.