Jumper's Knee – The Tendon That Needs Load, Not Rest

Jumper's knee typically affects athletes in volleyball, basketball, handball and athletics – sports involving a great deal of jumping and landing. The condition is notorious for becoming long-standing, and one important reason is that it's often treated with the opposite of what the tendon needs: rest.

What happens in the patellar tendon

The patellar tendon runs from the kneecap down to the shin bone, transmitting force from the thigh muscles every time you extend the knee. In jumper's knee, a tendon disorder (tendinopathy) typically develops at the very top of the tendon, just below the kneecap.

The pain is characteristically localised – most people can point to a single spot with a fingertip – and comes primarily with loading that demands explosive force: jumping, landing, deep squats and downhill running. Early in the course the tendon tends to hurt during warm-up, improve through the session, and ache afterwards. It's a pattern that often tempts athletes into carrying on as before.

Why rest alone doesn't work

Tendons need mechanical loading to maintain and rebuild their structure. With complete rest, pain typically subsides temporarily, but the tendon's load tolerance falls at the same time. When training then resumes at the previous level, the athlete meets a tendon that tolerates less than it did when the problem arose – and symptoms return, often worse.

Treatment is therefore not about removing load, but about managing it: reducing the provocative peaks (jumping and landing) for a period, while building the tendon's capacity with controlled strength training.

What the research says about training type

Eccentric training – lowering into a squat on a decline board – was long regarded as the gold standard. More recent research has nuanced that picture.

A systematic review and network meta-analysis published in Heliyon in 2024 compared eccentric training, isometric training and heavy slow resistance training. The analysis found that eccentric training alone performed worst, while isometric training and moderate to heavy slow resistance training produced better results. The authors also note that heavy slow resistance may have advantages for long-term knee function.

In practice this means progressive heavy, slow strength training – often combined with isometric holds when the tendon is irritable – stands on firmer ground than the purely eccentric protocols that dominated previously. Isometric holds have an additional useful property: they often provide immediate pain relief, which can be used strategically before a match or training session.

Phase-adapted progression

Loading must follow the state of the tendon, not a fixed weekly plan:

• Irritable phase: isometric holds for pain relief, temporary reduction of jump and landing volume, but strength work maintained
• Building phase: heavy slow resistance training for the knee extensors with gradually increasing load, 2–3 sessions per week
• Energy storage phase: gradual reintroduction of fast, springy movements the tendon must tolerate in sport
• Return to sport: full jump and landing load, with objective strength and jump criteria before unrestricted participation

The role of clinical examination and ultrasound

Pain at the front of the knee isn't automatically jumper's knee. Patellofemoral pain syndrome, Osgood-Schlatter in adolescents, fat pad irritation (Hoffa's fat pad), and problems in the quadriceps tendon produce overlapping symptoms but require different approaches and follow different timelines.

Clinical examination with precise palpation and loading tests localises the problem. Ultrasound shows the tendon directly: thickening, disrupted fibre structure and vascular ingrowth are typical findings in tendinopathy. Equally important, ultrasound findings must be interpreted with caution – structural changes in the patellar tendon are also found in athletes with no pain whatsoever. Findings should therefore always be weighed against the clinical picture, never interpreted in isolation.

Sources

1. Li Y, Sun D, Fang Y, Lu Z, Shi F, Liu G, Gu Y. "Mixed comparison of intervention with eccentric, isometric, and heavy slow resistance for Victorian Institute of Sport Assessment Patella Questionnaire in adults with patellar tendinopathy: A systematic review and network meta-analysis." Heliyon 2024;10(21):e39171.