Knee

What Actually Prevents Runner's Knee and Jumper's Knee: The Evidence on Load, Landing and the Overworked Tendons

Most overuse knee pain is a load problem, not a structure problem. Here is what the research says about patellofemoral pain, the patellar tendon, the iliotibial band and the rest of the overworked knee, including the popular interventions that do not hold up.

Written by Dr Isa Waheed, MBBS MFSEM

Published 7 September 2026Last reviewed 7 September 202613 min read38 studies reviewed

If your knee hurts and you did not injure it, you are in this article. Patellofemoral pain, patellar and quadriceps tendinopathy, iliotibial band syndrome, an irritated fat pad, a grumbling popliteus: these are the conditions of a knee that has been asked to do more than it was prepared for. They are extremely common, they rarely show anything dramatic on a scan, and the evidence on preventing them points in one consistent direction.

This is the second of four detailed guides under our knee hub. It covers the overloaded knee. The degenerative knee guide, the sports knee injury guide and the young athletes guide each cover their own ground, and we point to them where the stories meet.

Key takeaways

Running technique retraining to land more softly is the best-supported preventive measure for patellofemoral pain, cutting knee injury risk by roughly two thirds in trials, though with low certainty.
Weak quadriceps is the most consistent prospective risk factor for patellofemoral pain. Weak hips are usually a consequence of the pain, not a cause of it.
Patellar tendinopathy is driven by load. Each extra match set per week nearly quadrupled the odds in young volleyball players, and no anatomical factor comes close.
Tendon change on ultrasound raises the risk of future symptoms three to fourfold even when the tendon does not hurt.
Iliotibial band syndrome tracks how the hip and knee move during running, especially knee internal rotation and hip adduction. Overpronation is not the cause.
Stretching, foot orthoses, shoes prescribed by foot shape and generic conditioning have not been shown to prevent any of these conditions.

How common the overloaded knee is

Patellofemoral pain has a reported annual prevalence of around 22.7% in the general population and 28.9% in adolescents, with point prevalence reaching about 22.7% in female adolescent athletes, and a substantial proportion of people have persistent rather than self-limiting symptoms [1]. Among elite athletes, patellar tendinopathy affects around 14% overall, rising to about 45% in volleyball and 32% in basketball and being essentially absent in low-impact sports, is roughly twice as common in men as women, and symptoms often last two to three years [2]. Iliotibial band syndrome incidence in runners is estimated at 5 to 14% [3].

These are not rare conditions. Between them they account for a large share of everything a sports medicine clinic sees.

Patellofemoral pain: what the trials show

This is the one place in the overloaded knee where randomised evidence exists, and it is worth reading closely because it overturns several habits.

Pooling 13 trials, patellofemoral braces worn during activity reduced the risk of patellofemoral pain (RR 0.40) and running retraining to land more softly reduced it further (RR 0.21). Both findings were low certainty, equating to a 60 to 79% reduction. Multicomponent strengthening or neuromuscular programmes (RR 0.49), foot orthoses (RR 0.63), static stretching and intensity-progressed running did not significantly reduce risk [4].

A second review of 30 trials in novice and recreational runners reached the same conclusion from a different direction. Softer-landing retraining cut knee injury risk by about two thirds (RR 0.32), while footwear options, multicomponent exercise therapy, graduated running programmes and injury-prevention education did not reduce risk [5]. For runners who already had patellofemoral pain, retraining, medial-wedge orthoses, exercise therapy and osteopathic manipulation all reduced short-term pain [5], which is a reminder that what prevents a problem and what treats it are not always the same list.

The Cochrane review of running-injury prevention found patellofemoral braces reduced anterior knee pain (RR 0.41), no evidence that stretching (RR 0.85) or a general conditioning programme (RR 1.20) reduced injuries, no benefit from shoes prescribed by foot shape, and limited evidence that reducing running duration or frequency lowered injuries [6].

Strengthening deserves a fair hearing. In 1,502 UK army recruits, a simple programme of four strengthening and four stretching exercises over 14 weeks reduced anterior knee pain from 4.8% in controls to 1.3% in the intervention group, a 75% reduction (HR 0.25), with fewer medical discharges (0.4% versus 3.4%) [7]. Pooled with other exercise trials, however, the overall effect was not statistically significant [7]. Equipment-free neuromuscular warm-up programmes also significantly reduced anterior knee pain in military recruits (RR 0.27), with effective programmes combining stretching, strengthening, balance, agility and landing drills applied for more than three months [8].

The honest reading is that gait retraining and bracing have the clearest signal, structured strengthening helps in the single best trial but not when pooled, and stretching alone, orthoses for prevention and shoe prescription do not hold up.

Patellofemoral pain: who gets it

Across 18 prospective studies and 4,818 people, there was strong to moderate evidence that age, height, weight, BMI, body fat and Q angle were not risk factors for patellofemoral pain [9]. Quadriceps weakness was a risk factor in military recruits (SMD -0.69), hip weakness was not a risk factor overall, and in adolescents greater hip abduction strength was associated with higher risk (SMD 0.71) [9].

That last finding is counterintuitive and worth pausing on. A great deal of patellofemoral advice rests on the idea that weak hips cause the problem. Prospectively, they do not. In 77 female novice runners, baseline strength of every hip muscle group was no different between those who did and did not develop patellofemoral pain over a 10-week programme, so hip weakness did not predict onset and is likely a consequence rather than a cause [10]. The quadriceps is a different story: weaker knee-extension strength was a consistent prospective risk factor, with peak extension torque adjusted for body weight lower in those who went on to develop it [11].

Running mechanics sit in the middle. There was limited evidence that greater peak hip adduction during running preceded patellofemoral pain and iliotibial band syndrome in female runners, though not in mixed-sex cross-country runners, and loading-rate findings were inconsistent [12].

Patellar tendinopathy: a load condition

Jumper's knee is the clearest example in the knee of a condition that follows load rather than anatomy.

In non-elite athletes, jumping sports carried far higher prevalence than low-impact sports, men were affected about twice as often as women, and affected athletes tended to be taller and heavier [13]. Over four years in young elite volleyball players, each extra hour of weekly training raised the risk of developing jumper's knee (OR 1.72) and each extra match set per week was the strongest predictor of all (OR 3.88), young males had three to four times the risk of females, and body composition was not associated with who developed it [14].

A systematic review found a lack of strong evidence for any single modifiable risk factor. The factors most consistently associated were higher body weight (effect size 0.36), greater activity volume (0.22) and greater countermovement jump height (0.31), with limited or conflicting evidence for reduced ankle dorsiflexion, reduced thigh and quadriceps flexibility, and jump-training volume [15]. That effect sizes this small are the best available tells you the condition is not being driven by a fixable anatomical fault. It is being driven by how much high-intensity jumping the tendon is asked to absorb.

One thing does predict trouble before it hurts. A hypoechoic area on ultrasound at baseline raised the risk of developing jumper's knee more than threefold (OR 3.3) [16], and pooled data show asymptomatic tendon abnormality carries around a fourfold higher risk (RR 4.35), though a normal scan does not guarantee safety [17]. Structural change comes first, symptoms follow.

Patellar tendinopathy: what builds a tendon that copes

Progressive resistance loading is the best-supported way to build tendon capacity, with heavy slow resistance training having greater evidence than isolated eccentric exercise and being associated with genuine tendon adaptation, and both approaches improving symptoms [18]. A later review agreed that heavy slow resistance and eccentric-concentric loading are both reasonable choices and that isolating the eccentric component is not necessary [19].

For athletes who need to keep playing, isometric quadriceps holds reduced patellar tendon pain immediately and for at least 45 minutes, by more than isotonic exercise, without losing strength [20], and a second trial confirmed they help athletes keep training in-season [21]. This is about managing load rather than removing it.

The classic review of jumper's knee made the point decades ago: extrinsic factors, chiefly the sport and training methods, outweigh intrinsic anatomical factors, most cases affect the patellar tendon's attachment to the kneecap, around 65%, and elastic kneecap guards and straps have negligible preventive effect [22].

Quadriceps tendinopathy: the under-studied tendon

Most studies of jumper's knee do not separate out the quadriceps tendon, so quadriceps-specific risk factors and treatment are largely inferred from the wider extensor-mechanism literature [23]. In that literature the patellar tendon insertion accounts for about 65% of cases, the quadriceps tendon for about 25%, and the lower attachment for about 10% [22].

What is known fits the load story. In volleyball, players at the highest level had more than three times the extensor-tendinopathy prevalence of lower-level players, with high training volume the primary explanation and reduced quadriceps flexibility also more common [24]. Across a season in which knee problems affected 75% of elite male volleyball players, none of vertical jump, ankle dorsiflexion range, dynamic balance, knee alignment or landing mechanics predicted who developed jumper's knee, with odds ratios all close to one [25]. Biomechanics did not predict it. Load did.

Quadriceps tendon disease also shares the systemic risk factors of tendon disease broadly. Up to a third of extensor-mechanism ruptures have antecedent tendinopathy or cortisone injections, or systemic risks such as obesity, diabetes, chronic kidney disease, hyperparathyroidism and fluoroquinolone use, and these are commoner when both sides are affected [26]. Tendon rupture itself is covered in our sports knee injury guide.

Iliotibial band syndrome: a movement pattern, not a tight band

There are no trials proving how to prevent iliotibial band syndrome, and the evidence on its causes is limited and conflicting, with what exists pointing to running style and hip-knee coordination as central and hip strengthening and advice on shoes and surfaces as reasonable measures [3].

The kinematic evidence is more consistent than that summary suggests. Female runners who went on to develop the syndrome showed greater peak hip adduction and greater knee internal rotation at baseline than controls, with no differences in rearfoot eversion, knee flexion or joint moments [27]. Pooling the literature, there was strong evidence of higher peak knee internal rotation and moderate evidence of greater peak hip adduction, lower peak rearfoot eversion and lower knee flexion at heel strike in runners with the syndrome, which argues against overpronation as a cause [28]. Runners with current symptoms also showed increased trunk lean towards the affected side [29].

The syndrome is about twice as common in female runners, and female runners with current symptoms showed lower isometric hip abductor strength and altered transverse-plane hip motion, but these features appeared in those with current injury rather than as established predictors, and they differed between the sexes [30]. Hip abductor strengthening is more clearly linked to this condition than to other running injuries, but as with patellofemoral pain, weakness may be partly a consequence rather than purely a cause.

Two smaller structures that get blamed

The infrapatellar fat pad is richly innervated and a genuine source of anterior knee pain when inflamed, scarred or pinched, with burning or aching pain reproduced by compression in full extension or hyperextension, and common triggers are direct or repetitive trauma, impingement and prior surgery [31]. But fat pad changes on MRI are frequently seen in people with no pain, so imaging alone does not establish causation, and the pad can be drawn into problems that start in the patellar tendon, meniscus or ligaments [32]. In osteoarthritic knees, a stiffer fat pad on ultrasound was strongly associated with anterior knee pain independent of joint-space severity [33].

The popliteus, at the back and outside of the knee, is most commonly an overuse injury from repetitive rotational and braking loads such as downhill running and twisting of the bent knee in sport or dance, can also follow acute external-rotation trauma, and eccentric quadriceps strengthening is suggested on expert opinion [34]. Dancers with popliteus tendinitis had a deeper bony groove for the tendon, while rotational alignment did not differ [35]. The evidence here is thin, and we say so.

The kneeling knee

Prepatellar bursitis, the swelling over the front of the kneecap known as housemaid's knee, is an overload condition of a different kind. Floor layers spent over half their working time kneeling, and the prevalence of knee complaints and clinically detected bursitis rose with the amount of kneeling, independent of age, body weight, smoking and sporting activity, with bursitis appearing relatively early in a kneeling career [36]. Infection accounts for around a third of inflammatory bursitis at this site and Staphylococcus aureus causes about 80% of those infections, so prevention rests on reducing kneeling and front-of-knee pressure with knee pads, standing tools and breaks, and on protecting the skin [37]. A break in the skin over the kneecap is the usual route to infected bursitis, so kneeling on rough or dirty surfaces raises risk, and immune-impairing conditions such as diabetes predispose [38].

What changes your risk in the overloaded knee

Factor	Condition	Direction	Effect	Can you change it?	Evidence
Softer-landing running retraining	Patellofemoral pain	Lowers risk	RR 0.21 to 0.32	Yes	Tier 1
Patellofemoral brace during activity	Patellofemoral pain	Lowers risk	RR 0.40 to 0.41	Yes	Tier 1
Structured strengthening programme	Patellofemoral pain	Lowers risk in best trial	HR 0.25 in recruits; pooled not significant	Yes	Tier 1
Weak quadriceps	Patellofemoral pain	Raises risk	SMD -0.69 in recruits	Yes	Tier 2
Weak hips (as a cause)	Patellofemoral pain	No effect on onset	Did not predict; likely a consequence	-	Tier 2
Age, height, weight, BMI, Q angle	Patellofemoral pain	No effect	Not risk factors	-	Tier 2
Static stretching	Patellofemoral pain	No effect	RR 0.85; not significant	-	Tier 1
Foot orthoses (for prevention)	Patellofemoral pain	No effect	RR 0.63; not significant	-	Tier 1
Match and training load	Patellar tendinopathy	Raises risk	Each extra match set per week OR 3.88	Yes	Tier 2
Tendon change on ultrasound	Patellar tendinopathy	Raises risk	OR 3.3 to RR 4.35	No	Tier 2
Progressive heavy slow resistance loading	Patellar tendinopathy	Builds capacity	Genuine tendon adaptation	Yes	Tier 2
In-season isometric holds	Patellar tendinopathy	Reduces pain	At least 45 minutes; no strength loss	Yes	Tier 1
Elastic guards and straps	Patellar tendinopathy	No effect	Negligible	-	Tier 3
Knee internal rotation and hip adduction in running	Iliotibial band syndrome	Raises risk	Strong and moderate evidence	Partly	Tier 2
Overpronation	Iliotibial band syndrome	No effect	Rearfoot eversion lower, not higher	-	Tier 2
Occupational kneeling	Prepatellar bursitis	Raises risk	Rises with kneeling time	Yes	Tier 3

Where the evidence runs thin

The patellofemoral trials are mostly in military recruits doing arduous training, and how far they transfer to a recreational runner is a fair question. The gait retraining and bracing findings are low certainty. Almost everything on the tendons and the iliotibial band is cohort or cross-sectional, which means it can tell us who tends to get these conditions but is weaker on what stops them. The fat pad and popliteus literature is small. And for the tendons, no study has yet shown that any single modifiable factor, changed in advance, prevents the condition. What the load evidence gives us is a strong, consistent direction rather than a proven intervention.

What we would actually do

Manage load, especially spikes in high-intensity jumping and match play, because that is the one factor that shows up everywhere. Train the quadriceps, which is the muscle group the prospective evidence actually implicates. If you run and get front-of-knee pain, work on landing more softly before you buy anything. Load your tendons progressively with heavy slow resistance and use isometric holds to get through a season rather than stopping. Do not expect stretching, orthoses or a strap to prevent any of this. If you kneel for a living, use pads and protect your skin. And treat a painless tendon that shows change on ultrasound as a warning worth respecting.

References

Frequently asked questions

Should I stretch to prevent runner's knee?

The evidence says no. In the Cochrane review stretching did not reduce running injuries (RR 0.85), and in a pooled analysis of 13 trials static stretching did not significantly reduce patellofemoral pain. Running retraining to land more softly and a patellofemoral brace during activity are the two measures with a real signal.

Do I need orthotics to prevent knee pain?

Not for prevention. Foot orthoses did not significantly reduce patellofemoral pain risk (RR 0.63), and shoes prescribed by foot shape did not reduce injuries. Medial-wedge orthoses did reduce short-term pain in runners who already had patellofemoral pain, which is a different question.

Is jumper's knee caused by tight or weak muscles?

Not in any way the evidence can pin down. No single modifiable factor has strong support, body composition did not predict who developed it, and flexibility findings are limited and conflicting. The strongest predictor by far is load: each extra match set per week nearly quadrupled the odds in young volleyball players.

Is iliotibial band syndrome caused by overpronation?

No. Pooled evidence shows runners with the syndrome have lower rearfoot eversion, not higher. The consistent features are greater knee internal rotation and greater hip adduction during running, which is a hip-knee coordination pattern rather than a foot problem.

Can I keep training with a painful patellar tendon?

In trials, isometric quadriceps holds reduced patellar tendon pain for at least 45 minutes without any loss of strength and helped athletes keep training through a season. That is educational information rather than advice for your knee; persistent tendon pain is worth having assessed.

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About the author

Dr Isa Waheed

MBBSMFSEMBSc (Hons)DipMSKDipExMedDipTCPGCertFHEA

NHS doctor and sport and exercise medicine clinician, translating injury prevention research into guidance people can act on.

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Educational information only. Not medical advice and not a substitute for assessment by a qualified clinician. Seek prompt medical assessment for a knee that locks, gives way, swells significantly, or cannot bear weight, or for any sudden or severe knee injury.