Hips and Runner's Knee: Does Glute Strength Prevent or Fix Knee Pain?

Ask almost anyone who has had runner's knee what fixed it, and the answer often involves glutes. Clamshells, side-lying leg raises, banded walks and single-leg squats have become the standard prescription for knee pain, and the logic is appealing: if your hips are weak, your knee collapses inwards as you land, the kneecap tracks badly and the knee gets sore. Strengthen the hips and the problem goes away.

Part of that story is well supported. Part of it isn't. This article covers what runner's knee is, what the trials show about hip exercise as a treatment, why the evidence for prevention is much weaker, and how to fit hip and knee strength work into a winter run build.

What runner's knee is

"Runner's knee" usually means patellofemoral pain: pain around or behind the kneecap, typically aggravated by activities that load the knee while it's bent, such as running, squatting, stairs, hills and sitting for long periods. It isn't a structural injury you can see on a scan. It's a pain condition, and its causes are still debated.

It's common. A 2021 systematic review by Kakouris, Yener and Fong in the Journal of Sport and Health Science pooled studies of running-related injuries and found that patellofemoral pain was one of the three conditions with the highest incidence, alongside anterior compartment tendinopathy and Achilles tendinopathy. The knee was among the most frequently injured sites.

Triathletes aren't immune. Winter is often when run volume climbs, hills and off-road routes come back into the plan, and a new gym routine adds squats and lunges. Any of those can be enough to irritate a sensitive knee.

The hip theory

The case for hips rests on a plausible chain of reasoning. When the hip abductors and external rotators are weak, the thigh may drop and rotate inwards during single-leg stance, increasing load on the outside of the kneecap. Cross-sectional studies show that people with patellofemoral pain often do have weaker hips than people without it.

The trouble is that a cross-sectional study can't tell you which came first. Weak hips might cause knee pain. Or knee pain might make people move less, protect the leg and lose hip strength. Answering that needs prospective studies that measure strength first and then see who develops pain.

Does hip weakness predict runner's knee?

The 2014 review

A 2014 systematic review and meta-analysis by Rathleff, Rathleff, Crossley and Barton in the British Journal of Sports Medicine addressed this directly. They found:

• Prospective studies: moderate-to-strong evidence that isometric hip strength was not associated with developing patellofemoral pain.
• Cross-sectional studies: moderate evidence that people who already had patellofemoral pain had weaker hips than pain-free people.
• Adolescents: limited evidence that they didn't show the same hip deficits as adults.

Their interpretation was that reduced hip strength may be a consequence of patellofemoral pain rather than a cause.

The 2019 risk-factor meta-analysis

A larger 2019 meta-analysis by Neal and colleagues, also in the British Journal of Sports Medicine, pooled prospective studies of all potential risk factors. It included 18 studies with 4,818 participants, 483 of whom developed patellofemoral pain (an incidence of about 10%). The studies fell into three groups: military recruits, adolescents and recreational runners.

• Hip weakness was not a risk factor, with moderate evidence and pooled effect sizes close to zero.
• Quadriceps weakness was a risk factor in military recruits, with moderate evidence (standardised mean difference -0.69 when normalised to body mass index).
• In adolescents, higher hip abduction strength was a risk factor, the opposite of what the hip theory would predict.
• Age, height, weight, body mass index, body fat and Q angle were not risk factors.

So the best available prospective evidence doesn't support the idea that weak glutes set you up for runner's knee. If anything, the thigh muscles look more relevant, at least in recruits.

Does hip exercise treat runner's knee?

Here the picture changes. Even if weak hips don't cause patellofemoral pain, strengthening them may still help people who have it.

The 2018 meta-analysis

A 2018 systematic review and meta-analysis by Nascimento and colleagues in the Journal of Orthopaedic and Sports Physical Therapy pooled 14 trials with 673 participants with patellofemoral pain.

• Compared with no training or placebo, hip and knee strengthening reduced pain (mean difference -3.3, 95% CI -5.6 to -1.1) and improved activity (standardised mean difference 1.4).
• Compared with knee strengthening alone, adding hip strengthening reduced pain further (mean difference -1.5, 95% CI -2.3 to -0.8) and improved activity (standardised mean difference 0.7).
• The benefits were maintained beyond the end of the programmes.
• Measured strength didn't change significantly with any of the interventions.

That last finding matters. If people got better without getting measurably stronger, the benefit may come from something other than bigger, stronger glutes: changes in how they move, reduced pain sensitivity with graded loading, or simply the effect of a structured, progressive exercise programme that gets them moving with confidence.

A large randomised trial

A 2015 multicentre trial by Ferber and colleagues in the Journal of Athletic Training randomised 199 patients with patellofemoral pain (66 men and 133 women, mean age 29) across four sites in Canada and the United States to six weeks of either:

• A hip and core protocol, or
• A knee-focused protocol.

Both groups improved substantially in pain and function, and both got stronger. The differences were in the detail:

• Pain fell about a week earlier in the hip and core group.
• The hip and core group gained more hip abductor and hip extensor strength and posterior core endurance.
• Overall outcomes at six weeks were similar.

In other words, both approaches worked. Hip work got there a little faster.

What the consensus recommends

In 2016, an international group of patellofemoral pain researchers led by Crossley published a consensus statement on physical treatments in the British Journal of Sports Medicine. Its main recommendations:

• Exercise therapy is recommended to reduce pain in the short, medium and long term, and to improve function in the medium and long term.
• Combining hip and knee exercises is recommended over knee exercises alone, for pain and function.
• Combined interventions, such as exercise with taping or foot orthoses, are recommended for pain in adults in the short and medium term.
• Foot orthoses were recommended for short-term pain relief only.
• Manual therapy and electrophysical agents were not recommended.

The consensus framed these as recommendations to inform, not standardise, care, alongside individual assessment.

Treatment and prevention are different questions

It's easy to slide from "hip exercise helps people with runner's knee" to "hip exercise stops people getting runner's knee". They are separate claims, tested in different ways, and here they have different answers.

A treatment trial asks whether people who already have pain improve more with one programme than another. The answer for hip plus knee exercise is yes, consistently, across 14 trials. A prevention question asks whether a factor measured before any pain starts predicts who develops it, or whether a programme given to healthy people reduces new cases. For hip strength, the prospective studies say no, and no prevention trial has tested hip exercise on its own.

Inference: one way to reconcile the two is that hip work helps a painful knee by spreading load, building confidence in single-leg movements and giving a structured route back to running, rather than by correcting a weakness that caused the problem in the first place. That's a hypothesis, not something the trials tested. But it explains why the treatment evidence can be strong while the prevention evidence is weak, and why measured strength didn't need to change for people to improve.

Can exercise prevent it at all?

The prevention evidence for hip exercise specifically is thin, but there is one large trial of a mixed programme. Coppack, Etherington and Wills (2011), in the American Journal of Sports Medicine, cluster-randomised 1,502 British army recruits (median age 19.7) in 50 training groups during their 14-week basic training.

• The intervention groups added four lower-limb strengthening and four stretching exercises to their supervised physical training lessons.
• The control groups did the standard warm-up.
• Anterior knee pain developed in 4.8% of controls and 1.3% of the intervention groups, an unadjusted hazard ratio of 0.25.

That's a large effect, but there are important limits. The programme mixed strengthening and stretching, so the contribution of hip exercise can't be separated out. Recruits were young and mostly in male training groups, and they started an abrupt, heavy training load that is very different from a gradual triathlon build. Inference: a simple, regular lower-limb strength routine may help when training load rises sharply, but this can't be read as evidence that hip exercises on their own prevent runner's knee in triathletes.

Who was studied

• Sex: patellofemoral pain trials are one of the few areas of sports medicine where women are well represented. In the Ferber trial, two-thirds of participants were women.
• Age: most participants were in their twenties. Masters athletes, adolescents and older recreational runners are much less studied.
• Population: recruits, adolescents and recreational runners dominate the prevention studies. None of the trials here included triathletes.

Inference: the treatment findings probably transfer reasonably well to adult age-group triathletes with knee pain, because patellofemoral pain doesn't seem to be specific to one sport. The prevention findings transfer less well, because recruits starting basic training face a sudden load spike that most triathletes can avoid.

What this means for your winter build

The following combines the studies above. It's inference for triathletes, not a tested programme:

1. Include hip and knee strength work in your routine anyway. Exercises such as squats, step-ups, split squats, hip thrusts and side-lying or banded hip abduction are reasonable parts of any strength programme. TriForward's "Two Sessions a Week" and "The Off-Season Strength Block" cover the bigger picture.
2. Don't expect glute work alone to prevent knee pain. The prospective evidence doesn't support it. Quadriceps strength may matter more, and load management matters most.
3. Manage run load. Winter builds often add volume, hills and new surfaces at the same time. TriForward's "Forget the 10% Weekly Rule" covers how the size of single-session jumps, not just weekly totals, relates to injury.
4. If your knee starts to hurt, act early. Combined hip and knee exercise is one of the best-supported treatments, and the consensus recommends it as first-line care. A physiotherapist can confirm the diagnosis and tailor the programme.
5. Consider running mechanics alongside strength. TriForward's "Should You Raise Your Cadence?" covers how small increases in step rate reduce load at the knee, and "Switching to a Forefoot Strike Over Winter?" covers why changing footstrike shifts load rather than removing it.
6. Keep the knee programme in the gym when it isn't sore. Exercises that aggravate pain can usually be modified, for example by reducing depth or load, rather than abandoned.

A triathlon scenario

The following example is illustrative, not drawn from a study. A 44-year-old triathlete adds a hilly trail run and a new lunge-heavy gym session to her week in December. By January she has a dull ache around her right kneecap on stairs and in the last few kilometres of runs.

A sensible approach, based on the evidence above, might be:

• Assessment: she sees a physiotherapist, who confirms patellofemoral pain and rules out other causes.
• Load: she drops the trail run and shortens her runs to a distance that doesn't worsen the pain the next day, keeping her cycling and swimming.
• Exercise: she does hip and knee strengthening three times a week, with lunge depth reduced to a pain-tolerable range.
• Progression: over six to eight weeks she rebuilds run volume gradually, reintroducing hills last.

The trials suggest she can expect improvement within weeks, and the Ferber trial hints that the hip component may speed early pain relief.

Common mistakes

• Treating clamshells as knee insurance. The best prospective evidence says hip weakness doesn't predict runner's knee.
• Only doing hip exercises for a sore knee. The trials and consensus support hip and knee exercise together, not hips alone.
• Expecting a strength test to prove it's working. In the meta-analysis, pain and function improved without significant strength changes.
• Running through worsening pain. Pain that increases during runs and is worse the next day is a sign to reduce load and get advice.
• Changing everything at once in winter. New hills, new shoes, new gym exercises and more volume in the same fortnight make it hard to know what caused the problem.
• Forgetting the quads. Quadriceps weakness was a risk factor in military recruits, and knee exercises are part of the recommended treatment.

What we don't know

• Why hip exercise helps if it doesn't need to change measurable strength.
• Whether any exercise programme prevents patellofemoral pain in runners or triathletes. The best prevention trial was in army recruits and mixed strengthening with stretching.
• The ideal dose, frequency and duration of hip and knee exercise for prevention or treatment.
• Masters athletes. Most trial participants were in their twenties.
• Whether cycling volume affects risk. Triathletes load the knee on the bike as well as the run, and no study has looked at patellofemoral pain risk across both. TriForward's "Lifting to Failure? Reps in Reserve for Endurance Athletes" covers how to keep strength sessions from adding unnecessary fatigue to that mix.

References

• Neal BS, Lack SD, Lankhorst NE, Raye A, Morrissey D, van Middelkoop M. Risk factors for patellofemoral pain: a systematic review and meta-analysis. British Journal of Sports Medicine, 2019;53(5):270–281. doi:10.1136/bjsports-2017-098890
• Rathleff MS, Rathleff CR, Crossley KM, Barton CJ. Is hip strength a risk factor for patellofemoral pain? A systematic review and meta-analysis. British Journal of Sports Medicine, 2014;48(14):1088. doi:10.1136/bjsports-2013-093305
• Nascimento LR, Teixeira-Salmela LF, Souza RB, Resende RA. Hip and knee strengthening is more effective than knee strengthening alone for reducing pain and improving activity in individuals with patellofemoral pain: a systematic review with meta-analysis. Journal of Orthopaedic and Sports Physical Therapy, 2018;48(1):19–31. doi:10.2519/jospt.2018.7365
• Ferber R, Bolgla L, Earl-Boehm JE, Emery C, Hamstra-Wright K. Strengthening of the hip and core versus knee muscles for the treatment of patellofemoral pain: a multicenter randomized controlled trial. Journal of Athletic Training, 2015;50(4):366–377. doi:10.4085/1062-6050-49.3.70
• Crossley KM, van Middelkoop M, Callaghan MJ, Collins NJ, Rathleff MS, Barton CJ. 2016 Patellofemoral pain consensus statement from the 4th International Patellofemoral Pain Research Retreat, Manchester. Part 2: Recommended physical interventions (exercise, taping, bracing, foot orthoses and combined interventions). British Journal of Sports Medicine, 2016;50(14):844–852. doi:10.1136/bjsports-2016-096268
• Coppack RJ, Etherington J, Wills AK. The effects of exercise for the prevention of overuse anterior knee pain: a randomized controlled trial. American Journal of Sports Medicine, 2011;39(5):940–948. doi:10.1177/0363546510393269
• Kakouris N, Yener N, Fong DTP. A systematic review of running-related musculoskeletal injuries in runners. Journal of Sport and Health Science, 2021;10(5):513–522. doi:10.1016/j.jshs.2021.04.001