Does exercise really ease hip arthritis pain?
Barely. A new Cochrane review of 18 randomized trials found that exercise for hip osteoarthritis lowered pain by about 7 points on a 100-point scale, which is less than most people can actually feel. Physical function improved by a similar small amount, and quality of life did not really change.
Hip osteoarthritis is what happens when the cartilage cushioning the hip joint wears down. The joint gets painful and stiff, and walking, stairs, and getting out of a chair all get harder. Nearly every international treatment guideline recommends exercise as the first thing to try. This review, an update of work first published in 2009, asked a simple question: how well does that advice actually hold up?
The answer is more complicated than the guidelines suggest. Exercise does something. It just does less than most patients are led to expect.
What the data show
The review pooled 18 trials with 1,368 adults who had hip osteoarthritis. About 63% were women, and most were between 53 and 74 years old. All the exercise was land-based, so no pool programs. The researchers converted every result onto the same 0 to 100 scale so the trials could be compared directly.
The clearest comparison was exercise versus no treatment, usual care, or a bit of education. Across 9 trials with 449 people, exercise reduced pain by 7.19 points out of 100. The true effect is very likely somewhere between about 4 and 11 points lower (95% confidence interval 3.68 to 10.70 points). That sounds decent until you learn that people generally need a change of roughly 12 points before they notice a difference in daily life. Even the best-case end of that range falls short.
Physical function followed the same pattern. Exercise improved it by 8.79 points out of 100, very likely between about 5 and 12 points (95% confidence interval 5.41 to 12.00). Quality of life barely moved at all, improving by 2.31 points, and the range was wide enough to include no benefit whatsoever (95% confidence interval 1.15 points worse to 5.91 points better).
Dr. Kumar’s Take
I have recommended exercise to hip arthritis patients for years, and I am not going to stop. But this review made me rethink how I talk about it.
The part that got my attention was the placebo comparison. When exercise was tested against a sham or attention control, something designed to give patients the same time, attention, and expectation of getting better without the actual exercise, the pain benefit shrank and became unreliable. Pain fell by 6.31 points, but the true effect could plausibly be anywhere from a meaningful 13-point drop to nothing at all (95% confidence interval 12.98 points better to 0.35 points worse). That gap between the two comparisons tells me a real chunk of what patients feel from an exercise program comes from being seen, being coached, and expecting improvement.
That is not a reason to skip exercise. Attention and expectation are real parts of care. But I would rather tell a patient the honest version, that exercise is worth doing for reasons beyond the hip, than promise pain relief that the evidence cannot deliver.
Quality of the evidence
Most of these 18 trials were small and unblinded, meaning participants knew which group they were in. That matters a lot when the main outcome is self-reported pain. Cochrane rated the evidence for the no-treatment comparison as moderate certainty, which is reasonably solid. The placebo comparison rested on only 2 studies with 123 people between them and earned a low certainty rating.
There is also a third comparison worth knowing about. Seven trials with 751 people tested adding exercise on top of another treatment, versus that treatment alone. Adding exercise probably did little to nothing for pain, function, or quality of life. Pain dropped 3.86 points and function 2.37 points, and both ranges included the possibility of no benefit.
Where exercise still earns its place
The safety data were reassuring in the most practical setting. When exercise was added to another treatment, it lowered the risk of side effects by about 25% (relative risk 0.75), a finding very likely to be real (95% confidence interval 3% to 42% lower) across 6 studies and 731 people. Exercise did not push people out of the trials either. Withdrawal rates were about the same whether people exercised or not.
One small trial did report more adverse events with exercise compared with a sham treatment (relative risk 8.00), but that came from a single study of 18 people and Cochrane graded it very low certainty. That is a signal too weak to act on.
Hip arthritis rarely travels alone. The same people usually carry risks for heart disease, diabetes, and cognitive decline, and exercise has strong evidence behind it for all three. A 7-point pain drop may not be much on its own. Bundled with everything else exercise does, and at essentially no cost, it still belongs near the front of the treatment plan.
Practical takeaways
- Expect modest pain relief from an exercise program for hip osteoarthritis, roughly 7 points on a 100-point scale, and treat anything beyond that as a bonus rather than the goal.
- Keep exercising anyway, since the safety profile is good and the whole-body benefits for heart, metabolism, and brain health are far better established than the hip-specific ones.
- If exercise is your only treatment and your pain has not improved after a few months, bring that to your doctor rather than assuming you are doing it wrong, because the average benefit here is truly small.
- Do not let a disappointing exercise trial talk you out of other options, since this review only tested exercise and says nothing about how well medication, injections, or surgery might work for you.
Related studies and research
- Placebos helped older adults even when they knew the pill was fake
- Four minutes of daily exercise improves mobility in older adults
- Lifestyle changes protected the brain, but only in adults under 70
- Creatine and cognitive function: a systematic review
FAQs
Does this mean physical therapy for hip arthritis is a waste of money?
Not necessarily, but it does change what you should expect from it. The trials in this review tested exercise itself, not the full package a good physical therapist provides, which includes assessment, technique correction, pacing advice, and adjustments when something hurts. What the review does suggest is that if you are paying for many months of sessions purely to reduce hip pain, the average return on that is small. A reasonable middle path is a shorter block of supervised sessions to learn the movements properly, then continuing on your own.
Why did exercise look better against no treatment than against a placebo?
Because the two comparisons measure different things. Against no treatment, the result includes everything that comes with joining an exercise program, the movement itself plus the attention, the routine, and the belief that you are doing something useful. A placebo or attention control strips out the exercise but keeps the rest. When the benefit shrinks under that stricter test, it points to a large share of the effect coming from those surrounding factors rather than from the loading and strengthening of the joint.
Would a different type or dose of exercise work better?
This review cannot answer that. It deliberately excluded trials that compared one form of exercise against another, so it says nothing about whether strength training beats walking, or whether more sessions per week helps more. It also excluded water-based programs, exercise done around hip surgery, and programs using vibration or gait retraining. Those are real gaps, and they leave open the possibility that a specific approach outperforms the pooled average seen here.
Bottom line
This updated Cochrane review of 18 trials and 1,368 people found that land-based exercise produces small improvements in hip osteoarthritis pain and function, around 7 to 9 points on a 100-point scale, which most patients will not notice in daily life. Quality of life did not meaningfully change, adding exercise to another treatment did little, and the benefit weakened further when tested against a placebo. Exercise is still safe, cheap, and good for the rest of your body, so it remains a sensible first step. It is just not the powerful pain treatment the guidelines can make it sound like.
