Exercise therapy for hip osteoarthritis: what the evidence shows

Why this question is worth asking carefully

If your hip aches when you rise from a chair, stiffens after a long drive, or nags at you through a walk that used to be easy, you have plenty of company. Hip osteoarthritis is one of the most common causes of persistent hip pain in older adults, and "keep moving" is advice most people with it hear early and often. It sounds reasonable — but it fairly prompts the question: does exercise actually help an arthritic hip, or is it just the healthy-living advice everyone gets? Researchers have studied this, and the honest answer sits between the two easy stories. It is neither a cure nor a placebo. This piece lays out what the best current evidence found, how confident researchers are in it, how durable the effect seems, and one point that matters here more than most: the hip has been studied far less than the knee, so some of what we can say with confidence about the knee simply isn't settled for the hip yet. We're not here to sell you on exercise or to talk you out of it — only to show the evidence as it stands so you can have a better conversation with a regulated health professional.

What hip osteoarthritis actually is

Osteoarthritis is a degenerative joint disease in which the tissues of the joint break down over time [1]. It isn't only "worn-out cartilage": the changes can involve the cartilage capping the ends of the bones, along with the underlying bone, the synovial lining, and the surrounding ligaments and tendons [1]. In the hip — a deep ball-and-socket joint that carries much of your body weight — those changes commonly show up as pain in the groin, thigh, or buttock, stiffness that tends to ease within about half an hour of getting moving, and a gradual loss of range and function that can make stairs, socks, and long walks harder [1].

It is also common, though not the single most affected joint. The World Health Organization estimates that about 528 million people worldwide were living with osteoarthritis in 2019; the knee is the most frequently affected joint, at roughly 365 million people, followed by the hip and then the hand [2]. Osteoarthritis is a major contributor to disability, and a large share of those affected have moderate-to-severe symptoms [2]. Importantly, there is no treatment that reverses the underlying joint changes — care focuses on managing symptoms and maintaining function [1][2]. That is exactly why non-drug options like exercise draw so much attention: they are aimed at how you feel and what you can do, not at undoing the arthritis itself.

What the evidence shows

The most relevant high-quality synthesis is a Cochrane systematic review by Fransen and colleagues, which pooled the randomized trials of land-based exercise for hip osteoarthritis [3]. Cochrane reviews sit at the top tier of evidence because of how carefully they assess each trial and grade overall confidence. The comparison in this review is straightforward: people given a structured exercise programme versus people who were not.

Pain and function, immediately after the programme. Across nine trials with 549 participants, exercise reduced pain by a standardized mean difference of −0.38 (95% CI −0.55 to −0.20), which the reviewers translated to roughly 8 points lower on a 0–100 pain scale (95% CI about 4 to 11 points) [3]. Self-reported physical function improved by a similar standardized amount (SMD −0.38, 95% CI −0.54 to −0.05), or about 7 points on a 0–100 scale (95% CI about 1 to 12) [3]. Cochrane rated the certainty of both results as high [3].

Here is the part a careful reader shouldn't skip, because it is easy to misread. "High-quality evidence" describes how confident researchers are that the measured effect is about right — not that the effect is large. The effect here is modest: roughly 8 points on a 100-point scale for pain. That sits at or below the change many researchers consider the smallest a person is likely to actually notice. A separate 2023 systematic review and cumulative meta-analysis reached the same numeric ballpark (pain SMD −0.38, function around −0.31) and put the interpretation plainly: the effect of exercise for hip osteoarthritis is real but "small and not clearly clinically worthwhile" [4]. In other words, the evidence is consistent and fairly firm that exercise helps a little; it does not show that it helps a lot.

Quality of life. Unlike pain and function, broader quality-of-life scores did not show a clear benefit. Pooling three small trials (183 participants), the estimate was close to no difference (SMD roughly −0.07), and Cochrane graded that evidence low-certainty [3]. This is an honest gap rather than a strong negative finding — but it means the case for exercise here rests mainly on pain and function, not on a demonstrated lift in overall quality of life.

How long it lasts. This is where the hip evidence looks encouraging. When outcomes were measured three to six months after programmes ended, the benefit largely held: about 8 points for pain (95% CI roughly 4 to 12) and about 7 points for function (95% CI roughly 4 to 13) on the 0–100 scale, across five trials [3]. That durability is worth noting, though it comes with a caveat — many of these programmes encouraged people to keep exercising, and guideline reviewers emphasize that benefits tend to build with continued activity rather than persist automatically after you stop [7].

Safety. In the trials that tracked it, no injuries or serious adverse events attributable to exercise were reported [3]. That said, relatively few of the hip trials formally monitored harms, so this is best read as reassuring rather than exhaustive — it is common to feel some added joint or muscle soreness when starting, which typically settles [3][7].

How it's studied — and why the hip is a harder case than the knee

Three features of this research should temper how firmly anyone reads the numbers — and the first is specific to the hip.

• The hip evidence base is much smaller than the knee's. The Cochrane hip review pooled about 10 trials and a few hundred people; the companion Cochrane review for knee osteoarthritis pooled 139 trials and more than 12,000. Fewer, smaller trials mean less ability to detect differences between types of exercise, to study longer-term outcomes in depth, or to look at subgroups. Guideline panels themselves note that considerably more evidence supports exercise for the knee and hip than for other joints, but within that, the hip has been studied far less than the knee [6]. So the confident, granular picture available for the knee is simply thinner for the hip.
• The hip trials compared exercise against no exercise — not against a placebo. In a drug trial you can hand out an identical dummy pill. You cannot make someone unaware they've been assigned to a strengthening or walking programme, and the hip review compared exercise mainly with non-exercise groups [3]. That leaves open how much of the measured 8-point improvement is the exercise itself versus the attention, encouragement, and expectation that come with any supervised programme. The knee literature has begun to tease those apart with "attention-control" comparisons; the hip literature largely has not, so this remains a real uncertainty here [3].
• "Exercise" is not one thing, and adherence varies. The trials bundled strengthening, aerobic and walking programmes, and other approaches at different intensities and doses, and there isn't enough evidence to say any single type clearly outperforms another [3][6]. Benefits also depend on people actually doing the exercise over time, which real life makes uneven.

What the guidelines say

Given a modest and somewhat uncertain effect, you might expect cautious guidance. Instead, major clinical guidelines recommend exercise for hip osteoarthritis firmly and consistently:

• The Osteoarthritis Research Society International (OARSI) 2019 guidelines designate structured land-based exercise as a Core Treatment for hip osteoarthritis — a foundational recommendation for essentially everyone, alongside education [5].
• The American College of Rheumatology / Arthritis Foundation 2019 guideline strongly recommends exercise for hip osteoarthritis, citing a strong body of literature supporting its use for almost all patients [6].
• The UK's National Institute for Health and Care Excellence (NICE) 2022 guideline advises clinicians to "offer therapeutic exercise tailored to their needs" to all people with osteoarthritis, giving muscle strengthening and general aerobic fitness as examples, and notes that benefits tend to grow with continued, long-term activity [7].

Why land firmly on exercise when the measured effect is modest? Because guideline panels weigh more than a single effect size. They factor in that osteoarthritis has no cure and no low-risk option that reverses it, that exercise is comparatively safe and inexpensive, that it carries broad benefits for the heart, weight, and general health, and that it is a reasonable first-line step before or alongside medication or joint-replacement surgery [1][2][5][6][7]. A recommendation "for almost all patients" is a judgment about the overall balance of benefits, harms, and alternatives — not a claim that exercise produces a large or guaranteed change in any one person's hip. Reading it as the latter would overstate what the trials actually measured.

What this means for you

If you're living with hip osteoarthritis, a fair summary is this: the best current evidence suggests exercise probably improves pain and function, the effect is genuine but modest and may sit close to the threshold of what you'd clearly notice, the benefit for pain and function appears to hold for several months when activity continues, a clear quality-of-life benefit hasn't been shown, the risks are generally minor, and clinical guidelines still recommend it as a core, first-line option [3][4][5][6][7]. It's also fair to say the hip has been studied less thoroughly than the knee, so some questions — including how much of the benefit is the exercise itself — remain more open here [3]. None of that is a promise of relief, and none of it is a substitute for a proper assessment of your hip.

The right next step is a conversation with a licensed, regulated health professional — your physician, a physiotherapist, or another qualified clinician — who can examine your specific situation, rule out problems that need different care, and help you decide what kind of exercise, at what dose, makes sense for you, and how it fits alongside your other options. That individualized judgment is something the research averages alone cannot provide.