“A few shockwave sessions will fix the knee pain.” Many patients troubled by knee osteoarthritis have heard this. Shockwave therapy (extracorporeal shockwave therapy, abbreviated ESWT) has become quite common in clinics and in physiotherapy in recent years, but the practical question people care about most is: is it worth paying for? The answer is not a simple yes or no. The key lies in how it is positioned. This article looks at it from the medical evidence. The most suitable role for shockwave is as an accelerator for an exercise programme, and not as a stand-alone treatment that can deal with knee osteoarthritis on its own.
The most common misunderstanding is to think that exercise is not needed once shockwave has been done. This idea easily leads to wasted money and misplaced expectations. Even if shockwave works, it cannot replace strengthening of the muscles around the knee and weight loss, which are the core of treatment with the most medical evidence. Treating shockwave as a shortcut that avoids exercise is often why patients later feel it was not worth it.
How medical research assesses shockwave for knee osteoarthritis
Start with the positive data. A systematic review and pooled analysis published in the medical journal Pain Medicine (Wang 2020) combined the results of several randomised controlled trials and found that the pain relief and functional improvement of extracorporeal shockwave therapy for knee osteoarthritis can last up to 12 months, with mild side effects. This ability to last for a year is something many traditional passive therapies struggle to match, and it is the main reason shockwave attracts attention.
The other side of the coin must also be stated honestly. Apart from the positive data of a single pooled analysis, the overall clinical evidence is in fact quite mixed. The energy levels, number of sessions and frequency used in different studies vary greatly, so the research community finds it hard to settle on a common standard. There is also still no high-quality, long-term clinical trial, so shockwave has still not been listed as a standard treatment by mainstream clinical guidelines. This does not mean shockwave does not work. The current evidence is simply not yet firm enough for international guidelines to recommend it without reservation.
Why a single study and international guidelines reach different conclusions
Many patients may be puzzled. If a pooled analysis shows it works, why do the clinical guidelines not recommend it? Is someone wrong? In fact, both conclusions are correct, and each answers a different level of question. A pooled analysis asks whether, on average across the combined data of the studies, there is an improvement. A clinical guideline asks whether the evidence is currently firm enough to be formally recommended to the general public, and the bar for that is naturally much higher.
- Pain relief and functional improvement can last up to 12 months
- Mild side effects and generally safe
- Conclusion: worth trying as an add-on alongside an exercise programme
- Mixed trial quality and differing energy settings
- No high-quality long-term evidence, and not listed as a standard treatment by mainstream guidelines
- Conclusion: should not be treated as a must-do or as a course on its own
Putting the two views together, the most practical understanding is this: shockwave is not “useless”, but it is not “proven beyond doubt” either. Its position is in a grey area: it can be tried and is worth trying, but expectations must be kept realistic and its effect should not be exaggerated. Once this is understood, a patient will not easily be led along by promotions of a few sessions to settle everything, and will not dismiss its value as a supporting measure because the guidelines do not recommend it.
Where shockwave fits in a treatment plan
Since the medical evidence shows both its potential and its limits, the best way to use shockwave is to treat it as an accelerator for an exercise programme and not as the main treatment. In concrete terms, shockwave is used early in the course to bring pain down first and lower the knee’s resistance to movement, so that the patient is more able and more willing to take on the strength training and weight-bearing activity that really improve the course of the condition.
Before deciding on shockwave, first ask one question: is there an exercise programme to go with it? If the provider only sells a package of shockwave sessions and never mentions how strength training and daily activity will follow, be careful. What is bought this way may be only short-term pain relief and not a complete plan that really improves knee osteoarthritis.
Which patients may consider shockwave
There is no standard answer to whether shockwave is worth doing. The key depends on the patient’s own expectations and willingness to exercise. The situations below can serve as a guide:
- People who are willing and able to keep up strength training of the knee, and only want to ease the pain at the start so it is easier to begin. In this case shockwave can be considered as a supporting tool.
- People who are afraid to move because of joint pain and have fallen into the cycle of the more it hurts, the less they move, and the less they move, the weaker the muscles become. These patients can use shockwave to reduce pain first and then follow straight on with exercise training, which makes it more worthwhile.
- People who understand that shockwave is only one part of the whole rehabilitation plan and accept that exercise must be relied on afterwards to maintain the effect. With this attitude, the expected effect is more easily achieved.
- People who expect shockwave alone to settle the problem once and for all and have no plan to make time for exercise. These patients are mostly disappointed, and this approach does not match the current medical evidence.
- People who want to use shockwave as a shortcut to skip strength training and weight loss. We do not advise this, and it is not a direction supported by mainstream clinical guidelines.
For how other passive supporting therapies besides shockwave should be combined with exercise, and for the wider approach to treating knee osteoarthritis from the ground up, see the overview of physiotherapy for knee osteoarthritis.
Research evidence on shockwave and its limits
Whether a course is worthwhile often cannot be judged until it is finished. Judging from how much it hurts today is unreliable, because pain from osteoarthritis comes and goes by itself, and a change over a day or two cannot show whether the course is working or the condition is simply fluctuating. Home physiotherapy picks concrete, observable everyday movements as the baseline, such as going up and down stairs, squatting and walking distance, and measures the same set of movements again from time to time. Whether recovery is steadily going up or standing still then becomes plain to see.