⚠️ When to Seek Medical Help
This comes first because it is the part that is time-sensitive.
Get medical assessment the same day if you have:
- Fever, chills, or feeling generally unwell — with or without joint symptoms
- Increasing heat, redness or swelling at the treated site, especially if it is spreading
- Pain that is getting worse rather than better, particularly after the first 48 hours
- A joint that becomes hot, very painful and difficult to move
- Any discharge from the injection site
Heat and redness at an injection site, with worsening pain, can indicate an infection in or around the joint. Joint infection is treated as an emergency because delay causes permanent damage. Do not wait to see whether rest helps.
Go to an emergency department or call emergency services if you have:
- Pain, swelling, warmth or tenderness in one calf or leg — this can indicate a deep vein thrombosis
- Sudden breathlessness, chest pain, or coughing up blood — this can indicate a pulmonary embolism
- Sudden loss of function in the treated limb, or new weakness or numbness
⚠️ Why this matters particularly if you travelled for treatment. Long-haul flights, recent procedures and reduced activity each raise the risk of blood clots, and a treatment trip combines all three — a flight out, a procedure, a quieter fortnight, and a flight home. This is why the early stage below emphasises walking, ankle pumps and hydration rather than complete rest. Move little and often, stay hydrated, and get up and walk during flights.
Where to go
Contact local medical care — your own doctor, an urgent care service, or an emergency department. Do not wait to reach the clinic that treated you, particularly if you have travelled home and they are in another time zone. Tell whoever sees you what treatment you had, where, when, and into which joint — take your discharge paperwork with you.
Let the treating clinic know afterwards, so it goes on your record. But they are not the first call for a suspected infection or clot.
Normal, and not a cause for concern
- Mild muscle fatigue after activity
- Some stiffness that eases as you move
- A sense of exertion
- Mild soreness at the site for a day or two
What Exercise Actually Does
It is worth being clear about the order of things here, because it is usually presented backwards.
For knee and hip osteoarthritis, exercise is first-line treatment. The most recent Cochrane review of exercise for knee osteoarthritis — updated in 2024 — found low-certainty evidence that exercise may produce a slight improvement in pain immediately after the programme ends, a mean 8.70 points better on a 0–100 scale, with the reviewers judging the benefits to be of uncertain clinical importance. [1]A parallel review found similar, small benefits for hip osteoarthritis. [2]
That is a weaker claim than the earlier edition of the same review supported, and it is stated here at the lower strength deliberately. It cuts in two directions at once: it is a real, honestly measured effect from something that is free and carries almost no risk — and it is not a large one. Both the American College of Rheumatology and OARSI still recommend exercise as a core, first-line intervention for knee and hip osteoarthritis. [3][4]It remains better evidenced than anything sold for these conditions, which is a statement about the rest of the field as much as about exercise.
For chronic musculoskeletal pain more broadly, a Cochrane overview of 21 reviews found physical activity and exercise generally improved pain severity and physical function, with variable quality of evidence and few adverse effects reported. [5]
So exercise is not an adjunct to your treatment. It is the intervention with the best evidence, and it continues to be that afterwards. The purpose of a staged return is simply to avoid aggravating a recently injected joint on the way back to it.
What we do and do not know about exercise and injected cells
Mesenchymal stromal cells respond to their local environment, including mechanical signals — this is well described in laboratory work. [7]Strenuous exercise also produces short-term inflammatory cytokine and reactive-oxygen-species responses in skeletal muscle. [8][9]
Those are two separate, real findings, and joining them is speculation. No study has tested whether exercising sooner or later after an injection changes the outcome, in either direction. The staged return below is caution based on ordinary practice, not evidence that early activity harms results — and it should not be presented as either a guarantee or a warning.
The Staged Return
⚠️ These are stages, not dates. The week ranges are conventional starting points used in ordinary post-injection practice; they are not derived from any trial, and no study has established a schedule for this treatment. Progress when the previous stage feels comfortable, and step back if a joint becomes more sore for more than a day. Your treating clinician's specific advice overrides anything here.
Stage 1 — Settling (roughly the first one to two weeks)
Aim: let the joint settle, while staying mobile enough to protect your circulation.
Do:
- Walking, short and frequent — several brief walks beat one long one
- Ankle pumps and calf raises regularly, including on flights — these matter for circulation
- Gentle range-of-motion movement within comfort
- Stay well hydrated
Hold off on:
- Impact activity — running, jumping, court sports
- Heavy or maximal lifting
- Anything that leaves the joint more sore the next day
⚠️ Do not interpret "settling" as bed rest. Complete inactivity is not the goal and carries its own risks. If you have been given specific weight-bearing or movement restrictions by the clinician who treated you, follow those instead.
Stage 2 — Gentle movement (roughly weeks three to four)
Aim: restore normal movement without loading the joint hard.
Do:
- Longer walks, building gradually
- Modified yoga or tai chi
- Swimming and pool walking, once any puncture site is fully closed and dry
- Normal light daily activity
Hold off on:
- Running and jogging
- Weight training
- High-impact classes
Stage 3 — Building (roughly weeks five to eight)
Aim: rebuild strength and endurance.
Do:
- Walking 30–45 minutes
- Stationary cycling at low resistance
- Bodyweight resistance work
- Gentle Pilates
- Swimming
How to progress: start at about half your previous intensity and increase by roughly 10% per week. Both figures are conventional rules of thumb for graded return — they are sensible and widely used, and they are not trial-derived.
Stage 4 — Returning to full activity (usually from around three months)
Aim: get back to what you actually want to do.
Running, higher-impact sport, heavier resistance training and interval work are usually reintroduced from around this point — but this is the stage where individual variation matters most, and it should be discussed with a clinician who can examine the joint, particularly for spine, shoulder, and any joint that is still symptomatic.
There is no fixed date. Anyone giving you one for a specific sport has not examined you.
Notes by Treated Area
⚠️ These are general principles, not schedules. The differences between regions reflect ordinary rehabilitation practice, not comparative evidence.
Knee — walking and ankle pumps early; stationary cycling without resistance and pool walking as it settles; progressive cycling and hiking before any return to running. Straight-leg raises and partial wall sits are useful early strength work.
Hip — walking with support if needed; supine and side-lying work early; pool exercise and gentle hip mobility as it settles; progressive walking and cycling before loaded work.
Shoulder — pendulum exercises and passive range of motion first; active range of motion before resistance; light bands before strengthening; overhead loading last.
Spine — walking early, with gentle core activation; swimming as it settles; progressive core strengthening and light lifting later. ⚠️ New or worsening leg pain, numbness, weakness, or any change in bladder or bowel control needs urgent assessment, not exercise modification.
Building a Sustainable Routine
The FITT framework
FITT — Frequency, Intensity, Time, Type — is a standard exercise-prescription framework used by the American College of Sports Medicine. [10]It is a way of structuring progression, not a schedule for this treatment.
- Frequency: start around 3 days a week, build toward 5–6
- Intensity: start low — you can hold a conversation — and build to moderate
- Time: start with 10–15 minutes, build toward 30–60
- Type: cardiovascular base first, add strength, keep flexibility throughout
For general health, WHO recommends 150–300 minutes of moderate or 75–150 minutes of vigorous activity weekly, plus muscle-strengthening on two or more days, and notes that some activity is better than none at any age. [6]
Activities that suit this stage well
Pool and aquatic work — buoyancy reduces joint load while providing resistance in every direction; particularly useful early.
Yoga and tai chi — flexibility, balance and stress reduction; modify positions as needed.
Pilates — controlled movement and core strength.
Modifications
For joint conditions — favour low-impact: water, cycling and elliptical work before treadmill or road running.
For inflammatory or autoimmune conditions — prioritise consistency over intensity, and be alert to overexertion triggering a flare.
For respiratory conditions — build aerobic conditioning gradually, use pursed-lip breathing, and avoid exercising in poor air quality.
Working With Professionals
A physiotherapist is the single most useful person to involve. They can examine the joint, correct form, progress you appropriately and tell you when something is not settling as it should. If you take one thing from this page beyond the warning signs, it is this.
If you work with a personal trainer, choose someone with post-rehabilitation experience, tell them exactly what treatment you had and where, and be specific about limitations.
FAQs
When can I go back to the gym?
Light work generally once you are comfortably through the building stage; fuller routines later. We are deliberately not giving you a week number — nobody has studied this, and your joint's response is better information than a calendar.
Can I do yoga?
Gentle and restorative work early, regular classes as the joint settles. Hot yoga adds heat and dehydration to the picture, so leave it until you are back to full activity.
What about golf or tennis?
Partial, controlled swings before full ones; full play before competitive play. Rotational sport loads the spine, hips and shoulders substantially, so progress it deliberately.
Will exercise damage the injected cells?
Nobody knows, and anyone who tells you otherwise is going beyond the evidence. No study has compared earlier with later return to activity after this treatment. The staged approach here is ordinary caution, not a demonstrated requirement.
How do I know if I am overdoing it?
Increased pain, swelling or fatigue that has not settled within about 24 hours means the last step was too big. Step back a stage — that is information, not failure. If pain is worsening rather than simply slow to settle, see the warning signs above.
Can I work with a trainer?
Yes. A physiotherapist first if the joint is still symptomatic.