Joint Injections for Dogs: Types, Evidence and Risks | New Zealand Guide

That last detail is where most articles on this subject go wrong, and it matters if you are trying to compare your options honestly. Below is what the peer-reviewed veterinary literature actually reports for each injection: how big the studies were, what they measured, how long the effect lasted, and where the evidence runs out.

How safe are joint injections in dogs?

This is the best-answered question in the whole topic, and the answer is reassuring. A retrospective review at Cornell University Hospital for Animals covering 505 joint injections across 283 visits in 178 client-owned dogs between 2010 and 2022 found (Miller et al., JAVMA 2023, PMID 36595365): For an older dog whose nutrition plan also includes eye support, review eye supplements and what canine research supports before adding another antioxidant formula with overlapping ingredients.

• Transient soreness in 18.4% of visits, median duration 2 days (range 1-20 days).
• Gastroenteritis in 6.8%.
• Septic arthritis in 1 of 505 joints (0.2%) - the only potential major complication recorded. If collagen is one of the joint-support ingredients you are comparing, use the collagen comparison by type and dose to distinguish peptides from undenatured type II.
• Soreness was not related to how many joints were injected in one visit. Larger injectate volumes relative to body size caused more soreness in the stifle and tarsus, and stem cells were the only injectate with significantly increased odds of soreness.

The authors' conclusion: therapeutic joint injections in dogs are safe, with an extremely low risk of major adverse effects. What they are not is a home procedure - arthrocentesis and intra-articular injection require sterile technique and usually sedation or general anaesthesia, often with ultrasound guidance.

The seven injection types, and what the evidence shows

1. Corticosteroids (methylprednisolone, triamcinolone)

The oldest and cheapest option, used off-label in dogs. A systematic review of 35 in vivo animal studies found that the four canine studies identified reported beneficial effects, while rabbit and equine work showed cartilage damage tied to frequent or high-dose administration - the authors state plainly that animal studies "have not yet provided definitive data" (Vandeweerd et al., Fundam Clin Pharmacol 2015, PMID 26211421). There is no blinded, force-plate-controlled trial of intra-articular corticosteroid alone in dogs with naturally occurring osteoarthritis. Frequency is the variable your vet will be most careful about. For a closer look at the question raised here, read Best Melatonin for Dogs with Alopecia: What the Only Placebo-Controlled Trial Found | New Zealand Guide.

2. Hyaluronic acid (viscosupplementation)

Moderate evidence, from small trials. In 16 dogs with hip dysplasia-associated osteoarthritis followed for 90 days, the hyaluronic acid group scored better on the Canine Brief Pain Inventory from day 15 onward than dogs given saline plus conservative care (Carapeba et al., 2016, PMID 27847523). More surprisingly, in a 48-week double-blind randomised trial, high-molecular-weight hyaluronic acid outperformed allogeneic stem cells on objective body weight distribution at weeks 24 and 36 (Kim et al., Front Vet Sci 2022, PMID 35747237). If you are researching the oral version of this molecule, see our guide to hyaluronic acid for dogs. Considering CBD as another part of a comfort plan? The CBD oil comparison lets you compare mg per mL and testing details before discussing a product with your veterinarian.

3. Platelet-rich plasma (PRP) and Arthrex ACP

The most-studied regenerative option, and the one with the clearest expiry date. A 2025 systematic review pooled 18 studies and 379 dogs: all reported significant improvement, but 8 carried a high risk of bias, only 7 used objective gait analysis, and 8 never reported platelet concentration (Cardona-Ramirez et al., JAVMA 2025, PMID 40912277). The cleanest single trial randomised 20 client-owned dogs against a sedated saline control and measured a 12% increase in peak vertical force at 12 weeks, with no change in controls (Fahie et al., JAVMA 2013, PMID 24134578). The expiry date comes from a force-plate study in 12 dogs where gait gains peaked within the first three months and had returned to near baseline by six months (Vilar et al., PLoS One 2018, PMID 29554150).

4. Autologous protein solution / IRAP (Pro-Stride)

Blood-derived, anti-inflammatory, and one of the few with a blinded placebo trial using force plates. In 21 client-owned dogs, a single injection produced a 14.9% improvement in peak vertical force at 12 weeks; saline controls improved on owner scores at week 2 but showed no force-plate change at all (Wanstrath et al., Vet Surg 2016, PMID 27391909). A later randomised trial in hip osteoarthritis found owner-reported improvement and a drop in analgesic use from 14 dogs to 5 over six months - but no objective difference between the protein solution and hyaluronic acid plus triamcinolone (Franklin et al., 2021, PMID 34395580). The authors of that study own the research company; that is worth knowing.

5. Stem cell therapy

The most heavily marketed and the least convincing on objective measures. The best-designed canine trial randomised 68 dogs with elbow osteoarthritis to umbilical-cord stem cells or saline. Owner-reported success reached 46% versus 14% at six months - but peak vertical force did not change in either group (Kim et al., Front Vet Sci 2019, PMID 31921927). A frequently quoted 130-dog study reporting 88% improvement had no control group and no blinding (Zeira et al., 2018, PMID 30035380). Self-limiting joint flares are common: 5 of 22 joints after a first injection, and in almost all dogs after a repeat (Cabon et al., 2019, PMID 30805348). The separate guide, 2026 Pet Owner Study: The 5 Best-Rated Hip & Joint Supplements for Dogs | New Zealand Guide, explains the choices in more detail.

6. Polyacrylamide hydrogel (Arthramid Vet, 2.5% iPAAG)

Promising, but the canine data is a survey rather than a trial. Of 100 responding owners covering 150 injections, 82 rated their dog somewhat or much better, 44% of dogs on analgesics reduced or stopped them, and adverse events - mostly injection-site soreness - occurred in 10% (Barnhard et al., JAVMA 2026, PMID 40997901). The response rate was 52%, there was no control group, and one author works for the manufacturer. The paper's own conclusion asks for controlled prospective studies. In the US it is regulated as a device, not an approved drug.

7. Tin-117m radiosynoviorthesis (Synovetin OA)

A single injection of a radioactive colloid that stays inside the joint capsule and quiets the inflamed synovium. In 23 dogs with grade 1-2 elbow osteoarthritis, peak vertical force improved at 3 and 9 months in the high-dose (2.5 mCi) group only, with no adverse effects reported (Aulakh et al., 2021, PMID 34113552). In 14 dogs with advanced grade 3 elbow disease, owner-assessed success exceeded 70% at every checkpoint across a year, without a placebo group (Donecker et al., PLoS One 2021, PMID 34280212). Every pivotal study was funded by the manufacturer, and the evidence is almost entirely about the elbow. Treatment is restricted to radiation-licensed centres. The separate guide, Elbow Dysplasia in Dogs: Signs, Treatment & Joint Care | New Zealand Guide, explains the choices in more detail.

Adequan is not a joint injection - and that changes the comparison

The one thing nobody tells you: owners see improvement that force plates don't

Across these trials a pattern repeats. Owner questionnaires improve; objective gait measures often don't. Saline-injected control dogs improved on owner scores at week 2 in the Pro-Stride trial with zero force-plate change (Wanstrath 2016). Placebo dogs in the stem cell trial hit 14-28% "success" on the same owner instrument used to declare the treatment effective (Kim 2019). Your dog gets a car ride, sedation, rest and a lot of attention - and you are watching for improvement.

This is not a reason to avoid injections. It is a reason to ask your vet for an objective baseline, to expect any single modality to do less than the brochure implies, and to be sceptical of before-and-after videos.

Which injection for which dog?

Real-world practice matches this. In a survey of 174 veterinary practitioners, 164 performed intra-articular injections, the elbow was the most commonly injected joint, PRP and viscosupplements were the most used, and 40% combined viscosupplements with corticosteroids (Sepulveda et al., Front Vet Sci 2026, PMID 41756585). For the comparison criteria behind this choice, see Joint Infiltration in dogs: local veterinary authority guide and evidence | New Zealand Guide.

Where daily joint nutrition fits

To be precise about what that is and isn't: these are daily nutritional supplements intended to support normal joint function and mobility. They do not treat osteoarthritis, and no published evidence shows an oral supplement improves the result of an injection. They are the part of the plan you control at home. If you want the full landscape first, start with our guide to the best joint supplements for dogs, or compare the drug options in dog arthritis medicine. If glucosamine is on the shortlist for joint support, the glucosamine buying guide helps you check form, daily amount and overlapping ingredients before choosing a bottle or chew. For the comparison criteria behind this choice, see When to Start Joint Supplements for Dogs: Age & Signs | New Zealand Guide. For a closer look at the question raised here, read Joint Supplements for Labradors: What Works & When to Start | New Zealand Guide.

When to call your vet immediately

• A hot, swollen joint, fever, or sudden severe lameness after an injection - septic arthritis is rare (0.2%) but is an emergency.
• Soreness lasting beyond a few days, or worsening rather than settling.
• Sudden non-weight-bearing lameness in any dog, injected or not.
• Lameness in a young dog, which may point to dysplasia, OCD or cruciate disease rather than age-related arthritis.
• Any dog whose current arthritis plan has stopped working. A supplement is not a substitute for a diagnosis - start with dog limping if you are not sure what you are seeing.

Frequently asked questions

How much do joint injections for dogs cost?

Cost varies widely by modality, region and whether sedation and imaging are included, and no published dataset gives a reliable national figure. Corticosteroid and hyaluronic acid injections are at the low end; PRP, protein solution, hydrogel, stem cells and radiosynoviorthesis are progressively more expensive because of the preparation, equipment or licensing involved. Ask your practice for a written estimate that includes sedation.

How long do joint injections last in dogs?

It depends on the injectate. PRP gait improvements peaked within three months and had returned to near baseline by six months in one force-plate study (Vilar 2018). Protein solution trials followed dogs for six months. Tin-117m radiosynoviorthesis is described as lasting up to twelve months after a single injection in the elbow. Corticosteroid and hyaluronic acid effects are generally shorter.

Are joint injections safe for dogs?

The largest safety dataset - 505 injections in 178 dogs - recorded transient soreness in 18.4% of visits with a median duration of two days, gastroenteritis in 6.8%, and one case of septic arthritis in 505 joints. The authors concluded the procedure is safe with an extremely low risk of major adverse effects (Miller 2023).

Can my dog have joint supplements as well as injections?

Veterinary pain management is explicitly multimodal, and daily nutritional support is commonly used alongside veterinary treatment. What no verified evidence shows is that a supplement improves the outcome of an injection - so treat it as long-term background support, not as a booster or a replacement, and tell your vet everything your dog is taking.

Is Adequan an intra-articular joint injection?