A painful knee, shoulder or hip can make even ordinary movements feel carefully calculated. When physiotherapy, activity modification and simple pain relief have not provided enough improvement, patients often ask about cortisone vs PRP injections. Both can have a place in orthopaedic care, but they work in very different ways. The appropriate choice depends on the source of pain, the condition of the joint or tendon, your health history and what you hope treatment will achieve.
An injection should not be treated as a generic solution for pain. A careful assessment, often supported by imaging where appropriate, helps identify whether symptoms are arising from arthritis, inflammation, a tendon injury, bursitis, a meniscal problem or another structural issue. That diagnosis matters more than the name of the injection.
Cortisone vs PRP injections: the key difference
Cortisone, also called corticosteroid, is a strong anti-inflammatory medicine. It is usually combined with a local anaesthetic and injected into a joint, bursa or around certain soft-tissue structures. Its purpose is to settle inflammation and reduce pain, sometimes quite quickly.
Platelet-rich plasma, or PRP, is prepared from a sample of your own blood. The blood is processed to concentrate platelets and other biological components, then injected into the area being treated. Platelets contain signalling proteins involved in the body’s healing response. PRP is intended to support tissue recovery rather than simply suppress inflammation.
This distinction is useful, but it should not be overstated. PRP is not a guaranteed method of regrowing cartilage or repairing every tendon problem. Equally, cortisone is not inherently harmful when used carefully for the right condition. Each treatment has benefits, limitations and situations where it is less suitable.
When a cortisone injection may be considered
Cortisone injections can be particularly helpful when inflammation is a major driver of symptoms. Examples may include a painful arthritic knee with swelling, shoulder bursitis, an inflammatory flare around a joint, or pain that is preventing a patient from participating in rehabilitation.
For some people, the relief begins within days, although the response is variable. It may last weeks or months, and occasionally longer. A successful injection can create a valuable window to restore movement, improve muscle strength and return to a tailored physiotherapy programme. In this setting, the injection is part of a broader treatment plan, not the entire plan.
Cortisone may also be considered when prompt symptom control is important. A patient struggling to sleep because of severe shoulder pain, for example, may need pain settled enough to engage with rehabilitation and daily activities with greater confidence.
However, cortisone does not reverse osteoarthritis or correct a torn tendon, unstable joint or significant mechanical problem. Repeated injections into the same area require careful consideration. While occasional, appropriately placed injections are commonly used, frequent corticosteroid exposure may affect local tissues and can be associated with cartilage concerns in some joints.
A cortisone injection can temporarily raise blood glucose levels, which is particularly relevant for patients with diabetes. Other potential risks include post-injection pain flare, skin thinning or colour change at the injection site, infection and, in certain circumstances, tendon weakening. Steroid should generally not be injected directly into particular tendons because of rupture risk.
Timing also matters for patients considering joint replacement. A recent steroid injection into a joint may influence the recommended timing of surgery because surgeons aim to minimise infection risk. This should be discussed openly during consultation rather than assumed to be a barrier or a reason to delay needed care.
When PRP may be considered
PRP is often discussed for chronic tendon conditions and selected joint problems, particularly where symptoms have persisted despite well-directed rehabilitation. It may be considered for some cases of tennis elbow, patellar tendinopathy, Achilles tendon symptoms, rotator cuff-related pain or mild to moderate knee osteoarthritis.
The appeal is understandable: PRP uses your own blood components and is intended to encourage a healing response. Yet the evidence is not equally strong across all conditions. PRP preparation methods differ between clinics, as do injection techniques, treatment schedules and the severity of conditions studied. This makes it difficult to promise a uniform result.
For knee osteoarthritis, some patients experience meaningful improvement in pain and function after PRP, particularly when disease is not advanced. Others notice little benefit. PRP cannot replace cartilage that has been substantially worn away, correct severe deformity or eliminate the need for joint replacement when arthritis has progressed to the point that the joint is no longer functioning well.
PRP is also not usually a quick fix. It can cause temporary soreness or swelling after the procedure, and improvement may take several weeks or months. Rehabilitation remains important. The aim is to use the period of reduced symptoms or improved function to build strength, address movement patterns and support the joint or tendon over the longer term.
Because PRP is commonly provided as a private treatment, out-of-pocket cost is another practical consideration. Medicare and private health insurance coverage may be limited or unavailable depending on the indication and provider. Patients deserve clear information about expected costs, uncertainty of benefit and alternative treatments before proceeding.
Which option is better for knee, shoulder or tendon pain?
There is no universal winner in cortisone vs PRP injections. The better choice depends on the diagnosis and treatment objective.
For an acutely inflamed shoulder bursa or a painful arthritic flare, cortisone may offer more predictable short-term symptom relief. For a persistent tendon condition where inflammation is no longer the primary issue, a structured loading programme remains central to care, and PRP may be discussed in selected cases. For established bone-on-bone arthritis with major restriction in walking, sleep and independence, neither injection may provide a durable answer. A discussion about joint replacement or other surgical options may be more appropriate.
Age alone should not decide treatment. An active 70-year-old with early knee arthritis may have different goals and treatment options from a 35-year-old worker with a tendon injury, even if both describe similar pain. Work demands, sport, previous treatment, medical conditions, imaging findings and willingness to undertake rehabilitation all deserve consideration.
Why accurate diagnosis and technique matter
An injection can only be as useful as the diagnosis behind it. Pain felt in the hip may come from the hip joint, lower back, surrounding tendons or referred pain from elsewhere. Shoulder pain may reflect bursitis, arthritis, a rotator cuff problem, neck-related symptoms or instability. Treating the wrong structure can lead to disappointment and delay more appropriate care.
For some injections, image guidance such as ultrasound may be used to improve accuracy, especially around tendons, bursae and deeper joints. The decision is based on the area being treated and clinical circumstances. Sterile technique and careful post-procedure advice are essential regardless of the injection type.
A considered consultation should also address what has already been tried. Exercise therapy, physiotherapy, weight management where relevant, pacing of aggravating activity, bracing, medication and surgical assessment may all have a role. Injections work best when they complement a clear plan rather than replace one.
Questions worth asking before an injection
Before deciding, ask what structure is believed to be causing your pain and how confident the diagnosis is. It is also reasonable to ask what improvement is realistic, how long any benefit may last, whether imaging guidance is recommended and what rehabilitation should follow.
Patients should discuss diabetes, blood-thinning medicines, active infection, immune conditions, planned surgery and previous reactions to injections. If PRP is being considered, ask about the treatment protocol, likely out-of-pocket costs and the evidence for your specific condition, not just PRP in general.
The most appropriate treatment is the one that respects both the evidence and your individual circumstances. A thoughtful orthopaedic assessment can help clarify whether an injection may support your recovery, whether rehabilitation needs to be refined, or whether a more definitive option deserves discussion. The goal is not simply to reduce pain for a short period, but to help you move with greater confidence and preserve the activities that matter to you.
