Image-Guided Corticosteroid Injections — Epoch Medical Imaging
Image-guided cortisone injections at Epoch Medical Imaging, St Ives. Precise, effective pain relief for joints, tendons and bursae. Serving the North Shore.
What Is a Corticosteroid (Cortisone) Injection and How Does It Work?
A corticosteroid injection — commonly called a cortisone injection — delivers a powerful anti-inflammatory medication directly into a painful joint, bursa, tendon sheath, or the space around a nerve. It is one of the most widely used and effective treatments for inflammatory and degenerative musculoskeletal pain.
How it works:
– Corticosteroids are synthetic versions of hormones your body naturally produces. When injected precisely into an inflamed area, they suppress the local inflammatory response — reducing swelling, warmth, and pain.
– Unlike oral anti-inflammatory medications, which affect the whole body, a targeted injection delivers the medication exactly where it is needed — maximising the therapeutic effect while minimising systemic exposure.
– The result is typically meaningful pain relief and improved function, often beginning within a few days and lasting weeks to months depending on the condition and individual response.
At Epoch Medical Imaging in St Ives, all cortisone injections are delivered under real-time image guidance — either ultrasound or CT — to ensure the medication reaches precisely the right location every time.
Why Is Image Guidance Important for Steroid Injections?
The accuracy of a steroid injection delivery is one of the most important factors determining how effective it will be — and image guidance transforms accuracy.
Why guidance matters:
– Without image guidance, injections are delivered using surface anatomy landmarks alone. Studies consistently demonstrate that unguided injections miss their intended target in a significant proportion of cases — even in experienced hands.
– This is particularly true for deep joints such as the hip, small joints of the hand and foot, tendon sheaths, and the epidural space.
– Ultrasound and CT guidance allows the radiologist to watch the needle in real time as it is advanced to the target — confirming precise placement before the medication is injected.
– CT guidance is used for deeper targets such as spinal injections, where direct ultrasound visualisation is not possible.
The clinical benefit is clear: accurately placed injections provide better pain relief, longer-lasting benefit, and a lower chance of inadvertently injecting adjacent structures. At Epoch Medical Imaging in St Ives, image guidance is standard for all steroid injections — not an optional extra.
Ultrasound vs CT Guided Steroid Injections: Which Is Used When?
Both ultrasound and CT guidance are used for steroid injections at Epoch Medical Imaging — the choice depends on the target structure, its depth, and the clinical indication.
Ultrasound is preferred wherever possible — it is real-time, involves no radiation, and provides excellent visualisation of joints and soft tissue targets. CT guidance is reserved for where ultrasound visualisation is limited. Your radiologist will use the most appropriate modality for your specific injection.
How Long Do the Effects of a Steroid Injection Last?
The duration of benefit from a cortisone injection varies between individuals and depends on the condition being treated, the severity of inflammation, and individual response.
What to expect:
– Onset: Most patients notice improvement within 2 to 5 days. Some experience benefit within hours; others may take up to 2 weeks to feel full benefit.
– Duration: For most conditions, benefit lasts between 4 weeks and 6 months. Joint injections for arthritis tend to provide benefit for 3 to 4 months on average, though some patients have relief for 6 months or more.
– Individual variation: Response to cortisone is not entirely predictable — some patients respond very well and repeatedly; others have a shorter or less complete response.
Important note: A cortisone injection treats inflammation and pain — it does not repair or cure the underlying condition. For ongoing conditions such as arthritis, repeat injections may be needed. Your GP will advise on the appropriate interval and frequency based on your response and the joint or structure involved.
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