Are you scheduled for a knee injection and wondering how to prepare properly? Knee injections deliver medication directly into the joint space to reduce inflammation and pain. The type of injection—corticosteroid, hyaluronic acid, or platelet-rich plasma—determines specific preparation requirements, though several steps remain consistent across all injection types.
Your orthopaedic surgeon will provide detailed instructions based on your medical history and the specific injection planned.
Medication Adjustments Before Your Injection
Blood-thinning medications require careful management before knee injections. Aspirin, warfarin, and newer anticoagulants like apixaban increase bleeding risk at the injection site. An orthopaedic surgeon will advise whether to stop these medications and for how long—typically 3-7 days before the procedure.
Anti-inflammatory medications need consideration. NSAIDs like ibuprofen and naproxen may interfere with certain injections, particularly platelet-rich plasma treatments. These medications are typically stopped 5-7 days before PRP injections unless an orthopaedic surgeon advises otherwise. Paracetamol remains safe to use for pain management during this period.
Diabetes medications continue as usual unless your injection includes corticosteroids. Steroid injections can elevate blood glucose levels for several days. Monitor your blood sugar more frequently after steroid injections and prepare to adjust insulin dosages accordingly.
Inform an orthopaedic surgeon about all supplements, including fish oil, vitamin E, ginkgo biloba, and garlic supplements. These natural products can affect blood clotting and may need temporary discontinuation.
What to Wear and Bring
Choose loose-fitting shorts or pants that roll up easily above the knee. Tight clothing restricts access to the injection site and may cause discomfort when dressing after the procedure. Athletic shorts or loose trousers work well.
Bring your regular walking aid if you use one. Some patients experience temporary stiffness or discomfort after injections. Having your cane or crutches for safe mobility immediately after the procedure.
⚠️ Note
Arrange transportation home after your injection. While you can typically walk immediately after, driving may be uncomfortable or unsafe if your knee feels stiff or numb from local anaesthetic.
Pack these items in a small bag:
- Identification
- List of current medications
- Any recent knee imaging (X-rays, MRI) on CD or reports
- Water bottle for hydration
- Light snack if you have diabetes
Day-of-Injection Instructions
- Eat a regular meal 2-3 hours before your appointment. Low blood sugar can cause dizziness during medical procedures. Avoid heavy meals that might cause nausea if you’re anxious about injections.
- Shower, then thoroughly clean the knee area with soap and water. Remove any lotions, oils, or topical medications from the injection site. The medical team will perform additional antiseptic cleaning, but starting with clean skin reduces the risk of infection.
- Remove jewellery from the affected leg, including ankle bracelets or toe rings. Metal items interfere with proper positioning and draping during the procedure.
- Arrive 15 minutes early to complete paperwork and allow time for vital sign checks. The actual injection takes 5-10 minutes, but the entire appointment typically lasts 30-45 minutes, including preparation and post-injection observation.
Managing Pre-Injection Anxiety
Communicate your concerns with the medical team—they can explain each step and help you feel more comfortable. Deep breathing exercises may help reduce anxiety: inhale slowly through your nose for four counts, hold for four counts, then exhale through your mouth for six counts.
The injection itself typically causes minimal discomfort. Local anaesthetic numbs the skin before the main injection. You’ll feel pressure as the medication enters the joint space, but sharp pain is uncommon. The entire needle insertion takes less than 30 seconds.
✅ Quick Tip
Focus on a spot on the wall or ceiling during the injection. Watching the procedure often increases anxiety. Your orthopaedic surgeon will talk you through each step.
Post-Injection Care Planning
Ice packs reduce swelling and discomfort after injections. Prepare several ice packs or frozen vegetable bags wrapped in thin towels before your appointment. Apply ice for 20 minutes every 2-3 hours during the first 24-48 hours.
Stock up on paracetamol for pain relief. Avoid NSAIDs for 48 hours after corticosteroid injections and up to 2 weeks after PRP injections unless your orthopaedic surgeon approves their use.
Plan for 24-48 hours of reduced activity. While complete bed rest isn’t necessary, avoid strenuous exercise, prolonged standing, or heavy lifting. Gentle movement helps distribute the injected medication throughout the joint.
Clear your schedule for the day after the injection. Some patients experience a temporary increase in pain (post-injection flare) lasting 24-48 hours. Having a flexible schedule lets you rest when needed.
When Different Injection Types Require Special Preparation
Corticosteroid Injections
- Monitor blood glucose levels if diabetic
- Prepare for potential facial flushing or mild insomnia for 1-2 nights after injection.
- These side effects resolve without treatment
Hyaluronic Acid Injections
- No special preparation beyond standard requirements
- These injections rarely cause systemic side effects
- Plan for the full series—typically 3-5 weekly injections
Platelet-Rich Plasma (PRP) Injections
- Consult your orthopaedic surgeon about anti-inflammatory medications before treatment.
- PRP requires a blood draw before processing, so staying well-hydrated before your appointment may be beneficial
- Your orthopaedic surgeon can provide specific guidance on fluid intake
What Our Orthopaedic Surgeon Says
Patients who prepare properly for knee injections may experience smoother procedures. A common oversight is continuing blood-thinning supplements without realising their effect. When patients arrive well-prepared, healthcare providers can focus on delivering treatment rather than managing preventable complications.
Keeping a symptom diary for one week before the injection may be helpful. Document pain levels, activities that worsen symptoms, and what provides relief. This information helps target the injection and set realistic expectations for improvement.
Putting This Into Practice
- Review all medications and supplements with your pharmacist. Create a comprehensive list including dosages and frequencies. Mark which ones affect blood clotting or inflammation for easy reference during your pre-injection consultation.
- Practice knee positioning at home. Sit on a firm surface with your leg extended straight. This is the typical position for knee injections. If this position causes severe discomfort, inform your doctor—alternative positions exist.
- Prepare your recovery space before leaving for the appointment. Set up a comfortable chair with an ottoman or footstool, place ice packs in the freezer, and position necessary items within easy reach.
- Test your post-injection transportation plan. Your driver is recommended to know the clinic location and the expected appointment duration. Have a backup transportation option ready.
- Document baseline symptoms the week before injection. Rate your pain on a 0-10 scale during different activities. This baseline helps track injection response during follow-up appointments.
When to Seek Professional Help
- Fever above 38°C developing within 48 hours of injection
- Increasing redness, warmth, or swelling at the injection site
- Severe pain unresponsive to rest and paracetamol
- Drainage or pus from the injection site
- Signs of allergic reaction: widespread rash, difficulty breathing, facial swelling
- Inability to bear weight on the injected knee after 48 hours
- Persistent numbness or tingling below the knee
Commonly Asked Questions
Should I exercise before my knee injection?
Gentle movement is fine, but avoid strenuous exercise 24 hours before injection. Heavy exercise can increase joint inflammation and make the infusion more uncomfortable. Light walking or stretching helps maintain joint mobility without causing additional irritation.
Can I shower after the injection?
You can shower 24 hours after the injection. Keep the injection site clean and dry for the first day. After 24 hours, gentle soap-and-water cleaning is safe. Avoid soaking in baths, pools, or hot tubs for 48 hours to reduce the risk of infection.
How long before I can return to sports?
Return to sports varies by injection type and individual response. Corticosteroid injections typically require 48-72 hours of rest before gradual resumption of activity. PRP injections may require 2-4 weeks of modified activity. Your orthopaedic surgeon will provide specific guidelines based on your injection type and athletic demands.
What if I’m allergic to certain medications?
Inform your orthopaedic surgeon about all known allergies during consultation. Most knee injection medications have alternatives for patients with allergies. Corticosteroid options include methylprednisolone, triamcinolone, or betamethasone. Local anaesthetics can be avoided entirely if you have severe allergies.
Will I need multiple injections?
Treatment plans vary by condition and injection type. Corticosteroid injections may be repeated if effective. Hyaluronic acid typically requires a series of weekly injections. PRP protocols range from single injections to a series of treatments spaced weeks apart.
Next Steps
Successful outcomes of knee injections depend on medication management, proper scheduling, and adherence to post-injection protocols. Arrange transportation, stop blood-thinning medications as directed, and prepare your recovery space in advance for optimal results.
If you’re experiencing persistent knee pain that interferes with walking or daily activities, an orthopaedic surgeon can evaluate whether injection therapy is appropriate for your condition.
