Let's learn everything about the special injection for thigh pain (Femoral Nerve Block)

Are you about to have surgery on your hip or knee? Or are you in unbearable pain due to an accident like a broken leg? Then your doctor may have told you about a "Femoral Nerve Block." Although the name may sound a little scary, this is actually a very useful and safe method of pain control. Let's talk about it simply today.

What is Femoral Nerve Block?

Simply put, a Femoral Nerve Block is an injection of a pain-relieving drug near a major nerve in your thigh. We call this nerve the 'femoral nerve.' This is one of the largest nerves in your leg. Much like the electrical wires in our homes, this nerve carries messages from your leg to your brain and back to your leg.

This nerve has two main functions:

1. Motor function: Helps you move your hips, legs, ankles, and feet.

2. Sensory function: The ability to feel things like touch, pain, heat, and cold.

Now imagine that the doctor injects a numbing medicine near this nerve. What happens is, like turning off an electrical switch, that the pain signals going through that nerve to the brain are temporarily stopped. That's what we call ``analgesia'' or ``regional anesthesia.'' You won't feel any pain while the medicine is taking effect. Also, the muscles in that area may temporarily become weak.

Where is this vaccine given?

This shot is usually given in the middle of your upper thigh, near your pelvis. Your femoral nerve comes from a group of nerves that start in your lower back (the `lumbar plexus`). So your doctor will give you this shot by looking for the right spot along the path that the nerve takes down your thigh.

What are the uses of a Femoral Nerve Block?

This method is mainly used in two situations. One is as a numbing agent for surgery, and the other is to control pain in the event of an accident.

Imagine someone falls and breaks their hip. When they are brought to the hospital's Emergency Department (ETU), they get an X-ray, and even moving their leg causes unbearable pain. In such cases, doctors use this nerve block to make it easier to examine the patient and reset the broken bone.

How should you prepare for this?

The way you prepare for this varies slightly depending on the reason you are being given this nerve block.

• If it's an emergency: You don't need to prepare anything in particular. The medical team at the ETU will take care of everything you need.
• For planned surgery: Your doctor will give you specific instructions. For example, you may be asked to fast (not eat or drink anything except water) for several hours before surgery. You may also be asked to temporarily stop taking certain medications. It is very important that you follow these instructions exactly.

What happens when this nerve block is given?

I'll explain to you a little bit how this process happens.

1. First, you will be made to lie comfortably on a bed.

2. To reduce your fear and anxiety, and to help you relax, a small amount of sedative medication (`sedative`) can be given through the saline cannula (`IV line`) in your arm.

3. Throughout this time, the medical team will monitor your health. They will continue to measure things like your blood oxygen level (pulse oximeter), heart rate (EKG), and blood pressure.

4. Next, the doctor will find the exact location of the femoral nerve. This is often done using an ultrasound machine . Like a baby scan, this machine can clearly see the nerve inside your leg. Sometimes a nerve stimulator is used.They also use a device called a stimulator. What happens here is that very small electrical signals are sent to the nerve through a small needle. Then the muscles in your kneecap twitch a little. That allows the doctor to confirm that it is the right nerve.

5. Once the right spot is found, a small amount of medicine is first injected to numb the area where the nerve block needle will be inserted. This will prevent you from feeling much pain. It may feel like a slight prick.

6. Finally, the main anesthetic is injected right next to the nerve. Sometimes, it's done with just one injection. But if you want to continue to control the pain after surgery, a very thin, flexible tube called a catheter is inserted into the area and taped to the skin with a plaster. The tube can then continue to deliver the medication into the body little by little.

What are the advantages of this?

The main advantage of a femoral nerve block is that it can be used to control pain very effectively.

In addition, there is another important advantage. That is, it can minimize the use of strong painkillers in the `opioid` group (e.g. morphine, tramadol). Since these `opioid` drugs have a risk of addiction and can cause side effects such as nausea, vomiting, and constipation, it is very good to reduce their use. Because of this nerve block, you may also be able to go home from the hospital sooner.

Are there risks and complications?

As with any medical treatment, there are very small risks. But these are very rare. That means they don't happen very often. But it's important to be aware.

• Nerve damage: This can be temporary or, very rarely, permanent.
• Allergic reaction to the drug.
• Hematoma: A small amount of blood collects under the skin where the needle entered.
• Infection.
• Local Anesthetic Systemic Toxicity: This is a very rare but serious reaction to local anesthetics. But don't worry, your medical team is ready to treat it at any time.

How long will this numbness last?

The duration of this numbness can vary from person to person. There are several factors that affect it. This time is determined by things like the type of drug used, its amount, and its concentration. It can usually last from a few hours to about 24 hours. Depending on your condition, you can ask your doctor for more information about this.

What time should I call the doctor?

After you go home from the hospital, if you develop any new symptoms or problems related to the nerve block , call your doctor immediately.

Be especially careful about these things:

• If there is swelling, redness, or pus at the injection site (these may be signs of infection).
• If you have persistent pain, numbness, or weakness in your leg, such as a burning sensation .

Femoral nerve block is a very good and safe way to control pain. If you still have any concerns or doubts about this, talk to your doctor about it openly. He or she will answer all your questions.