Microsurgery: What It Is, What It Treats, Risks and Recovery
Updated: 6 days ago
Written and medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026 · How we review
Quick Answer: What is microsurgery?
Microsurgery is a surgical technique that uses an operating microscope and precision instruments to repair or rebuild very small structures, such as blood vessels, nerves and lymphatic vessels. Surgeons use it to restore function after trauma, cancer or conditions present at birth, including reattaching amputated parts and transferring tissue, usually when traditional surgery is not enough. [1]
What the research says
Reattached fingers usually survive. In a review of 12 studies with 1,763 adults who lost a finger or thumb in an injury, 85.3% of reattached digits survived. People whose thumb was reattached reported better hand function than people who had the wound closed without reattachment. (Stone et al., Microsurgery, 2021) [2]
Reconnecting lymph vessels during cancer surgery lowers lymphedema risk. Across 17 studies and 2,261 patients who had lymph nodes removed from the armpit or groin, limb swelling (lymphedema) developed in 12.5% of people who had lymph vessels reconnected at the same operation, compared with 24.2% of those who did not. (Read et al., Microsurgery, 2026) [3]
Microsurgery can reduce established limb swelling. A review of 52 studies found that lymphatic microsurgery improved measured lymphedema by about 36% in the arm and 34% in the leg on average. (Hahn et al., Microsurgery, 2025) [4]
Key takeaways
Microsurgery repairs structures too small to see well with the naked eye, such as tiny blood vessels, nerves and lymphatic vessels. [1]
It treats the effects of injury, cancer and conditions present at birth. [1]
It is usually considered when traditional surgery and other treatments are not effective. [1]
The operation takes place in a hospital under general anesthesia. [1]
The first 24 hours after a flap operation are the most important for checking blood flow. [1]
Full healing and final results can take several months. [1]
What is microsurgery?
Microsurgery is a type of surgery in which the surgeon works through an operating microscope with very fine instruments to repair or rebuild tiny parts of the body. [1] The main goal is to restore function to a body part that no longer works well.
These tiny parts include blood vessels, nerves and parts of the lymphatic system. [1] A surgeon can perform microsurgery on any part of the body. [1]
You may read more about the wider field in our guide to reconstructive surgery and the role of a plastic surgeon.
What are the main types of microsurgery?
The three most common types of microsurgery are lymphatic system repair, free tissue transfer and blood vessel or nerve repair in the hand and arm. [1]
Type of microsurgery | What the surgeon does | Common reason |
Lymphatic system repair | Repairs or rebuilds tiny lymphatic vessels | Lymphedema (long-term limb swelling) |
Free tissue transfer (free flap) | Moves healthy tissue with its own blood supply to a new site and reconnects its vessels | Rebuilding the body after cancer or trauma |
Hand and upper-limb repair | Repairs injured blood vessels or nerves | Injuries to the hand or arm |
What conditions does microsurgery treat?
Microsurgery treats damage caused by physical injury, the effects of cancer and its treatment, and congenital abnormalities (conditions present at birth). [1]
Problem | How microsurgery helps |
Amputated finger, hand or limb | Reattaches the part to save the limb (limb preservation) |
Tissue lost to trauma or surgery | Rebuilds the missing tissue or body part |
Damaged nerves or blood vessels | Repairs or reconstructs them |
Damaged lymphatic system | Repairs tiny lymph vessels to help fluid drain |
Conditions present at birth | Reconstructs affected structures |
Doctors usually consider microsurgery when traditional surgery and other treatments are not effective. [1]
If lymph nodes are being removed as part of cancer care, our guide to axillary lymph node dissection explains why limb swelling can follow. For limb injuries, see amputation surgery and limb salvage surgery. Nerve problems are covered in peripheral nerve injuries and brachial plexus injury.
What happens before microsurgery?
Before microsurgery, you meet the surgeon for a consultation about your health, your goals and the planned procedure. [1]
During this visit, the surgeon may:
The consultation is the best time to ask questions. Write them down beforehand so you do not forget any.
What happens during microsurgery?
Microsurgery takes place in a hospital under general anesthesia, so you are asleep and do not feel pain. [1] The exact steps depend on the procedure.
In a free tissue transfer, the surgeon: [1]
Removes healthy tissue from a donor site on your body.
Moves the tissue to the area that needs rebuilding.
Reconnects its tiny blood vessels under the microscope.
Closes the incisions with removable stitches or dissolving sutures.
Learn more about being put to sleep for surgery in our anesthesia guide.
What is a flap in microsurgery?
A flap is a piece of tissue that carries its own blood supply. [1] The surgeon takes it from a donor site and uses it to replace missing tissue somewhere else in the body. Because the flap stays alive only if blood flows through its reconnected vessels, the care team watches it closely after surgery.
What happens after microsurgery?
After microsurgery, recovery depends on the type of operation you had. [1]
Close monitoring: After flap reconstruction, the team checks blood flow through the reconnected vessels. The first 24 hours are especially important. [1]
Healing time: Full healing and final results can take several months. [1]
Follow-up visits: You will need regular check-ups with your surgeon. [1]
Time off: You cannot drive, work or go to school right after surgery. [1]
Follow your post-operative instructions closely, as they help your body heal properly. [1]
What are the benefits and risks of microsurgery?
The main benefit of microsurgery is restoring function to body parts that are not working properly. [1] Like any operation, it also carries risks, which your surgeon reviews with you before surgery. [1]
Benefit | Possible risks and complications |
Restores function to damaged body parts | Bleeding |
Can reattach amputated parts | Pain, swelling or infection |
Rebuilds tissue lost to trauma or surgery | Numbness |
Repairs tiny nerves, blood vessels and lymph vessels | Scarring |
Uneven (asymmetrical) healing | |
Tissue loss (necrosis) | |
Need for more surgery in the future |
Our guide to surgical wound infection explains how to spot an infected incision early.
How long does recovery from microsurgery take?
Recovery from microsurgery depends on the type of surgery, and your surgeon will give you an estimate for your case. [1] Full healing and final results can take several months. [1]
Outcomes also vary from person to person and from one procedure to another. [1] Your surgeon can explain what to expect in your situation.
When should you call a doctor after microsurgery?
You should contact your surgeon if you notice signs of a surgical site infection, such as severe pain or swelling, and go to the emergency room right away for chest pain, an irregular heartbeat or trouble breathing. [1]
What you notice | What to do |
Severe pain at the surgery site | Call your surgeon or care team |
Severe swelling at the surgery site | Call your surgeon or care team |
Questions about your recovery | Call your care team |
Chest pain | Go to the emergency room immediately |
Irregular heartbeat | Go to the emergency room immediately |
Difficulty breathing | Go to the emergency room immediately |
Microsurgery at a glance
Question | Answer |
What it repairs | Tiny blood vessels, nerves and lymphatic vessels [1] |
Main uses | Trauma, effects of cancer, conditions present at birth [1] |
Anesthesia | General anesthesia (asleep) [1] |
Setting | Hospital [1] |
Most critical period | First 24 hours after flap surgery [1] |
Full healing | Several months [1] |
Main benefit | Restoring function [1] |
Conclusion
Microsurgery lets surgeons repair blood vessels, nerves and lymphatic vessels that are too small to fix with standard techniques. It can reattach injured parts, rebuild tissue after cancer or trauma, and help with lymphedema. Research shows most reattached fingers survive and that reconnecting lymph vessels during cancer surgery can nearly halve the rate of limb swelling. Recovery takes months, and the first day after flap surgery needs close watching. Knowing the warning signs helps you act fast if something goes wrong.
Next step: If you have been told you need microsurgery, bring your questions to your consultation and ask your surgeon about your expected recovery time. For more clear, doctor-reviewed guides, explore our reconstructive surgery guide and the rest of the Rinnit health library.
FAQ
What is microsurgery used for?
Microsurgery is used to repair or rebuild tiny blood vessels, nerves and parts of the lymphatic system. It helps reattach amputated body parts, rebuild tissue damaged by trauma or surgery, and treat the effects of cancer and conditions present at birth. [1]
Is microsurgery done under general anesthesia?
Microsurgery is done under general anesthesia in a hospital, so you are asleep and do not feel pain during the operation. [1]
What is a free flap?
A free flap is a piece of healthy tissue with its own blood supply that a surgeon moves from one part of the body to another. The surgeon reconnects its blood vessels under a microscope to rebuild an area after cancer or trauma. [1]
How long does it take to recover from microsurgery?
Recovery from microsurgery depends on the type of operation, and full healing and final results can take several months. Your surgeon will give you an estimate for your case. [1]
What are the risks of microsurgery?
The risks of microsurgery include bleeding, pain, swelling, infection, numbness, scarring, uneven healing, tissue loss (necrosis) and the need for more surgery later. Your surgeon reviews these risks with you before the operation. [1]
Why are the first 24 hours after flap surgery so important?
The first 24 hours after flap surgery are important because the care team must confirm that blood is flowing well through the reconnected vessels. A flap needs this blood supply to survive. [1]
Can I drive after microsurgery?
You cannot drive, work or attend school right after microsurgery. Your surgeon will tell you when it is safe to return to these activities. [1]
When should I go to the emergency room after microsurgery?
Go to the emergency room immediately if you have chest pain, an irregular heartbeat or difficulty breathing after microsurgery. Call your surgeon for severe pain or swelling at the surgery site. [1]
What is replantation?
Replantation is microsurgery to reattach a body part, such as a finger, that has been cut off. If this happens, call 911, wrap the part in damp gauze, seal it in a plastic bag and place the bag on ice without letting the part touch the ice directly.
Will I need therapy after microsurgery?
Many people need physical or occupational therapy after microsurgery, especially after hand, nerve or tissue transfer surgery. Therapy helps restore movement, strength and function.
Related Reading
DIEP Flap Surgery: Breast Reconstruction, Recovery and Results explains DIEP flap breast reconstruction using tissue from the belly.
Breast Reconstruction: Implant and Flap Options, Surgery and Recovery covers implant and tissue options for rebuilding the breast.
Peripheral Nerve Injuries: Symptoms, Causes & Treatment — Why Numbness Needs Early Care explains peripheral nerve injuries, symptoms and repair options.
Brachial Plexus Injury: Symptoms, Causes, and Treatment describes brachial plexus injuries and how they are treated.
References
Cleveland Clinic. Microsurgery: What It Is, Procedures & Instruments Used. Cleveland Clinic. Last updated April 17, 2024. https://my.clevelandclinic.org/health/treatments/microsurgery
Stone N, Shah A, Chin B, et al. Comparing digital replantation versus revision amputation patient reported outcomes for traumatic digital amputations of the hand: A systematic review and meta-analysis. Microsurgery. 2021;41(5):488-497. PMID 33811398. https://doi.org/10.1002/micr.30738
Read T, Arora R, Velli G, et al. Prophylactic Immediate Lymphatic Reconstruction for the Prevention of Secondary Lymphedema: A Systematic Review and Meta-Analysis of Comparative Studies. Microsurgery. 2026;46(7):e70295. PMID 42803604. https://doi.org/10.1002/micr.70295
Hahn BA, Kleeven A, Richir MC, et al. Objectifying Clinical Outcomes After Lymphaticovenous Anastomosis and Vascularized Lymph Node Transfer in the Treatment of Extremity Lymphedema: A Systematic Review and Meta-Analysis. Microsurgery. 2025;45(3):e70050. PMID 40066947. https://doi.org/10.1002/micr.70050
Medical disclaimer
This article is for general education and does not replace advice from your doctor or surgeon. Always talk to a qualified healthcare professional about your own condition and treatment. If you have chest pain, an irregular heartbeat or trouble breathing, seek emergency care immediately.
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