If you have thumb pain that never quite went away after a sprain, you might be wondering if something was missed. You are not alone. This article looks at a study that found something important. Many serious thumb injuries at the base of the thumb are not diagnosed correctly. When these injuries are not treated properly, they can lead to long term problems like instability and arthritis.
Here are three quick points from this study:
- Doctors too often miss serious ligament injuries at the base of the thumb.
- If these injuries are not fixed early, they can cause chronic instability and arthritis later.
- Early surgery to repair these ligaments can prevent these long term problems.
Key Findings at a Glance
- Ligament injuries at the base of the thumb are frequently missed or misdiagnosed by doctors.
- Ten patients received early ligament repair surgery after recent thumb sprains, and eight of these injuries came from sports.
- Ball sports often cause radial instability, while contact sports typically cause ulnar instability.
- Different surgical techniques are used depending on which ligament was torn and which direction the thumb is unstable.
- Early surgical repair can prevent chronic instability and secondary rhizarthrosis (arthritis at the base of the thumb).
What Is the Joint at the Base of Your Thumb?
The base of your thumb has a very special joint. This joint is called the carpometacarpal joint. Some people also call it the CMC joint or the trapezoid metacarpal joint. This joint is where your thumb bone meets a small bone in your wrist.
This joint lets your thumb move in many different ways. That is why you can touch your fingertips with your thumb. You can also grip a ball or hold a cup. The wide range of motion comes from this special joint.
Here is where it gets interesting. This joint is held stable by strong bands of tissue called ligaments. Ligaments are like strong ropes that hold bones together. When you hurt your thumb badly, these ligaments can tear. If the ligaments do not heal correctly, your thumb joint becomes unstable. An unstable joint can wear out faster and develop arthritis.
What Did This Study Find?
According to this study, doctors reported on 10 patients who had severe thumb sprains. All of these patients received surgery to repair their torn ligaments soon after the injury happened. This is called early ligament repair.
The study found that most of these injuries were missed or not diagnosed correctly at first. This is a serious problem. When a torn ligament is not found, it cannot be fixed properly. The thumb joint then becomes unstable over time.
Research shows that this instability can lead to a condition called secondary rhizarthrosis. This is a fancy medical word for arthritis that develops at the base of the thumb because of an old injury.
You may be wondering why this matters. If your thumb sprain was never properly diagnosed, you might be living with instability right now. That instability might be slowly wearing down your joint. This could explain your ongoing thumb pain.
What Causes These Injuries?
The study found that eight out of the 10 patients hurt their thumbs during sports. Sports injuries to the thumb are more common than many people realize.
Let us look closer at the different ways these injuries happen.
Ball Sports and Radial Instability
Ball sports like basketball, volleyball, or handball often cause a specific type of injury. When you reach out to catch or block a ball, your thumb can be forced suddenly outward. This movement is called radial hyperabduction. It is a big word that simply means your thumb is pushed too far away from your hand in a sudden motion.
This sudden force can tear a strong ligament on the inside edge of your thumb. This ligament is called the ulnar ligament. When it tears, your thumb becomes unstable in the radial direction. That means your thumb wobbles or moves too much toward the outside of your hand.
Contact Sports and Ulnar Instability
Contact sports like football, rugby, or martial arts cause a different kind of injury. In these sports, your thumb can be suddenly pushed backward. This is called retropulsion. Think of falling on your hand with your thumb bent back.
This backward force can damage ligaments on the outer edge of your thumb. When these ligaments tear, you get ulnar instability. Your thumb becomes wobbly in a different direction.
Axial Compression Injuries
There is a third way your thumb can be injured. Sometimes your thumb is bent and then a force pushes straight down on it. This is called axial compression. Imagine punching something with a closed fist and your thumb tucked in.
This force can rupture the capsule and ligaments that wrap around the joint. The capsule is like a bag that surrounds the joint. When it tears along with the ligaments, your thumb can become unstable in the radial direction again.
How Do Doctors Fix These Injuries?
According to this study, doctors used different surgical techniques depending on which ligament was torn. Each type of instability needs a different repair.
Repair for Radial Instability from Ball Sports
When the strong ulnar ligament tears from ball sports, doctors used a technique called ligament plasty. Plasty means rebuilding or repairing something. In this case, surgeons used a tendon from another part of your wrist called the flexor carpi radialis. This tendon normally helps bend your wrist. A small part of it can be used to rebuild the torn ligament at the base of your thumb.
This technique was developed by doctors named Eaton and Littler. It helps stabilize the thumb in the radial direction.
Repair for Ulnar Instability from Contact Sports
When ligaments tear from backward force, doctors used a different tendon. They used part of the abductor pollicis longus. This is a tendon that normally helps move your thumb away from your hand. Surgeons can use a piece of it to rebuild the damaged ligaments.
This technique was created by a doctor named Brunelli. It restores stability when your thumb has been pushed backward.
Repair for Compression Injuries
When the capsule and ligaments tear from compression, doctors used an augmentation plasty. Augmentation means adding extra support. In this surgery, doctors used two tendons: the extensor carpi radialis brevis (which helps bend your wrist back) and the abductor pollicis longus (which helps move your thumb).
This technique was proposed by doctors named Pequignot and colleagues. It gives extra strength to the damaged area.
Why Does Early Treatment Matter So Much?
The most important message from this study is about timing. Research shows that fixing these ligament tears early makes a big difference. When surgery happens soon after the injury, the ligaments can be repaired more easily. The tissues are still fresh and easier to work with.
If the injury is missed and months or years go by, the damage gets worse. The torn ligament cannot heal on its own. The thumb joint becomes more and more unstable. Every time you use your thumb, the bones move in ways they should not. This abnormal movement wears down the cartilage.
Over time, this leads to secondary rhizarthrosis. The cartilage wears away. The bones start to rub together. You develop arthritis. The pain gets worse. Your thumb becomes stiff and weak.
Early surgery can prevent this chain of events. That is why correct diagnosis right after a thumb sprain is so important.
About This Site
This website is dedicated to helping people like you understand thumb pain and rhizarthrosis. We take published scientific articles from medical journals and translate them into simple language. We never invent facts. Everything you read here comes from real research done by doctors and scientists. Our goal is to help you make informed decisions about your health. We invite you to explore more articles on this site to learn about your condition and your treatment options.
Frequently Asked Questions
How do I know if I have a ligament tear at the base of my thumb?
If you sprained your thumb and it still feels unstable, wobbly, or painful months later, you might have a ligament tear that was not diagnosed. You should see a doctor who specializes in hands. They can examine your thumb and order imaging tests to check for ligament damage.
Can a torn thumb ligament heal on its own?
Some minor ligament injuries can heal with rest and splinting. However, severe tears often do not heal properly without surgery. According to this study, untreated severe ligament tears can lead to chronic instability and arthritis over time.
What happens if my thumb ligament injury is not treated early?
Research shows that when ligament injuries at the base of the thumb are not treated, the joint becomes unstable. This instability causes abnormal wear on the cartilage. Over time, this can lead to secondary rhizarthrosis, which is arthritis at the base of your thumb.
Is surgery the only option for a torn thumb ligament?
This study focused on surgical repair for severe ligament tears. Early surgery helped prevent long term problems. However, every injury is different. Your doctor will examine you and recommend the best treatment for your specific situation.
Conclusion
This study teaches us something very important about thumb injuries. Ligament tears at the base of the thumb are often missed or misdiagnosed. When they are not treated early, they can cause long lasting instability. This instability can lead to arthritis years later.
If you hurt your thumb badly and it never quite felt right again, it is worth getting it checked by a hand specialist. Early diagnosis and treatment can make a big difference. The surgical techniques described in this study show that doctors can repair these injuries when they are caught early.
You deserve to have a pain free, stable thumb. Do not ignore ongoing pain or instability. Seek help from a qualified doctor who understands these injuries. The sooner you get the right diagnosis, the better your chances of preventing long term problems.
Disclaimer
This article is for informational purposes only. It is not medical advice. It does not replace a consultation with a qualified healthcare professional. If you have thumb pain or suspect an injury, please see a doctor for proper evaluation and treatment. Every person is different, and only your doctor can recommend the right treatment for your specific situation.
Article Citation
Study by: Fontes, D. (1992)
Read the full study here:
https://www.ncbi.nlm.nih.gov/pubmed/1561872
If surgery is on the table, explore implant types, survival rates, and what to realistically expect.
Implant Comparisons
