Ulnar Collateral Ligament Tear of the Thumb

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The thumb joint constitutes perhaps the most decisive anatomical element for the evolution of human dexterity. The ability of the thumb to move freely, to oppose the rest of the fingers, and to function as a counterweight allows us to execute both powerful grips (to hold a heavy tool) and delicate movements of precision (such as writing or buttoning a piece of clothing). For these movements to be executed with force, the joint at the base of the thumb must be absolutely stable.

When this stability is compromised, the entire biomechanics of the hand collapses. One of the most serious and characteristic injuries causing this instability is the Ulnar Collateral Ligament Tear of the Thumb (UCL tear). This is an injury that is frequently underestimated by patients as a “simple sprain,” but if neglected, it can lead to permanent weakness and painful arthritis.

What is a UCL tear – Ulnar collateral tear of the thumb or Skier’s Thumb?

To understand the injury, we must focus on the metacarpophalangeal (MCP) joint of the thumb. This is the joint located at the base of the thumb, exactly where the finger joins the palm.

This joint is held together and stabilized by a network of strong ligaments. The most critical of these is the Ulnar Collateral Ligament (UCL). It is located on the inner side of the joint (on the side of the thumb that “looks” toward the index finger). This ligament functions like a strong rope that prevents the thumb from “opening” excessively outward, functioning as the basic fulcrum during our effort to tightly grasp objects (pinch grip functionality).

A UCL tear is the medical condition in which this soft tissue is stretched violently beyond its normal limits of elasticity, resulting in a partial or total tear (being cut). This injury is widely known as Skier’s Thumb in acute injuries, or Gamekeeper’s Thumb in chronic, repetitive injuries.

A severe injury leading to a complete tear of the ligament completely destabilizes the joint and usually requires immediate surgical intervention to restore the full function of the thumb as well as the entire hand.

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What are the causes and the mechanism of injury?

The tear of the ulnar collateral ligament does not occur from normal wear and tear, but is always caused by sudden, mechanical stress.

The mechanism is very specific: A UCL tear can occur in any phase in which the thumb is “opened” violently, bent abruptly backward or sideways (away from the index finger – extreme abduction and hyperextension) with significant force.

The most common causes include:

Skiing Accidents (Skier’s Thumb):

It is the most classic mechanism, which is why the condition took this name. The injury frequently occurs when a skier loses their balance and falls onto the snow with an outstretched hand, while still holding the ski pole. The pole functions like a lever that violently presses the thumb outward, tearing the ligament.

Ball sports:

If a fast, heavy ball (such as in basketball, volleyball, or rugby) strikes the tip of the thumb and bends it violently backward, it can also cause a tear of the ligament.

Unexpected falls:

A simple fall on the ground where the person attempts to support themselves and their hand “slips”, forcing the thumb to open excessively.

Traffic and bicycle/motorcycle accidents:

When the rider holds the handlebars tightly and a sudden collision occurs, the thumb is driven violently backward.

Chronic strain (Gamekeeper’s Thumb):

In the past, this term referred to Scottish gamekeepers who suffered a chronic tear of the ligament due to the repetitive, daily movement they performed to break the neck of game (rabbits). Today, this term describes any chronic insufficiency of the ligament from continuous, light traumas.

What are the symptoms?

The clinical picture is usually noisy immediately after the accident. Many patients mistakenly think that they simply “sprained” their finger. The main symptoms of a UCL tear include:

Intense, sharp pain: It appears instantly at the base of the thumb, and more specifically in the area of the “web space” between the thumb and the index finger.
Pain during movement: The pain usually worsens dramatically with any movement of the thumb, and is located along its inner side, closer to the index finger.
Significant edema (swelling): The joint swells very quickly immediately after the injury due to internal bleeding.
Bruises (Ecchymoses): Blood from the torn ligament spreads under the skin, creating characteristic bruises around the base of the thumb, which sometimes reach up to the palm.
Suddenly weakness of grasping (Pinch weakness): It is perhaps the most characteristic functional symptom. The sudden inability for the patient to grasp something tightly between the thumb and the index finger (such as turning a key, opening a bottle, or holding a pen) is the absolute indication of a UCL tear, as the thumb “gives way” and no longer has a stable fulcrum. [Image demonstrating pinch grip and how UCL tear causes weakness in this action]
Apparent Instability: In cases of a complete tear, the patient may feel that the thumb joint “opens” or slips (subluxates) unnaturally when pressure is exerted upon it.

How is the diagnosis of skier’s thumb performed?

Delayed diagnosis is the greatest enemy in this condition. If it is not treated correctly and timely (ideally within 3-4 weeks from the injury), the ligament will not heal, leading to permanent instability, pain, and the rapid development of osteoarthritis.

The specialized surgeon, Mr. Polyzois, will see you at his clinic and take a detailed history, giving special emphasis to the mechanism of the fall.

Subsequently, he will examine you very carefully to check the movement and, most importantly, the stability of the injured thumb compared to the normal side. The doctor will exert controlled pressure (valgus stress test) to see how much the joint “opens”. If the joint opens excessively and without resistance (without a clear endpoint), this confirms a complete tear. An examination of the rest of the hand, wrist, and arm will also be completed to rule out other accompanying injuries.

Imaging Examinations

The differential diagnosis can also include a fracture of the thumb, dislocation, or a tear in other ligaments. That is why examinations are required:

Plain X-rays (X-rays): Mr. Polyzois will first send you for an X-ray. Although ligaments do not show on X-rays, the purpose is to rule out a possible fracture in the bones of the thumb. Often, when the ligament tears, it “uproots” (avulses) a small piece of bone along with it (avulsion fracture), which is apparent on the X-ray.
Ultrasound or Magnetic Resonance Imaging (MRI): Sometimes, especially when doubt exists, the clinical check due to pain is not clear. In these cases, an ultrasound or a magnetic resonance imaging is deemed absolutely necessary for the diagnosis, as they depict soft tissues excellently. These examinations serve to ascertain between a partial and total tear, but mainly to determine if a so-called Stener lesion exists.

What is the treatment for a UCL tear?

The treatment depends directly on the degree of the tear (partial or total). If Mr. Polyzois diagnoses that a patient has a UCL tear, he will evaluate the severity of the injury (and any anatomical traps) before proceeding with the treatment, which is always personalized, taking into account all relevant factors (age, occupation, sports demands).

Conservative Treatment (Non-Surgical)

In the case of a partial tear (where the ligament has stretched or torn slightly, but the joint remains stable and no Stener lesion exists), the treatment is conservative.

The thumb is fully immobilized with a special, rigid splint (or a thumb spica cast) for approximately four to six weeks. Immobilization allows the ends of the torn ligament to “weld” and create strong scar tissue, usually leading to complete healing.

Subsequently, when the splint is removed, the patient follows a precise, personalized rehabilitation program with a special physiotherapist to regain strength and elasticity, as the joint will initially be stiff.

Surgical Treatment

If the tear is complete (the ligament has been cut completely in two or has been uprooted from the bone) or if a Stener lesion exists, conservative treatment is doomed to failure. In these cases, treatment is a one-way street and is strictly surgical.

Mr. Polyzois, as a specialized hand surgeon, will offer the most appropriate, modern surgical technique depending on each patient. The goal of surgery is to reconnect the cut ligament back to the bone, restoring anatomical stability.

The Surgical Procedure (Speed and Safety):

Anesthesia: Most of the time, general anesthesia is not required. The team’s specialized anesthesiologist administers specialized regional anesthesia (only the hand is numbed – Awake Surgery), and the patient remains awake during the operation, if they wish, of course.
The Technique: Through a very small incision (3-4 centimeters) on the side of the thumb and with a minimally invasive technique (MIS), Mr. Polyzois locates the ends of the torn ligament. Then, he anchors the ligament firmly onto the bone (from the side of the tear) using ultra-modern, absorbable materials (microscopic suture anchors). In chronic, old cases (where the old ligament has “melted”), the doctor also adds a special biological graft (from another tendon of the hand) for further reconstruction and stability, where indicated.
After surgery: The operation lasts approximately 30-45 minutes. The patient is discharged from the hospital (Day Clinic) a few hours later with a simple dressing around the thumb for 48 hours.
Rehabilitation: In most cases of modern surgeries, the patient then immediately moves the thumb and hand for light movements without any restriction (e.g., they can write, hold their mobile phone). Early mobilization prevents stiffness. Subsequently, a specific strengthening program begins. Returning to heavy sports activities is safely allowed in about 6-8 weeks.

The operation is painless and completely bloodless. In the hands of a fully specialized surgeon like Mr. Polyzois, it has exceptionally high success rates (almost 100% functional restoration) and very low (almost zero) complication rates.

A Few Words About the Doctor (Dr. Polyzois)

Hand surgery and the reconstruction of the microscopic ligaments of the thumb require absolute microsurgical precision and deep specialization. A mistake in the re-anchoring angle of the ligament can leave the finger permanently stiff.

Orthopedic Surgeon Mr. Ioannis Polyzois is the only Orthopedic surgeon in Greece in shoulder and upper limb surgery with certified prior service in a permanent directorial position (substantive Consultant) for 10 consecutive years in the National Health System (NHS) of Great Britain.

During his long and successful tenure in the most demanding trauma centers of London, he has managed and restored thousands of complex sports injuries of the hand. His philosophy is based on honest communication, valid diagnosis, and the implementation of the most advanced, minimally invasive techniques ensuring rapid recovery without pain. If you experience pain and instability in the thumb joint for more than a few days after an injury, it is very important to seek specialized treatment as soon as possible. Do not hesitate to contact Mr. Polyzois and his team to give a definitive solution to your problem.

Cost and Prices for the Management of a UCL Tear

We fully understand that a sudden sports or work injury is often accompanied by the reasonable question of the financial cost of the treatment. In our clinic, the provision of medical services of excellence is always characterized by absolute transparency, keeping the cost fair and affordable.

The final cost of managing “Skier’s Thumb” is adjusted depending on the severity of the injury. If the tear is partial and requires conservative treatment, the cost is restricted exclusively to the medical examination, imaging examinations, and the splint.

If, due to a total tear or a Stener lesion, surgical operation is deemed imperative (re-anchoring of the ligament with anchors), the total cost depends on the needs of the surgery. However, the fact that modern operations are performed exclusively as day cases (Day Clinic), without general anesthesia and without an overnight stay, drastically reduces the total expenses of the hospital.

Our clinic maintains excellent cooperation with all private insurance companies. Also, the option to use the state insurance body (EOPYY) is provided to cover a significant part of clinical (imaging examinations, hospitalization) and pharmaceutical expenses. Following the comprehensive clinical examination, we will discuss thoroughly with you and you will receive a clear, detailed, and personalized financial brief, without any “hidden” charge.

Movement is life! Contact the doctor for specialized orthopedic care, tailored to your needs.

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Συχνές ερωτήσεις

Can I continue to use my hand after the injury?

It is absolutely dangerous to continue to exert pressure on your thumb. If you have suffered a partial tear, continuing activity (especially sports or weightlifting) can convert the injury into a total tear. Address the pain as a warning sign: stop the activity immediately, apply ice, and immobilize the finger until you are examined by a specialist orthopedic surgeon.

What is a “Stener” type lesion (Stener Lesion)?

A Stener lesion is the most critical anatomical “trap” in this injury and the reason why surgical operation often becomes mandatory. Normally, the ulnar collateral ligament (UCL) lies beneath a thin membrane (aponeurosis) of a muscle (the adductor pollicis). When the ligament is completely cut, its torn end can be pulled and become “trapped” outside and above this membrane. [Image diagram of Stener lesion, showing the torn UCL displaced above the adductor aponeurosis] Because a tissue now exists between the two cut ends of the ligament, it is anatomically impossible (even if they place a cast on you for months) to “weld” on its own. A Stener lesion means 100% surgery. Ultrasound and magnetic resonance imaging can reveal this condition.

How important is early diagnosis?

Early diagnosis is the “A and Z” in the success of treatment. There is a golden window of opportunity (about 3-4 weeks after the accident). If the operation is performed within this period (acute phase), the doctor can simply suture and re-anchor your own ligament with absolute success. If you delay for months (ignoring the problem), the cut ligament will retract (“shrink”), lose its elasticity, and be resorbed. In this case, simple suturing is impossible and a much more complex surgical reconstruction operation is required (where the doctor must take a tendon graft from another spot of the hand to make a “new” ligament).

Can it permanently affect the strength of the thumb?

Yes, undoubtedly. If a total tear is not operated on, the thumb permanently loses its point of support. Every time you try to “pinch” something tightly (e.g., to open a tight jar), the thumb will slip out of its joint (subluxation), causing pain and loss of strength (Pinch weakness). Furthermore, this chronic instability and the friction of the bones will lead with absolute certainty to the development of premature and painful osteoarthritis (post-traumatic arthritis) at the base of the thumb within a few years, which is irreversible.

Is there a difference between an acute and a chronic tear?

Yes, and the difference determines the treatment. The acute tear occurs instantly after an accident (e.g., at the time you are skiing) and is accompanied by immediate, sharp pain and swelling (Skier’s Thumb). The chronic tear (Gamekeeper’s Thumb) is the result of old, untreated injuries or continuous strain of the joint. In a chronic tear, the patient may not remember a specific accident, but complains of a permanent, mild pain, great weakness in grasping objects (which drop from them constantly), and apparent laxity of the joint.

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