Boutonnière deformity can affect everyday activities such as gripping, grasping, and performing fine motor tasks due to the finger becoming bent downward at the middle joint and hyperextended at the fingertip. Many patients seek treatment after a traumatic injury or chronic condition begins interfering with their hand function and quality of life.
Patient Success Stories
Hear from patients who experienced a full recovery from complex finger injuries and deformities after treatment with Dr. Badia and his team.
Understanding Boutonnière Deformity
Boutonnière deformity is a condition that affects the extensor mechanism of the finger. It occurs when the central slip of the extensor tendon is damaged or disrupted. This causes the middle joint of the finger (proximal interphalangeal or PIP joint) to poke through the tendon gap like a buttonhole, resulting in it being permanently bent downward.
As a result of this imbalance, the end joint of the finger (distal interphalangeal or DIP joint) is pulled backward into hyperextension. Early diagnosis and proper treatment are crucial to allow the tendon to heal correctly and to restore normal finger alignment and mobility.
What is Boutonnière deformity?
Boutonnière deformity simply means that the central tendon on the back of the finger has been torn, weakened, or detached. This injury compromises the finger’s ability to straighten at the middle joint.
This condition usually stems from a traumatic injury to the extensor mechanism, but it can also be caused by chronic inflammation from rheumatoid arthritis or other inflammatory joint diseases. This structural disruption leads directly to the noticeable symptoms of Boutonnière deformity.
The symptoms most often reported with Boutonnière deformity are pain, swelling, stiffness, and an inability to actively straighten the middle joint of the finger. If allowed to progress untreated, the deformity can become fixed, leading to permanent stiffness and loss of normal hand function.
Common Symptoms
Boutonnière deformity symptoms may appear immediately after a traumatic injury or develop gradually if caused by an underlying inflammatory condition. The classic “buttonhole” appearance is the primary indicator.
Bent Middle Joint (PIP)
The middle joint of the affected finger is permanently bent downward (flexed) and cannot be actively straightened by the patient.
Hyperextended Fingertip (DIP)
Because of the tendon imbalance, the joint near the fingertip is pulled backward into a hyperextended position.
Pain and Swelling
Following an acute injury, patients often experience significant pain, swelling, and tenderness specifically localized over the top of the middle finger joint.
Stiffness and Immobility
Over time, without proper splinting or therapy, the finger joints become incredibly stiff, and the bent deformity can become permanently fixed.
Causes and Risk Factors
Boutonnière deformity is usually caused by a traumatic injury to the extensor mechanism, but chronic conditions that weaken the tendon can also trigger the deformity.
Common causes and risk factors include:
- A forceful blow to the top of a bent middle joint
- Stubbing or jamming the finger (common in sports like basketball)
- Deep cuts or lacerations on the back of the finger
- Rheumatoid arthritis (chronic inflammation wearing out the tendon)
- Other progressive inflammatory joint diseases
- Untreated finger dislocations
Whether caused by a sudden sports injury or a chronic autoimmune condition, preserving the function of the central slip is critical to preventing permanent joint damage.
How It Is Diagnosed
Diagnosis begins with a thorough clinical evaluation of the hand. Dr. Badia evaluates the visual deformity, your symptom history, and the finger’s range of motion.
Depending on the injury, diagnostic steps may include:
- The Elson test: bending the middle joint over a table edge while trying to extend it against resistance to confirm if the central tendon is torn.
- Physical examination to test flexibility and stiffness.
- X-rays to rule out small bone fragments or avulsion fractures (where the tendon pulls a piece of bone away).
An accurate diagnosis is essential, particularly to determine if bone involvement is present, as this directly dictates whether conservative splinting will suffice or if surgery is required.
Treatment Options for Boutonnière Deformity
Treatment depends heavily on whether the injury is acute or chronic, the flexibility of the joint, and if there are associated fractures. Early intervention yields the best outcomes.
Non-Surgical Splinting
For recent injuries without bone fractures, continuous splinting is the primary approach to allow the central tendon to heal naturally:
- The PIP joint must be kept completely straight in a splint continuously for 8 weeks or more.
- The fingertip (DIP joint) is left free to perform specific exercises.
- Hand therapy is required after the splinting period to safely regain mobility and strength.
Strict compliance with the splinting protocol is vital to prevent the deformity from returning.
Expert Orthopedic Care
Dr. Alejandro Badia is a globally recognized hand and upper extremity orthopedic surgeon. He has extensive experience in performing complex hand surgeries and is known for his expertise in treating conditions like Boutonnière deformity.
Working alongside Dr. Badia, the surgical team employs advanced techniques in hand orthopedics to restore proper anatomy and function to patients suffering from severe hand conditions.
Surgical Treatment
Surgery may be necessary and is typically reserved for cases where the central tendon tears a large piece of bone away, if the deformity is caused by rheumatoid arthritis, or if the finger has developed a fixed, chronic deformity.
Surgical intervention involves repairing the disrupted central slip, pinning the joint to hold it straight, or reconstructing the extensor mechanism to correct the deformity and restore hand function.
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