Middle joint bending backwards
The PIP joint over-straightens when the finger is held out.
Extensor imbalance · Finger deformity
Swan-Neck Deformity Symptoms & Treatment
A middle finger joint that bends backwards while the fingertip stays bent can follow an untreated mallet finger, a joint injury or inflammatory arthritis. Early assessment can often correct a flexible deformity with a splint before it becomes stiff.
Middle joint bends backBent fingertipSnapping when bendingPrevious mallet finger
Patient guideSymptoms → Diagnosis → Treatment → Recovery
Specialist hand & wrist assessment
What is it?
The middle (PIP) joint over-straightens and the fingertip (DIP) joint stays bent.
Early treatment
A small splint that stops the middle joint bending backwards, and treating any mallet finger.
Why act early?
A flexible deformity is generally easier to correct than a stiff, fixed one.
When surgery?
Troublesome snapping, failed splinting, rheumatoid disease or a fixed, painful joint.
Understanding the condition
What is a swan-neck deformity?
Finger movement depends on a fine balance between the tendons and ligaments around each joint. In a swan-neck deformity that balance is lost: the proximal interphalangeal (PIP) joint over-straightens (hyperextends) while the distal interphalangeal (DIP) joint at the fingertip stays bent. It is closely related to mallet finger and is, in effect, the opposite posture to a swan-neck deformity.
Early on the finger may simply feel as if it catches or snaps as it starts to bend. Over time, especially with arthritis, the joint can become stiff and harder to correct.
Clear diagnosis before treatmentSimilar symptoms can arise from the neck, elbow, wrist, tendons or joints. The examination is designed to locate the true source.
What patients may notice
Symptoms worth checking early.
Symptoms vary with the tendon or finger structure involved and how long function has been affected. Persistent locking, weakness, deformity or loss of movement deserves specialist assessment.
Bent fingertip
The DIP joint rests in a bent position and may not straighten fully.
Snapping or catching
The finger may catch or snap as it begins to bend into a fist.
Difficulty gripping
Starting to bend the finger around small objects can be awkward.
Stiffness
A long-standing deformity may no longer correct fully with passive movement.
Associated arthritis
Rheumatoid or other inflammatory arthritis can cause swelling, pain and progressive deformity.
Why it happens
What causes swan-neck deformity?
A useful consultation connects the symptom pattern to the exact tendon, pulley or joint involved—not just the label.
Untreated mallet finger
Loss of the tendon at the fingertip can shift the pull of the extensor tendon to the middle joint.
Volar plate injury
A hyperextension injury can loosen the ligament that stops the middle joint bending backwards.
Inflammatory arthritis
Rheumatoid arthritis can weaken ligaments and tighten the small muscles of the hand.
Joint laxity or muscle imbalance
Naturally lax joints, or conditions affecting muscle tone, can also contribute.
Focused diagnosis
Find the structure, the injury and the severity.
Assessment identifies what started the imbalance, whether the deformity is still flexible and whether arthritis or joint damage is present.
Bring to your appointmentPrevious reports, imaging, operation notes, splints and information about work or activities that trigger symptoms.
Injury and deformity history
Timing, mechanism and progression are documented.
Joint position and flexibility
Active and passive PIP and DIP movement are compared.
Tendon and ligament balance
Examination checks for mallet finger, volar plate laxity and tightness of the small hand muscles.
X-ray
Imaging checks for fracture, joint alignment and arthritis.
Treatment choices
Start with the option that fits the diagnosis.
Surgery is not automatic. Treatment is matched to the exact tendon or finger problem, symptom severity, function and the patient’s goals.
Non-surgical care
Reduce irritation, protect function and review progress.
- Anti-hyperextension splintA small figure-of-eight or ring splint stops the middle joint bending backwards while allowing the finger to bend.
- Treat a mallet fingerIf a mallet finger is the cause, fingertip splinting may help restore balance.
- Hand therapyExercises and splint adjustment help control snapping and improve grip.
- Activity advicePractical changes can reduce strain on the finger while treatment takes effect.
- Arthritis managementInflammatory disease may need medication and rheumatology input as well as splinting.
Surgical pathway
Restore tendon balance when the deformity cannot be corrected with splinting.
- Soft-tissue rebalancingProcedures that tighten the front of the middle joint or rebalance the tendons for a flexible deformity.
- Correcting the mallet fingerTreating the fingertip tendon problem when it is driving the deformity.
- Releasing tight structuresA stiffer deformity may need tight tissues released before correction.
- Joint procedure in advanced casesSevere painful arthritis may be treated with joint fusion or joint replacement.
Surgery when appropriate
Swan-neck deformity surgery
Non-surgical treatment is usually tried first, particularly when the deformity is flexible. Surgery is considered when snapping or deformity continues to affect function despite splinting, or when the joint is stiff or badly affected by arthritis.
- Assess flexibility, the cause and the joint condition
- Choose soft-tissue, tendon or joint surgery to fit the problem
- Rebalance the finger so the middle joint no longer bends backwards
- Protect the repair with a splint
- Progress hand therapy to restore movement and grip
Realistic expectationsSurgery can reduce snapping and improve alignment and grip, but may not make a long-standing finger look completely normal. Stiffness or recurrence remain possible.
Specialist pathwayDiagnosis → Procedure → Therapy → Recovery
Recovery pathway
Healing is staged—not rushed.
Timelines are guides only. The diagnosis, procedure, wound, therapy programme, job and associated injuries all influence recovery.
First weeks
After surgery, the finger is usually protected in a splint while it heals.
Early therapy
Movement is introduced gradually under hand-therapy guidance.
Building strength
Grip and everyday use are increased as the repair strengthens.
Longer term
Movement and strength can keep improving for several months; arthritis-related cases may recover more slowly.
4.96/555 verified reviewsWhy consult Dr Arshad
A clear diagnosis. Practical options. A plan built around you.
Dr Shoaib Arshad is a fellowship-trained consultant orthopaedic hand and wrist surgeon with UK specialist training and more than 17 years in orthopaedic surgery.
Focused hand, wrist and upper-limb assessmentNon-surgical and surgical treatment pathwaysPrivate consultations at The Highfield Hospital, Rochdale, for patients across Greater Manchester and the North West
Meet Dr Arshad ↗Questions patients ask
Swan-Neck Deformity FAQs.
General information only. Your diagnosis and treatment plan should be based on an individual medical assessment.
Is swan-neck deformity related to mallet finger?+
It can be. An untreated mallet finger can shift the pull of the extensor tendon to the middle joint, which gradually bends backwards.
Will a splint fix it?+
A splint that stops the middle joint bending backwards often helps a flexible deformity, especially if worn as advised.
Can a long-standing deformity still be treated?+
Yes, but fixed deformities are more complex. Treatment depends on how flexible the finger is and the condition of the joint.
Does surgery make the finger completely normal?+
Not always. Surgery aims to improve function, alignment and pain, but stiffness or residual deformity may remain.
Where does Dr Arshad see patients?+
Dr Arshad sees private patients at The Highfield Hospital, Manchester Road, Rochdale OL11 4LZ — within easy reach of Manchester, Oldham, Bury, Bolton and the wider North West. Call +44 7443 213645 or send an enquiry and the team will confirm an appointment.
Medical referencesPatient information sources used for this guide
The Highfield Hospital · Rochdale, Greater Manchester
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