Orthopaedic Surgery - Camptodactyly

Basics

Camptodactyly is a nontraumatic flexion deformity of the proximal interphalangeal (PIP) joint that may gradually progress over time.

It most commonly involves the little finger, although one or more adjacent fingers may occasionally be affected.

The condition may occur in isolation or as part of a recognized congenital or genetic syndrome.

Types of Camptodactyly

Two main clinical patterns are recognized: early-onset and delayed-onset camptodactyly.

The early form develops during the first year of life and is the more common type.

It affects males and females approximately equally.

The delayed or late form usually begins after approximately 10 years of age and occurs predominantly in girls.

Terminology

The two patterns have sometimes been described as congenital and adolescent camptodactyly.

However, some clinicians prefer the terms early and delayed or late camptodactyly because both forms probably represent variations of the same underlying disorder rather than completely separate diseases.

Importance of Age at Treatment

Treatment generally produces the best results when initiated during childhood or adolescence.

Once the deformity becomes longstanding and fixed in adulthood, correction is much more difficult and the results of treatment are generally poor.

Epidemiology

Camptodactyly is uncommon and affects less than 1% of the population.

Risk Factors

A positive family history increases the likelihood of developing the condition.

However, many affected patients have no known relatives with camptodactyly.

Genetics

Many cases occur sporadically.

Familial cases may demonstrate autosomal dominant inheritance, although expression and severity can vary considerably among family members.

Pathophysiology

The precise structural abnormality responsible for camptodactyly is variable.

Almost every soft-tissue structure capable of producing PIP flexion has been implicated.

The final deformity results from an imbalance between the flexor and extensor mechanisms of the PIP joint.

Lumbrical Abnormalities

Abnormalities of the lumbrical muscle may include absence, atrophy, or an abnormal insertion into the lumbrical canal.

These abnormalities can alter the balance of forces across the PIP joint and contribute to progressive flexion.

Flexor Tendon Abnormalities

A fibrous band may arise from the A1 pulley and insert into the flexor digitorum superficialis tendon.

The flexor digitorum superficialis may also have an abnormal origin from the palmar fascia.

Other abnormalities include anomalous tendons and a relatively short flexor digitorum profundus.

Capsular and Ligamentous Abnormalities

Contracture of the collateral ligaments or volar plate may develop as the deformity progresses.

These secondary changes make the PIP joint increasingly stiff and can convert an initially flexible deformity into a fixed contracture.

Etiology

Camptodactyly is thought to result from disturbed balance between the flexor and extensor mechanisms at the PIP joint.

Frequently identified anatomical abnormalities include unusual insertions or relationships of the lumbrical muscle, flexor digitorum superficialis, and retinacular ligamentous structures.

Because the anatomic cause differs among patients, no single treatment is successful in every case.

Associated Conditions

Camptodactyly may occur as part of several syndromes and congenital disorders.

Reported associations include trisomy 13–15, oculodentodigital syndrome, orofaciodigital syndrome, Aarskog syndrome, cerebrohepatorenal syndrome, mucopolysaccharidosis, osteo-onychodysostosis, and Jacob-Downey syndrome.

Diagnosis

Signs and Symptoms

The characteristic finding is a flexion deformity of the PIP joint, most commonly affecting the little finger.

Adjacent fingers may occasionally demonstrate similar involvement.

Pain and swelling are usually absent, even when the contracture is severe.

Bilateral Involvement

Approximately two-thirds of patients have involvement of both hands.

The degree of deformity does not necessarily match from side to side.

When only one hand is affected, the right hand is more commonly involved.

Position of the MCP Joint

The metacarpophalangeal joint is often held in slight hyperextension.

This compensatory posture may partially offset the functional effect of PIP flexion.

For this reason, relatively mild contractures can be well tolerated.

Effect of Wrist Position

In children, the deformity may become less pronounced or temporarily disappear when the wrist is flexed.

This finding reflects the dynamic relationship between the flexor tendons and PIP joint position.

Severe Deformity

In more advanced cases, the finger may also develop a rotational component.

The patient may complain that the digit interferes with gripping, typing, tapping, or other fine hand activities.

Camptodactyly Versus Clinodactyly

Camptodactyly should not be confused with clinodactyly.

Camptodactyly describes a flexion deformity in the sagittal plane at the PIP joint.

Clinodactyly refers to angular deviation of a digit in the radioulnar plane.

Physical Examination

Active and passive motion of the PIP and MCP joints should be carefully measured.

The examination should be performed with the wrist in both flexion and extension.

This helps determine how much of the deformity is dynamic and how much represents a fixed contracture.

Flexible Versus Fixed Deformity

An important part of the examination is determining whether the PIP contracture can be corrected passively.

A flexible deformity is more likely to respond to splinting and stretching.

A fixed contracture suggests established soft-tissue or joint changes and has a less favorable prognosis.

Imaging

Plain Radiographs

Plain radiographs of the involved digit should be obtained, particularly when the deformity is longstanding or severe.

Early in the condition, radiographs may be relatively normal.

Structural changes can develop with growth and prolonged contracture.

Radiographic Changes

Longstanding camptodactyly may produce broadening of the base of the middle phalanx.

The neck of the proximal phalanx may become indented, giving the proximal phalangeal head a characteristic beaked appearance.

Advanced Joint Changes

Other radiographic abnormalities may include narrowing of the PIP joint space, dorsal flattening of the proximal phalangeal condyle, flattening of the palmar surface, and volar subluxation of the middle phalanx.

These structural changes indicate a more established deformity and reduce the likelihood of achieving complete correction.

Differential Diagnosis

Diagnosis is based primarily on a careful history and physical examination.

The differential diagnosis includes clinodactyly, post-traumatic deformity, Dupuytren contracture, arthrogryposis, absence or hypoplasia of an extensor tendon, Marfan syndrome, Beals syndrome or congenital contractural arachnodactyly, pterygium syndrome, symphalangism, and boutonniere deformity.

Treatment

General Principles

There is no single universally successful treatment because camptodactyly can arise from several different anatomical abnormalities.

The goal is to restore or improve the balance between the flexor and extensor mechanisms while maintaining useful joint motion.

Early-Onset Camptodactyly

In early-onset disease, the preferred initial treatment is generally progressive extension splinting.

Because younger patients often have flexible soft tissues and less-established joint deformity, conservative treatment can be particularly effective.

Delayed-Onset Camptodactyly

Delayed or adolescent camptodactyly is also initially treated conservatively.

Surgery may be considered if the deformity is severe, progressive, functionally limiting, or fails to respond to splinting.

Mild Contractures

A PIP flexion contracture of less than approximately 30–40° often causes little functional impairment.

Compensatory hyperextension at the MCP joint allows many patients to use the hand normally.

In such cases, observation and acceptance of the deformity are often preferable to surgery.

Counseling

Patients and families should be informed that operative results can be unpredictable.

For mild deformities, many surgeons recommend accepting the appearance rather than risking increased stiffness or pain from surgery.

Splinting

Splinting is the mainstay of conservative treatment.

Static extension splints, often worn at night, can help maintain or improve PIP extension.

Progressive splinting is especially effective when the deformity remains flexible.

Serial Casting

Serial plaster casting may be used when splinting alone does not provide sufficient correction.

The PIP joint is gradually brought toward extension over a series of casts.

Casting should generally be attempted before operative treatment.

Occupational Therapy

Occupational or hand therapy may be helpful in both early and delayed forms.

The therapist can supervise stretching, splint fabrication, skin care, and progressive range-of-motion exercises.

Night splinting is often recommended to reduce progression.

Indications for Surgery

Surgery is generally reserved for severe and progressive deformity, especially when the flexion contracture exceeds approximately 60° and causes functional limitation or significant unacceptable deformity.

Operative intervention may also be considered to prevent progressive, irreversible articular changes in carefully selected patients.

Patient Selection for Surgery

Surgical candidates should be chosen carefully.

The best candidates are younger patients with deformities that remain at least partially correctable and have a clearly defined anatomical cause.

A treatment plan should be tailored to the clinical examination rather than applying a single operation to every patient.

Surgical Goals

Surgery attempts to correct the abnormal anatomy by releasing, lengthening, or transferring abnormal muscle, tendon, capsular, or ligamentous structures.

Because multiple abnormalities may coexist, procedures are often performed in a stepwise fashion.

Soft-Tissue Release

Severe deformities may require release of contracted skin and soft tissues.

Local flap coverage may occasionally be needed when correction creates a skin deficit.

Flexor Digitorum Superficialis Tenotomy

When the flexor digitorum superficialis contributes significantly to the contracture, tenotomy or lengthening may be performed.

This reduces the abnormal flexion force across the PIP joint.

Volar Plate Release

A contracted volar plate can prevent full PIP extension.

A sliding or formal volar plate release may be incorporated into surgical correction when capsular contracture is present.

Extensor Mechanism Rebalancing

Residual extension lag may require procedures aimed at restoring the balance of the extensor mechanism.

These procedures can include tendon transfers or adjustments of the central slip and lateral bands.

Fowler Tenotomy

In selected severe cases, a Fowler-type tenotomy may be used as part of extensor mechanism rebalancing.

The procedure alters the relationship between the central slip and lateral bands to improve extension forces across the PIP joint.

Tendon Transfer

Tendon transfer may be considered particularly in adolescent camptodactyly when an abnormal tendon or muscular imbalance is a major contributor.

The goal is to redirect force and improve active PIP extension.

Corrective Osteotomy

If radiographs demonstrate established bony deformity or joint remodeling, a procedure aimed solely at increasing joint motion may be ineffective.

In these cases, a corrective extension osteotomy may provide better alignment.

PIP Arthrodesis

When the PIP joint is severely damaged, deformed, painful, or no longer salvageable, PIP joint arthrodesis may be considered.

Fusion sacrifices motion but can provide a stable finger positioned in a more functional alignment.

Surgery in Adults

Corrective surgery initiated in adulthood generally produces poor results.

Adult patients are at greater risk of increased stiffness and pain after intervention.

For this reason, routine reconstructive surgery in adults is generally discouraged unless there is a compelling functional indication.

Follow-Up

Camptodactyly should be monitored throughout growth because progression is common during childhood and adolescence.

The degree of PIP contracture, passive correctability, hand function, and radiographic changes should be followed over time.

Prognosis

Without treatment, approximately 80% of cases may progressively worsen.

Progression is particularly common during periods of rapid skeletal growth.

Growth Spurts

The deformity often becomes more noticeable during growth spurts, when abnormal soft-tissue structures fail to lengthen at the same rate as the skeleton.

This is why periodic reassessment during childhood and adolescence is important.

Natural History After Maturity

Progression usually slows or stops after approximately 18–20 years of age, once skeletal growth is complete.

However, any fixed contracture present at maturity may persist permanently.

Complications

Surgery, particularly in adults or patients with longstanding fixed deformity, can lead to increased PIP stiffness and pain.

Other potential problems include incomplete correction, recurrence, scarring, or reduced active motion.

Patient Monitoring

Because younger patients have the greatest potential for successful treatment, early recognition and continued monitoring are important.

The deformity should be reassessed during periods of growth for increasing contracture or functional limitation.

Patient Teaching

Patients and families should inspect the skin regularly when splints are being used.

Pressure areas, redness, or skin breakdown should prompt adjustment of the splint.

Stretching should continue after completion of casting or intensive splinting to preserve the correction achieved.

Activity

Most patients require no activity restrictions.

Mild deformity usually does not interfere significantly with daily life, sports, or school activities.

Severe contracture may interfere with occupations, sports, or tasks requiring precise fine-motor hand function.

Prevention

There is no established method for preventing camptodactyly.

Early identification and treatment may, however, reduce progression and secondary joint deformity.

Frequently Asked Question: How Often Are Both Hands Involved?

Camptodactyly is bilateral in approximately two-thirds of patients.

The little finger is the most commonly affected digit, although adjacent fingers may also be involved.

Frequently Asked Question: Is Surgery Usually Recommended?

No. Mild contractures of less than approximately 30–40° generally cause little functional impairment and are usually treated nonoperatively.

Because surgical results are variable, surgery is generally reserved for severe, progressive deformities that interfere with function or produce major unacceptable deformity.

Stretching should be continued after the splinting or casting program to maintain the gain achieved  Activity Generally, no limitations are placed on activity

In severe cases, the deformity may pose a problem in sports or occupations requiring fine work with the hands  Prevention No effective means of prevention exists  FAQ Q: How often does camptodactyly affect both hands?

A: It is bilateral in 2/3 of cases; the 5th finger is most commonly involved. Q: Is surgery recommended to correct the deformity?  A: Mild contracture (<30–40°) does not interfere with function and should be treated nonoperatively. Surgical results are not consistent, and surgery usually is reserved for more severe cases that hinder activity.