Orthopaedic Surgery - Tibial Torsion

Basics

Tibial torsion describes rotational alignment of the:

Tibia

together with the:

Ankle and foot

either internally or externally around the longitudinal axis of the leg.

Some degree of tibial rotation is part of:

Normal development.

The condition becomes clinically abnormal when rotation is markedly outside the normal range for:

Age.

Definition of Abnormality

Abnormal torsion is often defined as rotational alignment greater than approximately:

Two standard deviations from the age-adjusted mean.

Classification

Tibial torsion may be classified as:

Internal tibial torsion

External tibial torsion

or

Neuromuscular tibial torsion.

Internal Tibial Torsion

Internal tibial torsion produces:

In-toeing

with the foot directed inward relative to the:

Knee.

External Tibial Torsion

External tibial torsion produces:

Out-toeing

with the foot directed outward relative to the:

Knee.

Neuromuscular Torsion

Abnormal tibial rotation may occur with neuromuscular conditions such as:

Cerebral palsy

or

Spina bifida.

Synonyms

Internal tibial torsion may be referred to as:

In-toeing

or historically:

Pigeon-toeing.

External tibial torsion produces:

Out-toeing.

Epidemiology

Abnormal tibial rotation is a common reason for:

Pediatric orthopaedic evaluation.

Age

Internal tibial torsion is most commonly noticed after the child begins:

Walking

and is especially frequent in children younger than approximately:

3 years.

Normal Development

Younger children normally have relatively greater:

Internal tibial rotation.

With growth, the tibia progressively rotates:

Externally.

Sex

No important consistent difference has been demonstrated between:

Boys and girls.

Persistence

Persistent clinically significant torsion occurs in fewer than approximately:

1–2% of children.

Genetics

Internal tibial torsion is believed to reflect a combination of:

Genetic influences

and

Intrauterine positioning.

Family History

A family history of persistent abnormal torsion may influence the likelihood of:

Spontaneous correction.

Etiology

Most idiopathic internal tibial torsion appears to result from normal developmental variation influenced by:

Genetics

and

Fetal position.

Associated Conditions

In infants, internal tibial torsion may coexist with:

Metatarsus adductus

or

Developmental genu varum.

Diagnosis

Diagnosis is primarily:

Clinical.

A careful rotational profile should assess the child from:

Hip to foot.

Signs and Symptoms

Parents commonly become concerned because the child’s walking pattern looks different from that of:

Siblings or peers.

Cosmetic Concern

The principal concern is usually:

Appearance during walking or running.

Tripping

Parents may report:

Frequent tripping

or

Falling.

In young children, however, some of this may simply reflect:

Normal motor development.

Pain

Pain is:

Unusual.

A painful gait suggests that another diagnosis should be:

Considered.

Apparent Limp

Parents may describe a limp, but uncomplicated tibial torsion usually does not produce a true:

Painful limp.

Physical Examination

Examination begins with observation of:

Standing

and

Walking.

Gait

If the child is ambulatory, observe for:

Heel-toe progression

In-toeing

Out-toeing

and

Limp.

Neurologic Warning Sign

Absence of a normal:

Heel-toe gait

may be an early clue to an underlying:

Neuromuscular disorder

such as:

Cerebral palsy.

Foot Progression Angle

The:

Foot progression angle

is the angle between the long axis of the foot and the direction in which the child is:

Walking.

Normal Foot Progression

The normal angle is usually slightly:

External

but there is a broad normal range extending approximately:

15° internally to 15° externally.

Supine Examination

Before focusing on torsion, examine the hips for:

Stability

and

Abduction.

Prone Examination

The child is then placed:

Prone

to evaluate:

Hip rotation

and

Tibial torsion.

The pelvis must remain:

Level and stationary

for accurate measurement.

Femoral Anteversion

Femoral anteversion can be estimated by determining the hip position in which the:

Greater trochanter

is most prominent laterally.

Tibial Torsion Measurement

Tibial torsion is commonly estimated using the:

Thigh-foot angle

or

Transmalleolar axis.

Thigh-Foot Angle

With the child prone and the knee flexed approximately 90°, compare the long axis of the:

Thigh

with the long axis of the:

Foot.

Internal deviation suggests:

Internal tibial torsion.

Bimalleolar Axis

The relationship between the:

Medial malleolus

Lateral malleolus

and the proximal tibia can also estimate:

Tibial rotation.

Foot Examination

The shape of the foot should be assessed carefully because:

Metatarsus adductus

may itself be responsible for:

In-toeing.

Imaging

Imaging is usually:

Not required.

The clinical rotational profile generally provides sufficient information for:

Management.

Pelvic Radiograph

An AP pelvis radiograph is appropriate when there is:

Asymmetric hip abduction

or markedly restricted:

Hip abduction.

In a toddler, abduction below approximately:

60°

raises concern for:

Developmental hip dysplasia.

Foot Radiographs

Foot radiographs may help evaluate suspected:

Metatarsus adductus

when clinical findings are unclear.

Long-Leg Radiographs

Full-length lower-extremity radiographs may be useful when there is associated:

Genu varum

or another:

Angular deformity.

CT

CT can measure tibial rotation accurately but is usually:

Unnecessary

because most childhood torsional abnormalities can be evaluated:

Clinically.

Differential Diagnosis

Important alternatives include:

Blount disease

Excessive femoral anteversion

Metatarsus adductus

Cerebral palsy

and

Developmental dysplasia of the hip.

Blount Disease

Blount disease may combine:

Pathologic genu varum

with

Internal tibial torsion.

Unlike physiologic torsion, it represents a progressive:

Growth disorder.

Femoral Anteversion

Persistent in-toeing in an older child may result from increased:

Femoral anteversion

rather than ongoing tibial torsion.

Treatment

Most cases require:

Observation and reassurance.

General Measures

Internal tibial torsion is the most common cause of in-toeing in children younger than approximately:

3 years.

Natural History

With growth, the tibia normally rotates externally so that by later childhood the:

Lateral malleolus

lies approximately:

20–30° posterior

to the:

Medial malleolus.

Spontaneous Improvement

Almost all children with idiopathic internal tibial torsion demonstrate substantial improvement by approximately:

3–5 years of age.

Parental Education

The most important intervention is often:

Explanation of the natural history.

Parents should understand that most cases improve through:

Normal growth and development.

Braces and Orthotics

Devices such as:

Night splints

Denis Browne bars

Shoe wedges

Special shoes

or

Orthotics

have not been shown to alter the natural rotational development of the:

Tibia.

External Tibial Torsion

Marked external torsion is less likely to correct spontaneously, particularly when it is:

Asymmetric.

Selected persistent cases may eventually require:

Derotational osteotomy.

Persistent In-Toeing

If in-toeing persists or becomes more obvious after approximately:

3–4 years

the cause may increasingly be:

Femoral anteversion

rather than tibial torsion.

Activity

No routine activity restriction is:

Required.

Children may participate normally in:

Play

Sports

and

Physical education.

Physical Therapy

Formal physical therapy generally does not correct:

Bony tibial rotation.

Reason Therapy Is Limited

The natural change occurs over:

Years

rather than over the shorter time frame expected from:

Therapy.

Recreational Activities

Some clinicians encourage activities requiring awareness of foot position, such as:

Ice skating

Roller skating

Track

or

Ballet.

There is little evidence that these activities directly change:

Tibial torsion.

Surgery

The only operation used to correct persistent severe tibial torsion is:

Derotational tibial osteotomy.

Timing of Surgery

Surgery is rarely considered before approximately:

8–10 years of age.

Indications

Surgery may be considered when there is:

Persistent severe rotational deformity

Functional difficulty

or major:

Cosmetic concern

after the age at which spontaneous improvement is expected.

Rotational Thresholds

Historical guidelines suggest considering osteotomy when the:

Thigh-foot angle remains internally rotated by approximately 20° or more

or when external tibial torsion measures approximately:

35° or more.

These values should be interpreted together with:

Symptoms

Function

and

Age.

Neuromuscular Patients

Children with:

Cerebral palsy

have a greater risk of recurrent torsion after:

Early surgery.

Osteotomy Level

Derotational osteotomy is often performed near the:

Distal tibial metaphysis

while avoiding injury to the:

Growth plate.

Postoperative Immobilization

The leg is commonly immobilized in a cast for approximately:

6–8 weeks.

Follow-Up

Observation may be performed:

Annually

or

Every 1–2 years

when parents desire documentation of:

Rotational improvement.

Prognosis

Tibial torsion is usually:

Self-limiting

and represents part of normal:

Childhood development.

Family Alignment

If the parents and older siblings demonstrate normal rotational alignment, spontaneous correction in the child is:

Highly likely.

Familial Persistence

A strong family history of persistent tibial torsion may slightly reduce the probability of:

Complete spontaneous correction.

Arthritis Risk

Isolated idiopathic tibial torsion in childhood has not been shown to produce a significant increased risk of:

Hip

Knee

or

Spinal arthritis.

Complications

Complications are primarily related to:

Surgical treatment.

Surgical Complications

Potential complications include:

Physeal injury

Neurovascular injury

Nonunion

Malunion

and

Implant-related problems.

Patient Monitoring

Follow-up should document:

Foot progression angle

Thigh-foot angle

Hip rotation

and overall:

Gait.

Patient Teaching

Parental education is central to management.

Most children improve naturally without:

Braces

Special shoes

or

Surgery.

Showing families how rotational alignment normally changes with age may provide useful:

Reassurance.

Frequently Asked Questions

When should my child’s tibial torsion improve?

Most children progressively improve during early childhood. Continued observation is appropriate as long as improvement is occurring. Persistent severe deformity after approximately:

8–10 years of age

may justify consideration of surgery if it is functionally or cosmetically important.

Does tibial torsion cause arthritis later in life?

Isolated developmental tibial torsion has not been convincingly shown to increase the risk of:

Hip, knee, or back arthritis.

Clinical Summary

Typical patient: Toddler with painless in-toeing noticed after beginning to walk.

Key examination: Observe gait and measure the foot progression angle and thigh-foot angle while also assessing hip rotation and foot shape.

Most important differential: Femoral anteversion, metatarsus adductus, Blount disease, hip dysplasia, and neurologic disease.

Imaging: Usually unnecessary unless the examination suggests another abnormality.

Natural history: Internal tibial torsion usually improves substantially by 3–5 years of age.

Treatment: Observation and parental reassurance; braces, special shoes, and orthotics do not alter tibial rotation.

Surgery: Rarely required and generally reserved for persistent severe deformity after about 8–10 years of age.

Key Principle

Tibial torsion is usually a developmental rotational variation of the tibia, most often presenting as:

In-toeing in toddlers.

Diagnosis is primarily:

Clinical, using gait observation and measurement of the:

Foot progression and thigh-foot angles.

Most internal tibial torsion resolves spontaneously with:

Growth, and treatment consists primarily of:

Observation and reassurance.

Bracing and special footwear have not been shown to accelerate:

Correction.

Derotational osteotomy is reserved for rare cases of:

Persistent severe symptomatic torsion in older children.