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congenital deformities overview
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Summarize the congenital deformities presentation I am a medical student. This is my start of the third, uh, third year. And I don't know anything about this. Make me understand all of this in easy way.
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congenital anomalies
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WHO congenital disorders fact sheet causes prevention diagnosis
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python -c "from pptx import Presentation; p=Presentation('/tmp/workspace/attachments/3ec2e47f-635c-4196-9281-292e98725115/congenital deformities.pptx'); print('SLIDES',len(p.slides)); [print('\\n===== SLIDE',i,'=====\\n'+'\\n'.join(sh.text for sh in s.shapes if getattr(sh,'has_text_frame',False) and sh.text.strip())) for i,s in enumerate(p.slides,1)]"
Big picture
This presentation covers five important musculoskeletal deformities seen in children:
- Developmental dysplasia of the hip, or DDH
- Congenital muscular torticollis, or CMT
- Congenital talipes equinovarus, or CTEV / clubfoot
- Sprengel deformity
- Scoliosis
A congenital deformity is an abnormality present at birth or arising during fetal development. It may be structural, such as clubfoot, or functional. Some are obvious at birth, while others become clearer as the child grows. Early recognition matters because many respond best to non-operative treatment early in life. The WHO overview of congenital disorders also emphasizes that causes are often multifactorial, involving genetic and environmental factors.
1. Developmental dysplasia of the hip: DDH
The simplest idea
DDH means the femoral head is not sitting stably and deeply inside the acetabulum.
Think of the hip as a ball in a cup:
- Ball = femoral head
- Cup = acetabulum
- In DDH, the cup may be shallow and/or the soft tissues may be lax.
- The ball may be:
- Dysplastic: shallow acetabulum, but the hip is located
- Subluxated: ball is partly out of the cup
- Dislocated: ball is fully out
The term developmental is important. A hip can be normal at birth but become unstable or dysplastic later.
Why does it happen?
There is usually no single cause. It is multifactorial:
- Female sex
- Family history
- Breech presentation
- Mechanical crowding in the uterus, for example oligohydramnios, first pregnancy, twins
- Postnatal positioning, especially tight swaddling with the hips held extended and adducted
- Associated "packaging" conditions: torticollis and metatarsus adductus
What should you look for?
In an infant, look for:
- Asymmetrical skin folds, although this alone is not diagnostic
- One leg appearing shorter
- Unequal thigh or buttock contours
- Reduced hip abduction, especially with hips flexed
- A laterally prominent greater trochanter in a dislocated hip
Key examination tests
| Test | What you do | Positive finding means |
|---|---|---|
| Ortolani test | Gently abduct the flexed hip while lifting the femur anteriorly | A dislocated hip is reduced with a palpable "clunk" |
| Barlow test | Gently adduct and apply posterior pressure to a flexed hip | A located hip is dislocatable |
| Galeazzi sign | Flex hips and knees with feet on the table, then compare knee heights | One knee is lower, suggesting femoral shortening from unilateral DDH |
| Trendelenburg sign | In an older walking child, stand on one leg | Pelvis drops on the opposite side because hip abductors are ineffective |
Memory aid:
- Barlow = push the hip out
- Ortolani = bring the hip in
Imaging
- Ultrasound is preferred in young infants, before the femoral head has ossified well.
- It can assess dynamic instability and acetabular shape.
- The slides mention Graf angles:
- Alpha angle >60 degrees is generally normal.
- A lower alpha angle suggests a shallow bony acetabulum.
- X-ray becomes more useful after about 4 to 6 months.
On an AP pelvic radiograph, remember:
- Hilgenreiner line: horizontal line through the triradiate cartilages.
- Perkins line: vertical line from the lateral acetabular edge.
- The femoral head should lie in the inferomedial quadrant.
- Shenton line: a smooth curved line formed by the inferior pubic ramus and medial femoral neck. A break suggests displacement.
- Acetabular index: reflects acetabular shallowness. A raised index suggests dysplasia.
Why does DDH matter?
Untreated DDH can lead to limp, limited abduction, leg-length discrepancy, pain, and early osteoarthritis. Early detection is valuable because early treatment can often guide the hip into normal development.
2. Congenital muscular torticollis: CMT
The simplest idea
CMT is usually caused by shortening and fibrosis of one sternocleidomastoid muscle, or SCM.
The SCM runs from behind the ear to the sternum and clavicle. If the right SCM is shortened:
- The head tilts toward the right
- The chin rotates toward the left
So, use this rule:
Head tilts toward the affected SCM and rotates away from it.
Typical presentation
- Seen in early infancy
- Head held tilted to one side with chin rotated to the other
- A firm, painless 1 to 3 cm SCM mass may be felt at 1 to 4 weeks of age
- Restricted neck movement
- Sometimes associated with difficult delivery or birth trauma
- Frequently associated with DDH, so a baby with CMT should have the hips examined carefully.
What happens if it persists?
Persistent asymmetrical positioning can cause:
- Plagiocephaly: flattening of one side of the skull
- Facial asymmetry
- Secondary cervical scoliosis
Important differential diagnoses
Do not assume every child with a tilted neck has simple muscular torticollis.
- Klippel-Feil syndrome: congenital fusion of cervical vertebrae
- Short neck
- Low hairline
- Restricted neck movements
- Grisel syndrome: non-traumatic atlantoaxial subluxation after head-and-neck infection or ENT surgery
- Torticollis plus neck pain and infectious symptoms
- Can produce neurological complications
- Other considerations: ocular torticollis, neurological disease, cervical spine lesion, infection, tumor, or trauma.
Clinical lesson: painless CMT in a well infant is different from a child with painful torticollis, fever, or neurological deficits. The latter needs urgent assessment.
3. Congenital talipes equinovarus: CTEV, or clubfoot
The simplest idea
Clubfoot is a deformity in which the foot points downward and inward.
It is not just "a turned-in foot." It is a fixed combination of deformities.
The four parts: CAVE
Use the mnemonic CAVE:
- Cavus: high medial arch
- Adductus: forefoot points inward
- Varus: heel turns inward
- Equinus: ankle is plantar-flexed, meaning the foot points downward
So, CAVE = clubfoot.
Anatomic breakdown
| Region | Deformity |
|---|---|
| Hindfoot | Equinus and varus |
| Forefoot | Adduction and supination |
| Midfoot | Cavus |
Typical examination findings
- Short, tight Achilles tendon
- Small high heel
- Deep medial or plantar skin crease
- No normal posterior heel crease
- Foot may be smaller than the opposite side in unilateral disease
- Calf muscle wasting on the affected side
- Internal tibial torsion may coexist
- Callosities may develop over abnormal pressure points if the child walks on the deformed foot
Important point
A clubfoot should be assessed for whether it is:
- Idiopathic: isolated, most common
- Syndromic or neurogenic: associated with conditions such as arthrogryposis or spina bifida
Arthrogryposis
Arthrogryposis means congenital contractures in two or more body areas due to abnormal muscle development and fibrosis. Clubfoot in arthrogryposis is often more rigid and is part of a broader systemic pattern.
Imaging
X-rays are usually not needed to make the diagnosis in a newborn because clubfoot is mainly a clinical diagnosis. Imaging may document the deformity or help in atypical cases.
4. Sprengel deformity
The simplest idea
Sprengel deformity is a congenitally elevated scapula.
During normal embryological development, the scapula starts high in the neck region and descends to the upper back. In Sprengel deformity, this descent is incomplete.
Clinical features
- One shoulder sits higher than the other
- Scapula is small, high-riding, and medially rotated
- Scapular winging or hypoplasia may be present
- The medial border may appear short or abnormal
- Limited shoulder abduction, because normal scapulothoracic movement is restricted
- Forward flexion can also be limited
Associations
It can occur with other skeletal anomalies, especially:
- Klippel-Feil syndrome
- Hemivertebrae
- Rib anomalies or fusion
- Scoliosis
- Other limb deformities
X-ray confirms a high and medially rotated scapula.
5. Scoliosis
The simplest idea
Scoliosis is a three-dimensional spinal deformity, not just a sideways bend.
It includes:
- Lateral curvature in the coronal plane
- Vertebral rotation
- Sometimes altered thoracic kyphosis or lumbar lordosis
The rotation creates the rib hump seen when a patient bends forward.
Types of scoliosis
| Type | Meaning / example |
|---|---|
| Idiopathic | No known cause. Most common, especially adolescent idiopathic scoliosis |
| Congenital | Due to abnormal vertebral formation or segmentation, such as hemivertebra or fused ribs |
| Neuromuscular | Caused by muscle or nerve disorders, for example cerebral palsy |
| Syndromic | Associated with Marfan syndrome, neurofibromatosis, and others |
| Static / functional | Due to factors such as leg-length discrepancy. It is usually non-structural |
Structural vs non-structural
- Structural scoliosis: fixed curve with vertebral rotation. It does not fully correct on bending.
- Non-structural scoliosis: flexible compensatory curve. It may correct when the underlying issue, such as leg-length discrepancy, is corrected.
How curves are named
A curve is named according to its apex, the vertebra furthest from the midline:
- Cervical
- Cervicothoracic
- Thoracic
- Thoracolumbar
- Lumbar
Examination
Look at the patient from behind:
- Shoulder height asymmetry
- Unequal scapular prominence
- Unequal waist or arm-trunk spaces
- Pelvic obliquity and leg-length discrepancy
- Trunk shift
- Rib hump
- Skin findings, especially café-au-lait spots, which can suggest neurofibromatosis
Adam forward-bend test
Ask the patient to bend forward with knees straight and arms hanging down.
- A rib hump or lumbar prominence indicates vertebral rotation and supports a structural scoliosis.
- This is a screening test, not the final diagnosis.
X-ray and Cobb angle
The standard measurement is the Cobb angle:
- Identify the most tilted vertebra above the curve.
- Identify the most tilted vertebra below the curve.
- Draw lines along their endplates.
- Draw perpendiculars to those lines.
- The angle between the perpendiculars is the Cobb angle.
The presentation uses this severity classification:
| Degree | Cobb angle |
|---|---|
| Grade 1 | 5 to 10 degrees |
| Grade 2 | 11 to 25 degrees |
| Grade 3 | 26 to 50 degrees |
| Grade 4 | More than 50 degrees |
Who is most likely to progress?
Progression depends mainly on three factors:
- Sex: girls have a higher risk of clinically important progression.
- Growth remaining: a child who has much more growth ahead has greater risk.
- Curve size: larger curves at diagnosis are more likely to progress.
Skeletal maturity is assessed with:
- Triradiate cartilage: its fusion indicates advancing maturity.
- Risser sign: iliac apophysis ossification gives an estimate of remaining growth.
Red flags in scoliosis
Idiopathic scoliosis is usually painless. Investigate carefully if there is:
- Severe, persistent, or night pain
- Neurological signs
- Very young age at onset
- Rapid progression
- A left thoracic curve
- Abnormal skin signs or features of a syndrome
These features raise concern for congenital, neurological, infectious, tumor-related, or other non-idiopathic causes.
How these conditions connect
These are not random topics. They teach a common pediatric orthopaedic approach:
- Recognize the deformity early.
- Decide whether it is isolated or part of a syndrome.
- Examine for associated abnormalities.
- Use age-appropriate imaging.
- Identify which children are at risk of progression or long-term disability.
Examples:
- CMT is associated with DDH.
- Sprengel deformity may occur with Klippel-Feil syndrome and scoliosis.
- Clubfoot may be isolated or part of arthrogryposis.
- Congenital scoliosis may occur with vertebral and rib malformations.
One-minute revision sheet
-
DDH: unstable hip due to shallow acetabulum/capsular laxity. Risk factors: female, breech, family history.
Barlow pushes out; Ortolani reduces in. -
CMT: shortened SCM.
Head tilts toward the affected side, chin points away. Check hips for DDH. -
CTEV / clubfoot: fixed downward and inward foot.
CAVE: Cavus, Adductus, Varus, Equinus. -
Sprengel deformity: elevated, medially rotated scapula due to failed embryological descent. Think of associated cervical-spine abnormalities.
-
Scoliosis: lateral spinal curve plus rotation.
Assess with Adam forward-bend test and measure on X-ray with the Cobb angle. Progression risk rises with female sex, larger curve, and remaining growth.
A recent systematic review confirms that congenital anomalies remain a major global health burden, though it does not change the clinical principles in this presentation (PMID 39905325).
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